1
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
General Description
The AAT2400/2401 is a highly integrated, high efficiency
white LED backlight solution for large size LCD panels
used in LCD TVs. To accommodate power requirements,
the solution consists of two devices, a master device
(AAT2400) and a slave device (AAT2401). The devices
operate from a regulated 24V DC power supply. The
master device supplies a 40V rail to drive 10 series LEDs
with a typical VF of 3.6V. 16 precision current sinks split
evenly between the master and slave devices provide
constant current drive for up to 160 white LEDs.
A SPI compatible interface operates up to 30MHz, allow-
ing fast, independent digital control of each current sink.
Full scale LED current is programmed from 30mA to
100mA using an external resistor. LED brightness varia-
tion is compensated by setting relative current sink mag-
nitudes with an 8-Bit Dot Correction register for each
LED current sink.
The AAT2400/2401 provides a 12-bit programmable
phase delay per LED current sink that can be used to
synchronize the LEDs to VSYNC. Device addressing pro-
vides for up to 256 LED strings. A 12-bit programmable
Gray Scale PWM brightness setting is generated via a
clock from a PLL synchronized to VSYNC, or from the
external GSCLK pin.
The AAT2400/2401 provides fault handling and fault
reporting through the interface. If LEDs are shorted on
one or more strings, the current sinks will maintain
operation due to the high voltage rating of the outputs.
However, a fault condition will be reported on the open
drain Fault pin. Similarly, if an open circuit is detected or
an over-temperature condition arises, the fault is report-
ed on the Fault pin. When a fault is reported, the nature
of the fault condition can be read through the serial
interface.
The AAT2400 boost converter provides an output voltage
regulated by the string with the highest voltage require-
ment allowing a wide range of LED characteristics, while
maintaining the lowest possible power dissipation. The
boost switching frequency is 600kHz to allow for opti-
mum efficiency with the smallest external filter.
Alternatively, the device may be synchronized to an
external clock. Current mode control provides fast
response to line and load transients. Thermal protection
circuitry shuts down the boost converter and the current
sinks in the event of an over-temperature condition.
The AAT2400 and AAT2401 are available in Pb-free, ther-
mally enhanced 36-pin 5x5mm TQFN packages.
Features
•VIN Range: 10.8V – 28V
•Integrated Boost Converter
▪ VOUT(MAX): 40V
▪ IOUT(MAX): 1.6A
•Up to 95% Efficiency
•Switching Frequency Options
▪ 600 kHz
▪ Sync to External Clock (optional)
•16 LED Current Sinks up to 100mA/ch
▪ ±2.5% Accuracy (60mA)
▪ ±2.0% Matching (60mA)
•SPI Interface
▪ Digitally Programmable Individual Channels
▪ Up to 30MHz Clock Speed
▪ Read/Write Registers
•Precision PWM Digital Brightness Control
▪ 12-bit Individual Gray Scale PWM Brightness
▪ 12-bit Individual Channel Phase Delay
▪ 8-bit Individual Current Setting (Dot Correction)
▪ VSYNC Derived Internal Oscillator
•VSYNC PWM and Delay Synchronization
•Device Addressing
▪ 16 Possible Address Settings
▪ Up to 256 Current Sinks
•Fault Reporting
•Integrated Fault Protection
▪ Open/Short LED(s)
▪ Current Limit Protection
▪ Over-Voltage Protection
▪ Over-Temperature Protection
•Soft-Start to Minimize Inrush Current
•TQFN55-36 Low Profile Package
•-40°C to +85°C Temperature Range
Applications
• Large Size LCD TV, Panels
• White LED Backlight
2
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Typical Application Circuit
CSFBO
CS9
CS10
CS11
CS12
CS13
CS14
CS15
CS16
SDI
SCLK
RSET
SPI
VSYNC
GSCLK
R7
CS
SDO
ADDR0
ADDR1
FAULT
2K
VCC
VIN 24V
2.2µF
4.7µF
VIN
VCC
EN
LX
12.1K
OVP
D1
60V 3A
VIN 24V
AAT2400
AAT2401
2k
18nF
442K
CS1
CS2
CS3
CS4
CS5
CS6
CS7
CS8
L1
10µH VOUT
COMP
SDI
SCLK
SYNC
4.7µ
F
50V
PGND SGND
RSET
SPI
VIN
2.2µF
VCC
AGND
VSYNC
GSCLK
R1
EN
CS
SDO
ADDR0
ADDR1
4.7µF
CSFB
FAULT
2K
VCC
0.68µF
PLL
0.68µF
PLL
DGND
PGND SGNDAGND DGND
10µF
12.1K
10µF
12.1K
OVP
2.2µF
VCCIO
VCCIO
2.2µF
10K
CSFBI
3
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
1. Unused current sink channels must be terminated. Refer to the Channel Disable paragraph in the Application Information section of this datasheet.
AAT2400 Pin Descriptions
Pin # Symbol Function Description
1 CS5 O Output current sink 51.
2 CS6 O Output current sink 61.
3 CS7 O Output current sink 71.
4 CS8 O Output current sink 81.
5 SGND GND Current sink ground. Connect to GND as closely as possible to the device.
6 CS4 O Output current sink 41.
7 CS3 O Output current sink 31.
8 CS2 O Output current sink 21.
9 CS1 O Output current sink 11.
10 RSET I Resistor for setting maximum current sink DC level. Connect a resistor between this pin and
AGND pin.
11 EN I Logic high enable pin. Apply a logic high voltage after power is applied to VIN or connect to VIN
through a RC time delay network to enable the device.
12 FAULT O Open drain fault signal. Pull up to logic supply with external resistor.
13 PLL I/O PLL compensation. Connect associated network between this pin and AGND.
14, 32 AGND GND Analog ground. Connect to GND with one single connection.
15 DGND GND Digital ground. Connect to GND as closely as possible to the device.
16 VIN I IC and boost converter power supply.
17 VCC I/O Internally regulated power supply. Decouple with 2.2µF/6.3V capacitor to AGND.
18 VCCIO I/O Internally regulated power supply (3.3V) for SDO. Decouple with 2.2µF/6.3V capacitor to
DGND.
19 SDO O SPI interface serial data output.
20 COMP I Boost converter compensation. Connect external resistor and capacitor to this pin and AGND.
21 CSFB I Current sink feedback. Connect to slave device CSFBO with a 10kΩ pull-down resistor.
22 SYNC I Connect to an external clock for synchronization Connect to PGND if not used.
23 N/C No connect
24, 25 LX O Switching node of boost converter. Connect a 10µH inductor between this pin and VIN. Connect
a Schottky diode between this pin and the boost output capacitor.
26, 27 PGND GND Power ground of boost converter integrated NMOS switching device. Boost output capacitor
must be placed very close to this pin.
28 ADDR1 I MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
29 ADDR0 I LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
30 VSYNC I Vertical sync. PWM operation synchronization and reset.
31 GSCLK I PWM clock. Apply clock or connect to GND if not used.
33 SCLK I SPI interface serial clock.
34 SDI I SPI interface serial data input.
35 CSB I SPI interface active low chip select.
36 OVP I Over-voltage protection pin. Connect resistive divider between VOUT and GND.
EP Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain accept-
able junction temperature.
4
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
1. Unused current sink channels must be terminated. Refer to the Channel Disable paragraph in the Application Information section of this datasheet.
AAT2401 Pin Descriptions
Pin # Symbol Function Description
1 CS5 O Output current sink 51.
2 CS6 O Output current sink 61.
3 CS7 O Output current sink 71.
4 CS8 O Output current sink 81.
5 SGND GND Current sink ground. Connect to GND as closely as possible to the device.
6 CS4 O Output current sink 41.
7 CS3 O Output current sink 31.
8 CS2 O Output current sink 21.
9 CS1 O Output current sink 11.
10 RSET I Resistor for setting maximum current sink DC level. Connect a resistor between this pin
and AGND pin.
11 EN I Logic high enable pin. Apply a logic high voltage after power is applied to the VIN. Or con-
nect to VIN through a RC time delay network to enable the device.
12 FAULT O Open drain fault signal. Pull up to logic supply with external resistor.
13 PLL I/O PLL compensation. Connect associated network between this pin and AGND.
14, 32 AGND GND Analog ground. Connect to GND with one single connection.
15 DGND GND Digital ground. Connect to GND as closely as possible to the device.
16 VIN I IC and boost converter power supply.
17 VCC I/O Internally regulated power supply. Decouple with 2.2µF/6.3V capacitor to AGND.
18 VCCIO I/O Internally regulated power supply (3.3V) for SDO. Decouple with 2.2µF/6.3V capacitor to
DGND.
19 SDO O SPI interface serial data output.
20, 22, 24,
25, 26, 27 AGND GND Connect to GND with one single connection.
21 CSFBO O Current sink feedback output. Connect to master device CSFB with a 10kΩ pull-down
resistor
23 CSFBI I Current sense feedback input. Connect to VCC if not used.
28 ADDR1 I MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
29 ADDR0 I LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
30 VSYNC I Vertical sync. PWM operation synchronization and reset.
31 GSCLK I PWM clock. Apply clock or connect to GND if not used.
33 SCLK I SPI interface serial clock.
34 SDI I SPI interface serial data input.
35 CSB I SPI interface active low chip select.
36 OVP I Over-voltage protection pin. Connect resistive divider between VOUT and GND.
EP Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain ac-
ceptable junction temperature.
5
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 23mW/°C above 25°C.
Pin Configuration
AAT2400 AAT2401
TQFN55-36 TQFN55-36
(Top View) (Top View)
1
2
3
4
5
6
36 35 34 33 32 28
10 11 12 13 14 15
27
26
25
24
23
22
CS5
CS6
CS7
CS8
SGND
CS4
RSET
EN
FAULT
PLL
AGND
DGND
LX
LX
N/C
SYNC
PGND
PGND
AGND
ADDR1
SCLK
SDI
CSB
OVP
31 30 29
ADDR0
VSYNC
GSCLK
16 17 18
VIN
VCC
VCCIO
21
20
19
CSFB
COMP
SDO
7
8
9
CS3
CS2
CS1
1
2
3
4
5
6
36 35 34 33 32 28
10 11 12 13 14 15
27
26
25
24
23
22
CS5
CS6
CS7
CS8
SGND
CS4
RSET
EN
FAULT
PLL
AGND
DGND
AGND
AGND
CSFB1
AGND
AGND
AGND
AGND
ADDR1
SCLK
SDI
CSB
OVP
31 30 29
ADDR0
VSYNC
GSCLK
16 17 18
VIN
VCC
VCCIO
21
20
19
CSFBO
AGND
SDO
7
8
9
CS3
CS2
CS1
Absolute Maximum Ratings1
TA = 25OC unless otherwise noted.
Symbol Description Value Units
VLX LX Voltage to GND 45
V
VIN,EN Input Voltage, EN to GND -0.3 to 30
VCSx Output current sinks CS1 – CS16 to GND -0.3 to 35
VCC Low Voltage Pin to GND -0.3 to 6.0
OVP, COMP, SYNC, VSYNC, GSCLK, RSET,
SDI, SDO, SCLK, CS B, PLL, FLAUT,
CSFB, CSFBi, CSFBo, ADDR0, ADDR1
OVP, COMP, SYNC, VSYNC, GSCLK, RSET, SDI, SDO,
SCLK, CS B, PLL, FLAUT, CSFB, CSFBi, CSFBo, ADDR0,
ADDR1 Voltage to GND
-0.3 to V CC + 0.3
IOUT Maximum DC Output Current21800 mA
TJMaximum Junction Operating temperature -40 to +150 °C
TLEAD Maximum Soldering Temperature (at leads, 10 sec) 300
Thermal Information3
Symbol Description Value Units
ΘJA Thermal Resistance423 OC/W
PDMaximum Power Dissipation 4.3 W
6
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Electrical Characteristics1
VIN=24V; CIN = 4.7µF, COUT = 4.7µF; CVCC = 2.2µF; L1 = 10µH; RSET =10.2kΩ (ICSx = 60mA); TA = -40oC to 85oC unless
otherwise noted. Typical values are at TA = 25oC.
Symbol Description Conditions Min Typ Max Units
Power Supply, Current Sinks
VIN Input Voltage Range 10.8 28.0 V
VUVLO Under-Voltage Threshold
VIN Rising 10 V
Hysteresis 500 mV
VIN Falling 8.5 V
VOUT Output Voltage Range VIN = 10.8 to 28.0V VIN + 3V 40 V
IQ_2400
Quiescent Current of AAT2400 (no
switching) ICSx = 0mA, VCSx = 1V 3 mA
IQ_2401 Quiescent Current of AAT2401 ICSx = 0mA, VCSx = 1V 5 mA
ISD VIN Pin Shutdown Current CSn = IN, EN = Logic Low; includes CSx
+ LX leakage current 25 µA
IEN_LEAKAGE Enable Leakage Current EN = 5V 5 µA
IADDR0, IADDR1 Input Current to ADDR0 and ADDR1 ADDR0 = 5V, ADDR1 = 5V 100 µA
VOVP
Over-Voltage Threshold VOUT Rising 1.1 1.2 1.3 V
Over-Voltage Hysteresis VOUT Falling 100 mV
RDS(ON)LO Low Side Switch On-Resistance 180 mΩ
ILIMIT Low Side Switch Current Limit 4.5 6.5 A
FOSC Oscillator Frequency 500 600 700 kHz
FSYNC Sync Frequency 300 900 kHz
TSS Soft-Start VOUT = 35V 1 ms
ICSx / IRSET Current Set Ratio ICSx/IRSET
, VRSET = 0.6V nom, Full Scale Dot
Correction 1024 A/A
VCx Current Sink Voltage EN = Logic High, ICSx = 60mA (RSET =
10.2kΩ) 0.8 V
ICSx Current Sink Accuracy ICSx = 60mA -2.5 +2.5 %
ICSx-Matching
Current Matching Between Any Sink
Channel ICSx= 60mA -2 +2 %
VCx(SHORT) Shorted Diode(s) Detection Threshold ICSx= 60mA 3V
Logic Level Inputs: EN, SYNC, VSYNC, GSCLK, SDI, SCLK, CSB
VI(L) Input Logic Threshold Low 0.4 V
VI(H) Input Logic Threshold High 1.4 V
VI(H)_EN Enable Logic Threshold High 2.5 V
7
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Electrical Characteristics1
VIN=24V; CIN = 4.7µF, COUT = 4.7µF; CVCC = 2.2µF; L1 = 4.2µH; RSET =10.2kΩ (ICSx = 60mA); TA = -40oC to 85oC unless
otherwise noted. Typical values are at TA = 25oC.
Symbol Description Conditions Min Typ Max Units
Logic Level Outputs: SDO, FAULT
VCCIO VCC I/O Voltage Range No Load 2.97 3.3 3.63 V
VO(H) Output Logic Level High ISOURCE = 4mA, VCCIO = 3.3V 2.4 V
VO(L) Output Logic Level Low ISINK = -4mA 0.4 V
VFAULTLOW FAULT Logic Output Low 0.4 V
ISINK FAULT Logic Hi Leakage VFAULT = 5.5V 1 µA
Interface: VSYNC, GSCLK
FVSYNC VSYNC Maximum Frequency 55 250 Hz
FGSCLK GSCLK Frequency 1 MHz
tSETUP(SU_VS) Minimum VSYNC Setup Time GSCLK, VSYNC 24 ns
tHOLD(H_VS) Minimum VSYNC Hold Time GSCLK, VSYNC 24 ns
TGS(HI/LO_ MIN) Minimum GSCLK Clock High/Low Time 32 ns
tSCLK(HI/LO_ MIN) Minimum SCLK Clock High/Low Time 32 ns
tVS(HI/LO_ MIN) Minimum VSYNC Clock High/Low Time 32 ns
SPI Interface: SDI, SDO, SCLK, CSB
FMAX Maximum Clock Frequency 30 MHz
tSETUP(SU_ SDI) Minimum SDI Setup Time SDI, SCLK 24 ns
tSETUP(SU_CS) Minimum CSB Setup Time CSB, SDI 24 ns
tHOLD(H_ SDI) Minimum SDI Hold Time SDI, SCLK 24 ns
Thermal Protection
TJ2(SD) TJ Thermal Shutdown Threshold Reset Thermal Threshold 140 °C
TJ2(HYS) TJ Thermal Shutdown Hysteresis CTL1 and CTL2 Registers are Reset to 0 15 °C
TJ1(SD) TJ Thermal Warning Threshold Warning Thermal Threshold 120 °C
TJ1(HYS) TJ Thermal Warning Hysteresis 15 °C
8
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
SPI Timing Diagram
tSETUP(SU-CS)
CSB
SCLK
tSETUP(SU-SDI)tHOLD(H-SDI)
SDI / SDO
9
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Typical Characteristics
AAT2400 Boost Converter Efficiency
vs. Output Current
(VOUT = 38V)
Output Current (A)
Efficiency (%)
0.00.2 0.40.6 0.81.0 1.21.4 1.61.8 2.0
86
88
90
92
94
96
98
VIN = 26V
VIN = 24V
VIN = 22V
LED Current vs. Input Voltage
(60mA/ch)
Input Voltage (V)
LED Current (mA)
21.6 22.4 23.2 24.0 24.8 25.6 26.4 27.2 28.0
59.80
59.85
59.90
59.95
60.00
60.05
60.10
60.15
60.20
Sum of AAT2400 and AAT2401
Quiescent Current vs. Temperature
(VIN = 24V)
Temperature (°C)
Quiescent Current (mA)
-401
06
0-153
58
5
0
1
2
3
4
5
6
7
8
9
Sum of AAT2400 and AAT2401
Shutdown Current vs. Temperature
(VIN = 24V)
Temperature (°C)
Shutdown Current (µA)
-401
06
0-153
58
5
0
5
10
15
20
25
30
35
40
Output Current Matching vs. Temperature
(60mA/ch)
Temperature (°C)
Output Current (mA)
-401
06
0-153
58
5
55
56
57
58
59
60
61
62
63
64
65
AAT2400 Boost Converter Low Side
On-Resistance vs. Temperature
Temperature (°C)
Low Side On Resistance (mΩ)
-401
06
0-153
58
5
0
50
100
150
200
250
300
350
10
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Typical Characteristics
Switching Frequency vs. Temperature
Temperature (°C)
Switching Frequency (kHz)
-401
06
0-153
58
5
560
570
580
590
600
610
620
630
640
Turn On
(VIN = 24V; 50mA/ch)
Time (1ms/div)
SDI
(2V/div)
VOUT
(10V/div)
IOUT
(500mA/div)
VSINK
(5V/div)
800mV
0mA
24V
0V
Turn Off
(VIN = 24V; 50mA/ch)
Time (1ms/div)
SDI
(2V/div)
VOUT
(10V/div)
IOUT
(500mA/div)
VSINK
(10V/div)
0V
34V
800mV
0mA
UVLO Falling vs. Temperature
Temperature (°C)
UVLO Falling (V)
-401
06
0-153
58
5
8.4
8.6
8.8
9.0
9.2
9.4
9.6
9.8
10.0
UVLO Rising vs. Temperature
Temperature (°C)
UVLO Rising (V)
-401
06
0-153
58
5
8.4
8.6
8.8
9.0
9.2
9.4
9.6
9.8
10.0
V
CCIO
vs. I
VCCIO
(VIN = 12V)
ICC (mA)
V
CCIO
(V)
20
04
010 5030
3.00
3.10
3.20
3.30
3.40
3.50
3.60
85°C
25°C
-40°C
11
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Functional Block Diagram
AAT2400 (master)
Temperature Detect
SPI
Interface
7-bit Dot Correction
Fault Condition Reporting
4096 x PLL
Mux
Control
Control
Control
Control
Control
Control
Control
Control
CS1
CS2
CS3
CS4
CS5
CS6
CS7
CS8
8x31
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
8-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
12-bit Delay Time
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
12-bit Gray Scale PWM
8
PWM
Logic
COMP
OVP
EN
LX
SCLK
SDI
CSB
SDO
ADDR0
ADDR1
VSYNC
GSCLK
RSET
SGND
Vfb
Fault Detect
SYNC
CSFB
16
PGND
AGND
FAULT
PLL
DGND
VCCIO
VINLinear
Regulator
VCC
12
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
AAT2401 (slave)
Temperature Detect
SPI
Interface
7-bit Dot Correction
Fault Condition Reporting
4096 x PLL
Mux
Control
Control
Control
Control
Control
Control
Control
Control
CS9
CS10
CS11
CS12
CS13
CS14
CS15
CS16
8x31
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
8-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
12-bit Delay Time
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
7-bit Dot Correction
12-bit Gray Scale PWM
8
EN
SCLK
SDI
CSB
SDO
ADDR0
ADDR1
VSYNC
GSCLK
RSET
SGND
Vfb
Faul t Detect
16
AGND
CSFBCSFB
O
FAULT
VCCIO
VINLinear
Regulator
PLL
DGND
OVP
VCC
CSFBI
13
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T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Functional Description
The AAT2400 consists of a high efficiency DC/DC boost
controller, an integrated slew rate controlled input dis-
connect MOSFET switch, and a MOSFET power switch. A
high voltage rectifier, power inductor, output capacitor,
feedback compensation network, and OVP resistor divid-
er network are required to implement a DC/DC boost
converter.
The AAT2400’s boost controller is designed to deliver
1600mA up to 40V. It can drive a total of 16 current
regulated sinks (8 from its own and 8 from AAT2401) with
10 HB white LEDs connected in series at each channel.
The maximum LED sink current can be set by an exter-
nal resistor. Each current sink can be programmed
through the SPI interface. Each sink allows independent
control with different registers (DOT correction, Gray
Scale, Delay, On/Off control configuration).
AAT2400 and AAT2401 both provide one linear regulator
for VCCIO supply.
Control Loop
The AAT2400 provides the benefits of current mode con-
trol with a simple feedback loop. The device maintains
exceptional DC regulation, transient response, and cycle-
by-cycle current limit with additional RC compensation
components. The AAT2400 modulates the power MOSFET
switching current in response to changes in output volt-
age (LED voltage). This allows the voltage loop to directly
program the required inductor current in response to
changes in the output load. The switching cycle initiates
when the N-channel MOSFET is turned ON and current
ramps up in the inductor. The ON interval is terminated
when the feedback signal crossover the falling edge of the
saw wave from the PWM modulator. During the OFF inter-
val, the inductor discharges the energy (inductor ramps
down) until the lower threshold, or zero inductor current,
is reached. The lower current is equal to the peak current
minus a preset hysteresis threshold which determines the
inductor ripple current. The peak current is adjusted by
the controller until the output current requirement is met.
The magnitude of the feedback error signal determines
the average input current. Therefore, the AAT2400 con-
troller implements a programmed current source con-
nected to the output capacitor and load resistor. There is
no right-half plane zero, and loop stability is achieved with
simple RC compensation components.
Soft Start / Enable
The input disconnect switch is activated when a valid
supply voltage is present and the EN/SET pin is strobed
high. Slew rate control on the input disconnect switch
ensures minimal inrush current as the output voltage is
charged to the input voltage, prior to switching of the
N-channel power MOSFET. A monotonic turn-on is guar-
anteed by the built-in soft-start circuitry, which elimi-
nates output current overshoot across the full input volt-
age range and over all load conditions.
Current Limit and
Over-Temperature Protection
The switching of the N-channel MOSFET terminates when
a current limit of 6.5A (max) is exceeded. This minimizes
power dissipation and component stresses under over-
load and short-circuit conditions. Switching resumes
when the current decays below the current limit. Thermal
protection disables the AAT2400/AAT2401 when the
internal power dissipation causes the junction tempera-
ture to reach the thermal limit threshold (140°C, nomi-
nal). When the thermal threshold is reached, the control
register, CTL1 or CTL2, is reset to 00h and all current
sinks are disabled. When the AAT2400's thermal thresh-
old is reached, the boost converter is also disabled.
Over-Voltage Protection
Over-voltage protection prevents damage to the AAT2400
during open-circuit on any LED channel sinks causing
high output voltage conditions. An over-voltage event is
defined as a condition where the voltage on the OVP pin
exceeds the over-voltage threshold limit (VOVP = 1.2V
typical). When the voltage on the OVP pin has reached
the threshold limit, the converter stops switching and
the output voltage decays. Switching resumes when the
voltage on the OVP pin drops below the lower hysteresis
limit, maintaining an average output voltage between
the upper and lower OVP thresholds multiplied by the
resistor divider scaling factor.
Under-Voltage Lockout
Internal bias of all circuits is controlled via the VIN input.
Under-voltage lockout (UVLO) guarantees sufficient VIN
bias and proper operation of all internal circuitry prior to
soft start.
14
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T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Current Sink Control
Each current sink has an independent property pro-
grammed by the following registers. The AAT2400 con-
tains current sinks 1 through 8. The AAT2401 contains
current sinks 9 through 16.
Dot Correction
Each current sink can have a separate current setting to
compensate for relative LED brightness. This register
has a default setting of half scale.
ADDR:
00h to 1Eh
DOTn:
DOT Correction Current Setting
Bit Bit Name Default Access Description
7:0 DOTn 7:0 7Fh R/W 8-bit DOT word
Table 1: DOT Correction Current Setting.
Gray Scale
Each current sink has a unique PWM duty cycle setting to
provide a given brightness. The gray scale register is a
12-bit word divided into an 8-bit word and a 4-bit word.
This register has a default setting of ½ scale, or 0400h.
Only even register addresses are used starting from 40h
to 7Eh.
ADDR:
40h to 7Eh
GSn LSB:
Gray Scale Setting LSB
Bit Bit Name Default Access Description
7:0 GSn 7:0 00h R/W 8 LSBs of 12-bit
GS word
Table 2: Gray Scale Setting LSB.
ADDR:
40h to 7Eh
GSn MSB:
Gray Scale Setting MSB
Bit Bit Name Default Access Description
3:0 GSn 11:8 04h R/W 4 MSBs of 12-bit
GS word
Table 3: Gray Scale Setting MSB.
Delay
Each current sink has a unique delay time from the start
of VSYNC to when the current sink PWM cycle begins. The
delay register is a 12-bit word divided into an 8-bit word
and a 4-bit word. This register has a default setting of 0.
Only even register addresses are used. Starting from 80h,
every other even register is programmed up to BEh.
ADDR:
80h to BEh
DLYn LSB:
Delay Setting LSB
Bit Bit Name Default Access Description
7:0 DLYn 7:0 00h R/W 8 LSBs of 12-bit
GS word
Table 4: Delay Setting LSB.
ADDR:
80h to BEh
DLYn MSB:
Delay Setting MSB
Bit Bit Name Default Access Description
3:0 DLYn 11:8 00h R/W 4 MSBs of 12-
bit GS word
Table 5: Delay Setting MSB.
Current Sink ON/OFF
Each current sink can be independently enabled or dis-
abled. In the event of an over temperature condition,
this register is reset to 00h and must be reprogrammed
to resume operation. It has a default setting of 00h (all
sinks are off).
ADDR: C0h
CTL1:
This Register Enables or
Disables Each Current Sink
Independently
Bit Bit Name Default Access Description
7:0 CS8:CS1 00h R/W
0 = current
sink OFF, 1=
current sink ON
Table 6: CTL1 Setting.
ADDR: C2h
CTL2:
This Register Enables or
Disables Each Current Sink
Independently
Bit Bit Name Default Access Description
7:0 CS16:CS9 00h R/W
0 = current sink
OFF, 1= current
sink ON
Table 7: CTL2 Setting.
15
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T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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PWM Timing
The PWM “on time” of a given current sink is set by the
gray scale and delay registers according to the following
timing diagram. TVSYNC is the period of the VSYNC signal,
typically 1/120 Hz, or 8 1/3 ms, but TVSYNC can be as short
as 500µs. GSCLK is either derived from VSYNC, where FGSCLK
= 4096 x FVSYNC, or supplied by an external signal at the
GSCLK pin. TDLY is the number between 0 and 4095 of the
DLY register, and is the number of GSCLK rising edges
between the rising edge of VSYNC and the rising edge of the
PWM signal. Likewise, TPWM is the number between 0 and
4095 of the GS register, and is the number of GSCLK
periods of the PWM “on time”. The current sink conducts
during the PWM “on time” (shown high in the following
timing diagram). If TPWM is not met by the end of TVSYNC,
the PWM on time will overflow onto the next TVSYNC period.
LED % Brightness = TPWM /4096 x 100.
Device Address Setup
The device address is set by the two address pins,
ADDR1 and ADDR0. Each address pin has four decode
levels resulting in 16 possible address settings. The
address is programmed by connecting ADDR1 and
ADDR0 to VCC, GND, SDI, or by leaving the ADDR pin
unconnected. The master and slave devices can be pro-
grammed with the same device address. The register
addressing will automatically select the appropriate mas-
ter/slave device for the addressed current sink.
PWM
GSCLK
VSYNC
TVSYNC
TDLYTPWM
1 4096
Figure 1: PWM Timing Diagram.
Device Address
SPI Address:
Addr1 Addr0 Decoding of Address Set Resistors
Bit Bit Name Description
1:0 ADDR0 00: connect to VCC; 01: OPEN; 10: connect to SDI; 11: connect to GND
3:2 ADDR1 00: connect to VCC; 01: OPEN; 10: connect to SDI; 11: connect to GND
Table 8: Device Address Settings.
16
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Conguration Bits
Address (Hex)ADDR1 ADDR0 6 5 4 3 2 1 0 W
VCC VCC 1 0 1 0 0 0 0 0 A0
VCC OPEN 1 0 1 0 0 0 1 0 A2
VCC SDI 1 0 1 0 0 1 0 0 A4
VCC GND 1 0 1 0 0 1 1 0 A6
OPEN VCC 1 0 1 0 1 0 0 0 A8
OPEN OPEN 1 0 1 0 1 0 1 0 AA
OPEN SDI 1 0 1 0 1 1 0 0 AC
OPEN GND 1 0 1 0 1 1 1 0 AE
SDI VCC 1 0 1 1 0 0 0 0 B0
SDI OPEN 1 0 1 1 0 0 1 0 B2
SDI SDI 1 0 1 1 0 1 0 0 B4
SDI GND 1 0 1 1 0 1 1 0 B6
GND VCC 1 0 1 1 1 0 0 0 B8
GND OPEN 1 0 1 1 1 0 1 0 BA
GND SDI 1 0 1 1 1 1 0 0 BC
GND GND 1 0 1 1 1 1 1 0 BE
Table 9: Device Address Write Table and Configuration.
Conguration Bits
Address (Hex)ADDR1 ADDR0 6 5 4 3 2 1 0 R
VCC VCC 1 0 1 0 0 0 0 1 A1
VCC OPEN 1 0 1 0 0 0 1 1 A3
VCC SDI 1 0 1 0 0 1 0 1 A5
VCC GND 1 0 1 0 0 1 1 1 A7
OPEN VCC 1 0 1 0 1 0 0 1 A9
OPEN OPEN 1 0 1 0 1 0 1 1 AB
OPEN SDI 1 0 1 0 1 1 0 1 AD
OPEN GND 1 0 1 0 1 1 1 1 AF
SDI VCC 1 0 1 1 0 0 0 1 B1
SDI OPEN 1 0 1 1 0 0 1 1 B3
SDI SDI 1 0 1 1 0 1 0 1 B5
SDI GND 1 0 1 1 0 1 1 1 B7
GND VCC 1 0 1 1 1 0 0 1 B9
GND OPEN 1 0 1 1 1 0 1 1 BB
GND SDI 1 0 1 1 1 1 0 1 BD
GND GND 1 0 1 1 1 1 1 1 BF
Table 10: Device Address Read Table and Configuration.
17
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Fault Reporting
Each device possesses fault reporting registers and a
fault flag. An open or short condition on each current
sink is reported in one of four fault registers. An open
fault condition is only monitored for LED current sink on-
times of greater than 10µs. An over-temperature condi-
tion is reported in one of two registers. These conditions
may selectively be reported on the open drain Fault pin.
Bits in separate fault reporting registers can be set or
reset to enable or disable a particular fault condition.
The shorted LED fault condition is handled in a special
way because of the uncertainty associated with shorted
LEDs and the LED forward voltage variation. To detect a
shorted LED fault in the system, all LED channels should
be programmed to be conducting for at least 1ms. The
fault flag will only be valid 1ms after a given LED string
has begun conducting. If the fault flag becomes active,
the fault registers must be read while the channels remain
conducting. The fault reporting register defaults to the
condition of reporting the short detect, so this register
must be cleared prior to checking for shorted LEDs.
Severe LED forward voltage (VF) mismatches between
channels will also be reported as a short fault condition
with the lower VF channels indicating the fault condition.
Fault Registers
The fault registers can be read anytime during opera-
tion.
ADDR: E0h
Fault1:
This Register Reports Fault
Conditions And High Voltage CS Pins
Bit
Bit
Name Default Access Description
1:0 CS1
Fault 00h R 00: no fault, 01: open,
10: short
3:2 CS2
Fault 00h R 00: no fault, 01: open,
10: short
5:4 CS3
Fault 00h R 00: no fault, 01: open,
10: short
7:6 CS4
Fault 00h R 00: no fault, 01: open,
10: short
Table 11: Fault1 Register Settings.
ADDR:
E2h
Fault2:
This Register Reports Fault
Conditions and High Voltage CS Pins
Bit
Bit
Name Default Access Description
1:0 CS5
Fault 00h R 00: no fault, 01: open,
10: short
3:2 CS6
Fault 00h R 00: no fault, 01: open,
10: short
5:4 CS7
Fault 00h R 00: no fault, 01: open,
10: short
7:6 CS8
Fault 00h R 00: no fault, 01: open,
10: short
Table 12: Fault2 Register Settings.
ADDR:
E4h
Fault3:
This Register Reports Fault
Conditions And High Voltage CS Pins
Bit
Bit
Name Default Access Description
1:0 CS9
Fault 00h R 00: no fault, 01: open,
10: short
3:2 CS10
Fault 00h R 00: no fault, 01: open,
10: short
5:4 CS11
Fault 00h R 00: no fault, 01: open,
10: short
7:6 CS12
Fault 00h R 00: no fault, 01: open,
10: short
Table 13: Fault3 Register Settings.
ADDR: E6h
Fault4:
This Register Reports Fault
Conditions and High Voltage CS Pins
Bit
Bit
Name Default Access Description
1:0 CS13
Fault 00h R 00: no fault, 01: open,
10: short
3:2 CS14
Fault 00h R 00: no fault, 01: open,
10: short
5:4 CS15
Fault 00h R 00: no fault, 01: open,
10: short
7:6 CS16
Fault 00h R 00: no fault, 01: open,
10: short
Table 14: Fault4 Register Settings.
18
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Temperature Fault Conditions
Two thermal limits are reported in each AAT2400/2401
device. The first thermal limit serves as a warning that
the device is heating up. When this condition is reported,
the system can compensate by lowering the current lev-
els of the current sinks. The second thermal limit is the
maximum temperature allowed. When this temperature
is reached, the control registers are reset to 0 which dis-
ables all current sinks. In addition, the boost converter in
the master device is disabled. To resume operation, the
control registers must be reset, and all of the configura-
tion registers must be reprogrammed, since data reten-
tion at the maximum temperature is not guaranteed.
ADDR:
E8h
OTMP1:
Reports the Temperature Condition
of the Master IC (CS8 to CS1)
Bit
Bit
Name Default Access Description
1:0 OTMP 1 00h R
00: Tj < T1
01: T1 < Tj < T2
11: T2 < Tj
2Cong 0h R/W
0: Report T1 and T2
Thermal Limits on
Fault pin
1: Report only T2 Ther-
mal Limit on Fault pin
Table 15: OTMP1 Settings.
ADDR:
EAh
OTMP2:
Reports the Temperature Condition
of the Slave IC (CS16 to CS9)
Bit
Bit
Name Default Access Description
1:0 OTMP 2 00h R
00: Tj < T1
01: T1 < Tj < T2
11: T2 < Tj
2Cong 0h R/W
0: Report T1 and T2
Thermal Limits on
Fault pin
1: Report only T2 Ther-
mal Limit on Fault pin
Table 16: OTMP2 Settings.
Fault Reporting Registers
Each individual sink’s fault reporting can be configured to
the following cases: LED string becomes open, LED string
becomes short completely, reporting both or report none.
To turn this feature off, set two bits to ‘11’. Setting the
two bits to ‘01’ and ‘10’ means reporting short condition
only or reporting open condition only accordingly. To
report both faulty conditions, set the two bits to ‘00’.
ADDR: F0h
Fault Reporting 1:
Individual Sink Fault Reporting
Bit Bit Name Default Access Description
1:0 CS1 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
3:2 CS2 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
5:4 CS3 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
7:6 CS4 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 17: Fault Reporting Register 1 Settings.
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ADDR: F2h
Fault Reporting 2:
Individual Sink Fault Reporting
Bit Bit Name Default Access Description
1:0 CS5 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
3:2 CS6 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
5:4 CS7 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
7:6 CS8 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 18: Fault Reporting Register 2 Settings.
ADDR: F4h
Fault Reporting 3:
Individual Sink Fault Reporting
Bit Bit Name Default Access Description
1:0 CS9 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
3:2 CS10 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
5:4 CS11 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
7:6 CS12 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 19: Fault Reporting Register 3 Settings.
ADDR: F6h
Fault Reporting 4:
Individual Sink Fault Reporting
Bit Bit Name Default Access Description
1:0 CS13 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
3:2 CS14 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
5:4 CS15 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
7:6 CS16 Fault 10h R/W
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 20: Fault Reporting Register 4 Settings.
Serial Peripheral Interface (SPI)
The serial peripheral interface is a synchronous serial
interface for address and data transfer at bit rates of up
to 30Mhz. It is configured in 8-bit bytes designed to
interface with a standard SPI bus on many microcon-
trollers. Four pins are used to communicate on the SPI:
SCLK (synchronous clock), CS (chip select, to signify the
start of a transfer), SDI (data input to the AAT2400/2401
for write operations, latched on the rising edge of SCLK),
and SDO (data output from the AAT2400/2401 for read
operations, presented on the falling edge of SCLK).
Data and address are always sent MSB first. The first
8-bit byte of a transfer is always the device address. The
second byte of a transfer is always the address of the
register to be written to or read from. The subsequent
bytes are one or more bytes of data. The LSB (bit 0) of
the device address byte contains a bit that signifies a read
or a write operation. If R/W is 0, one or more write cycles
occur, and if R/W is 1, one or more read cycles occur.
Multi-byte transfers are similar to single byte transfers,
except that the CS pin is held low, and additional SCLK
cycles are sent until the end of the burst. In multi-byte
transfers, the registers are written to or read from in
sequential order. After the end of the address space, the
multi-byte transfer is terminated.
20
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SPI Single-Byte Write
SDI
SCLK
SDO
CS
High Impedance
“0”“1”
7-Bit Device AddressW
“1”“0 ”
8-Bit Register Address
R7 R6 R2 R0R5 R1R4 R3A3 A2 A1 A0 D7 D6 D2 D0D5 D1D4 D3
8-Bit Data written in
SPI Single-Byte Read
“0”“1”A3 A2 A1 A0 “1”R7 R6
7-Bit Device Address8-Bit Register AddressR
8-Bit Data read out
SDI
SCLK
SDO
CS
High Impedance
High Impedance or don’t care
“1”R2 R0R5 R1R4 R3
D7 D6 D2 D0D5 D1D4 D3
SPI Multi-Byte Write Transfer
SDI
SCLK
SDO
CS
High Impedance
Device Addr & WRegister AddressData Byte n Data Byte n+1Data Byte n+m
SPI Multi-Byte Read Transfer
SDI
SCLK
SDO
CS
High Impedance
Device Addr & RRegister Address
Data Byte n Data Byte n+1Data Byte n+m
High Impedance or don’t care
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Application Information
Channel Disable
If current sink channels on either the AAT2400 or AAT2401
are not used, they must be terminated. Unused channels
should have their corresponding bit in the CTL1 or CTL2
register set to zero. In applications where the AAT2400/
AAT2401 pair are used, unused channels may be tied to
GND or to VCC. In applications where the AAT2401 is
used alone, unused channels must be tied to VCC.
LED Selection
Although the AAT2400 and 2401 are specifically designed
to drive high current white LEDs, the device can also be
used to drive most types of LEDs with forward voltages
ranging between 2.0V and 4.7V. Since all current sinks
are matched with low voltage dependence, the LED-to-
LED brightness will be matched regardless of the indi-
vidual LED forward voltage (VF) levels. It makes the
AAT2400 and 2401 a perfect combination for large LCD
TV backlighting LED applications.
Constant Current Setting
The LED current is controlled by the RSET resistor. For
maximum accuracy, a 1% tolerance resistor is recom-
mended. Table 21 shows the RSET resistor value for
AAT2400 and 2401 for various LED full-scale current
levels.
1024(A/A) · 0.6V
ICSx
RSET =
ICSX (mA) RSET (kΩ)
40 15.4
50 12.3
60 10.2
70 8.76
80 7.68
90 6.81
100 6.12
Table 21: Maximum LED Current and RSET
Resistor Values (1% Resistor Tolerance).
Over-Voltage Protection
The over-voltage protection circuit consists of a resistor
network connected from the output voltage to the OVP
pin (see Figure 2). This over voltage protection circuit
prevents damage to the device when one of the 16 chan-
nels has an open LED circuit. The rest of the channels of
AAT2400 and AAT2401 continue to operate.
The resistor divider can be selected such that the over-
voltage threshold occurs prior to the output reaching 45V
(VOUT(MAX)). The value of R5 should be selected from 10kΩ
to 20kΩ to minimize switching losses without degrading
noise immunity.
V
OUT(PROTECTION)
VOVP
R4 = R5 - 1
AAT2400
OVP
AGND
COUT
R4
R5
V
OUT
Figure 2: Over-Voltage Protection Circuit.
If 10 LEDs are connected in series on one channel sink,
the total VF from the WLEDs could be as high as 42V.
Therefore, using R5 = 12.1kΩ and setting VOUT(PROTECTION) =
45V is recommended. Selecting a 1% resistor, this results
in R4 = 442kΩ (rounded to the nearest standard 1%
value). It is always recommended to use the same num-
ber of WLEDs on each channel and set the appropriate
over-voltage protection. Failure to do so may cause any
one of the 16 sink pins to exceed the absolute maximum
rating voltage and permanently damage the device in
case the channel is disconnected (open circuit failure).
LED Brightness Control
The AAT2400 and 2401 uses the SPI interface to program
and control LED brightness. Each channel sink current of
the AAT2400 and AAT2401 can be changed successively
to brighten or dim the LED string in smooth transitions
(i.e. dynamic local dimming or zone dimming), giving the
user complete programmability and real-time control of
LED brightness to tune the picture background to a true-
black and a true-white from the LED technology.
22
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Minimum and Maximum Practical Settings
for Gray Scale and Delay Registers
When using the internally generated PLL derived PWM
timebase, the stability of the frequency on VSYNC defines
the practical minimum and maximum settings for the
gray scale and delay registers. As a rule, the minimum
and maximum settings should be 4 counts away from full
scale. In other words, the register settings should lie
between 04h and 0FFBh. Otherwise, the natural phase
delay between jitter on VSYNC and the internal timebase
may result in unexpected PWM timing. Gray scale set to
zero, however, always results in zero on time.
Selecting the Schottky Diode
To ensure minimum forward voltage drop and no recov-
ery, high voltage Schottky diodes are recommended for
the AAT2400 boost converter. The output diode is select-
ed to maintain acceptable efficiency and reasonable
operating junction temperature under full load operating
conditions. Forward voltage (VF) and package thermal
resistance (θJA) are the dominant factors in selecting a
diode. The diode non-repetitive peak forward surge cur-
rent rating (IFSM) should be considered for high pulsed
load applications. IFSM rating drops with increasing con-
duction period.
Manufacturers’ datasheets should be reviewed carefully
to verify reliability under peak loading conditions. The
diode’s published current rating may not reflect actual
operating conditions and should be used only as a com-
parative measure between similarly rated devices.
60V/3A rated Schottky diodes are recommended for out-
put voltages less than 45V (total VF and 100mA/sink
application).
Estimating Schottky
Diode Power Dissipation
The switching period is divided between ON and OFF
time intervals:
1
FS
= tON + tOFF = D + D′
During the ON time, the N-channel power MOSFET is
conducting and storing energy in the boost inductor.
During the OFF time, the N-channel power MOSFET is
not conducting. Stored energy is transferred from the
input battery and boost inductor to the output load
through the output diode.
Duty cycle is defined as the ON time divided by the total
switching interval:
t
ON
tON + tOFF
D = = tON · FS
The maximum duty cycle can be estimated from the
relationship for a continuous mode boost converter.
Maximum duty cycle (DMAX) is the duty cycle at minimum
input voltage (VIN(MIN)):
V
OUT
- V
IN(MIN)
VOUT
DMAX =
The average diode current during the OFF time can be
estimated:
I
OUT
1 - DMAX
IAVG(OFF) =
The VF of the Schottky diode can be estimated from the
average current during the off time. The average diode
current is equal to the output current:
I
AVG(TOT)
= I
OUT
The average output current multiplied by the forward
diode voltage determines the loss of the output diode:
P
LOSS(DIODE)
= I
AVG(TOT)
· V
F
= I
OUT
· V
F
For continuous LED currents, the diode junction tem-
perature can then be estimated:
T
J(DIODE)
= T
AMB
+ θ
JA
· P
LOSS(DIODE)
External Schottky diode junction temperature should be
below 110°C, and may vary depending on application
and/or system guidelines. The diode θJA can be mini-
mized with additional metal PCB area on the cathode.
However, adding additional heat-sinking metal around
the anode may degrade EMI performance. The reverse
leakage current of the rectifier must be considered to
maintain low quiescent (input) current and high effi-
ciency under light load. The rectifier reverse current
increases dramatically at elevated temperatures.
23
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Manufacturer Part Number
Rated Foward
Current (A)
Rated Voltage
(V)
Thermal Resistance,
θJA, (°C/W) Case
Diode, Inc. B360A 3A 60 100 SMA
ON Semi MBRD360 3A 60 80 DPAK
Table 22: Typical Surface Mount Schottky Rectifiers for Various Output Loads
(select TJ < 110°C in Application Circuit).
Selecting the Boost Inductor
The AAT2400 controller utilizes PWM control and the
switching frequency is fixed. To maintain 600kHz switch-
ing frequency and stable operation, a 10μH inductor is
recommended. Manufacturer’s specifications list both
the inductor DC current rating, which is a thermal limita-
tion, and peak inductor current rating, which is deter-
mined by the saturation characteristics. Measurements
at full load and high ambient temperature should be per-
formed to ensure that the inductor does not saturate or
exhibit excessive temperature rise.
The output inductor (L) is selected to avoid saturation at
minimum input voltage and maximum output load condi-
tions. Worst-case peak current occurs at minimum input
voltage (maximum duty cycle) and maximum load. At
high load the switching frequency is somewhat dimin-
ished, resulting in higher IPEAK. Bench measurements are
recommended to confirm actual IPEAK and to ensure that
the inductor does not saturate at maximum LED current
and minimum input supply voltage. The RMS current
flowing through the boost inductor is equal to the DC
plus AC ripple components. Under worst case RMS condi-
tions, the current waveform is critically continuous. The
resulting RMS calculation yields worst case inductor loss.
The RMS current value should be compared against the
inductor manufacturer’s temperature rise, or thermal
degrading, guidelines:
I
PEAK
3
IRMS =
For a given inductor type, smaller inductor size leads to
an increase in DCR winding resistance and, in most
cases, increased thermal impedance. Winding resistance
degrades boost converter efficiency and increases the
inductor’s operating temperature:
PLOSS(L) = I2
RMS · DCR
Manufacturer Part Number
Inductance
(µH)
Saturated
Rated Current
(A)
DCR
(mΩ)
Size (mm)
LxWxH Type
Cooper
Bussmann DR1040-100-R 10 4.4 26 10.3 x 10.5 x 4.0 Shielded Drum Core
Cooper
Bussmann DR1050-100-R 10 4.58 18 10.3 x 10.5 x 5.0 Shielded Drum Core
Sumida CDR12D43RNP-100M 10 6.3 18 12.4 x 12.4 x 4.5 Shielded Drum Core
Sumida CDR10D48MNNP-100MC 10 5.5 32 10.3 x 10.3 x 5.0 Shielded Drum Core
Sumida CDRH10D43RNP-100NC 10 5.2 26.1 10.5 x 10.8 x 4.5 Shielded Drum Core
Sumida CDRH105RNP-100NC 10 4.45 26 10.3 x 10.5 x 5.0 Shielded Drum Core
TDK VLF10045T-100M4R3-PF 10 4.3 25 9.7 x 10.0 x 4.5 Shielded Drum Core
TDK RLF12545T-100M5R1-PF 10 6 12.4 12.8 x 12.5 x 4.7 Shielded Drum Core
Würth Elektronik WE-PD Type “LS“ - 100 10 4.2 25 12 x 12 x 4.5 Shielded Drum Core
Table 23: Typical Suggested Surface Mount Inductors.
24
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
AAT2400/2401 Input Capacitors
In general, it is good design practice to place a decou-
pling capacitor (input capacitor) between the IN and GND
pins. An input capacitor in the range of 2.2μF to 10μF is
recommended. A larger input capacitor in this application
may be required for stability and transient response.
Multi-layer ceramic (MLC) capacitors provide small size
and adequate capacitance, low parasitic equivalent
series resistance (ESR) and equivalent series inductance
(ESL). MLC capacitors of type X7R or X5R are good to
ensure capacitance stability over the full operating tem-
perature range.
Boost Converter
Output Capacitor Selection
For best performance, a low-ESR aluminum electrolytic
type capacitor is suggested for use with the AAT2400
boost converter output. Other capacitor dielectric types
are compatible and may be used such as Polymer cath-
ode tantalum chip capacitors or low ESR OS-CON (organ-
ic semiconductor) capacitors. The voltage rating for a
selected capacitor should exceed the greatest operating
output voltage for the AAT2400 boost converter. Best
engineering practices would recommend a capacitor volt-
age rating of two times the maximum operating voltage,
although any voltage rating above the maximum operat-
ing output voltage of the boost converter is acceptable.
PCB Layout Guidelines
Boost converter performance can be adversely affected
by poor layout. Possible impact includes high input and
output voltage ripple, poor EMI performance, and
reduced operating efficiency. Every attempt should be
made to optimize the layout in order to minimize para-
sitic PCB effects (stray resistance, capacitance, and
inductance) and EMI coupling from the high frequency
LX node. A suggested PCB layout for the AAT2400 boost
converter is shown in Figures 4 and 7. The following PCB
layout guidelines should be considered:
1. Minimize the distance from Capacitor C1 and C2’s
negative terminals to the PGND pins. This is espe-
cially true with output capacitor C2, which conducts
high di/dt current from the output diode back to the
PGND pins.
2. Minimize the distance between L1 to D1 and switch-
ing pin SW; minimize the size of the PCB area con-
nected to the SW pin.
3. Maintain a ground plane and connect to the IC PGND
pin(s) as well as the PGND connections of CIN and
COUT.
4. Consider additional PCB metal area on D1’s cathode
to maximize heat sinking capability. This may be
necessary when using a diode with a high VF and/or
thermal resistance.
5. Consider additional PCB exposed area for the
AAT2400 to maximize heat sinking capability. This
may be necessary when using high output voltage
and high current with minimum input voltage appli-
cation. Connect the exposed paddle (bottom of the
die) to PGND or GND. Connect AGND, DGND to
SGND as close as possible to the package and maxi-
mize the heat sinking space for overall.
6. To maximize package thermal dissipation and power
handling capacity of the AAT2400 and AAT2401
TQFN55-36 package, solder the exposed paddle of
the IC onto the thermal landing of the PCB, where
the thermal landing is connected to the ground
plane. If heat is still an issue, multi-layer boards
with dedicated ground planes are recommended.
Also, adding more thermal vias on the thermal land-
ing would help transfer heat to the PCB effectively.
25
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Manufacturer Part Number Capacitance (μF) Voltage Rating (V) Temp Co. Case Size
Murata GRM185R60J225KE26 2.2 6.3 X5R 0603
Murata GRM188R71A225KE15 2.2 10 X7R 0603
Taiyo Yuden JMK107BJ225KK-T 2.2 6.3 X7R 0603
Taiyo Yuden LMK107BJ225KA-T 2.2 10 X7R 0603
Murata GRM31CR61H225KA88L 2.2 50 X5R 1206
TDK C3225X7R2A225K 2.2 100 X5R 1210
Murata GRM31CR71H475KA12L 4.7 50 X5R 1206
Panasonic EEV-HA1H2R2R 2.2uF 50V Elect SMD 4x4x5.4
Sanyo 50CE4R7BE 2.2uF 50V Elect SMD 4x4x5.4
Table 24: Typical Suggested Surface Mount Capacitors.
60V/3A
D1
L1 10µH
VIN
C1
4.7µF
50V
VOUT
C2
2.2µF
C3
2.2µF
24V
R3 12.1k
C6
10µF
C5
0.68µF
C4
18nF
R2
2k
R1
6.04k
R4
442k
R5
12.1k
LX
C8
4.7µF
50V
C9
2.2µF C10
2.2µF
VIN
R8 12.1k
C12
10µF C11
0.68µF
R6 2k
R9 2k
VCC
VCC1
R7
6.04k
LX
VCC VCC1
GND
GND
GND
GND
GND
GND
GND
GND
1
2
3
JP4
CSFB
VCC
GND
1 2
3 4
JP7
ADDR0
1 2
3 4
JP8
ADDR1
ADDR0
ADDR1
ADDR0
ADDR1
ADDR0
ADDR1
VCC
GND SDI
VCC
GND SDI
1
2
3
4
5
JP5
SP1
GND
SDO
SCLK
SDI
CSB
1
2
3
JP1
Enable
GND
LX
1
2
JP2
SYNC
VIN
1
2JP3
GSCLK
1 2
3 4
5 6
7 8
9 10
Header1
Header 5X2
EN EN
D2
Red LED
D3
Red LED
CS1
CS3
CS5
CS7
OUT
CS4
CS6
CS8
OUT
OUT
CS2 1 2
3 4
5 6
7 8
9 10
Header2
Header 5X2
CS9
CS11
CS13
CS15
OUT
CS12
CS14
CS16
OUT
CS10
VIN
CSB
SDI
SCLK
CSB
SDI
SCLK
GSCLK
VSYNC
GSCLK
VSYNC
SD0 SDO
C7
4.7µF
50V
R10
10k
1
2
3
4
5
JP6
SP1
GND
SDO
SCLK
SDI
CSB
VSYNC
CS3
7
CS4
6
CS8
4
SGND
5
CS2
8
RSET
10
EN
11
FAULT
12
PLL
13
VIN
16
VCCIO
18
SDO 19
COMP 20
CSFB 21
LX 24
LX 25
CS7
3
CS5
1
CS6
2
CS1
9
AGND
14
DGND
15
VCC
17
PGND 27
SYNC 22
NC 23
PGND 26
ADDR1 28
ADDR0 29
VSYNC 30
GSCLK 31
SDI 34
OVP 36
AGND 32
SCLK 33
CSB 35
U1
TQFN55-36
AAT2400
1
2
JP9
CSFBi
VCC1
CS11
7
CS12
6
CS16
4
SGND
5
CS10
8
RSET
10
EN
11
FAULT
12
PLL
13
VIN
16
VCCIO
18
SDO 19
GND 20
CSFBO 21
GND 24
GND 25
CS15
3
CS13
1
CS14
2
CS9
9
AGND
14
DGND
15
VCC
17
GND 27
GND 22
CSFBI 23
GND 26
ADDR1 28
ADDR0 29
VSYNC 30
GSCLK 31
SDI 34
OVP 36
AGND 32
SCLK 33
CSB 35
U2
TQFN55-36
AAT2401
GNDGNDGND
Figure 3: AAT2400 and AAT2401 DB1 Evaluation Board Schematic.
26
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Figure 4: AAT2400 and AAT2401 Evaluation Board Top Side Layout.
Figure 5: AAT2400 and AAT2401 Evaluation Board Middle-1 Layer Layout.
27
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Figure 6: AAT2400 and AAT2401 Evaluation Board Middle-2 Layer Layout.
Figure 7: AAT2400 and AAT2401 Evaluation Board Bottom Side Layout.
28
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Evaluation Board Component Lists
Component Part Number Description Manufacturer
U1 AAT2400IIH 8 channel white LED driver with current and timing
control (Master); 36 pin, 5x5 TQFN package Skyworks
R1 Chip Resistor 6.04kΩ, 1%, 1/4W; 0603 Vishay
R2 Chip Resistor 2kΩ, 1%, 1/4W; 0603 Vishay
R3, R5 Chip Resistor 12.1kΩ, 1%, 1/4W; 0603 Vishay
R4 Chip Resistor 442kΩ, 1%, 1/4W; 0603 Vishay
R6 Chip Resistor 2kΩ, 5%, 1/4W; 0603 Vishay
C1 GRM31CR71H475K 4.7µF, ±10%, 50V, X7R, 1206, 1.6mm Murata
C2, C3 GRM185R60J225KE26 2.2µF, ±10%, 6.3V, X5R, 0603, 0.5mm Murata
C4 GRM155R71H183KA12D 18nF, ±10%, 50V, X7R, 0402, 0.5mm Murata
C5 GRM188R71A684KA61D 0.68µF, ±10%, 10V, X7R, 0603, 0.8mm Murata
C6 GRM188R60J106M 10µF, ±10%, 6.3V, X5R, 0603, 0.8mm Murata
C7 50CE4R7BE 4.7µF 50V Aluminum Electrolytic Capacitor Sanyo
L1 RLF12545T-100M5R1-PF Shield Drum Core, 10µH, 6A, 12.4mΩ TDK
D1 MBRD360G 3.0A, 60V, SMA Schottky Barrier Rectier On-Semi
D2 LTST-C190CKT Red LED; 0603 Lite-On Inc.
JTAG1 HRP10H-ND Low prole 5x2 Con. Header, 2.54mm Assmann
JP1 - JP7 PRPN401PAEN Conn. Header, 2.54mm zip Sullins Electronics
Table 23: AAT2400 Evaluation Board Component Listing.
Component Part Number Description Manufacturer
U2 AAT2401IIH 8 channel white LED driver with current and timing
control (Slave); 36 pin, 5x5 TQFN package Skyworks
R7 Chip Resistor 6.04kΩ, 1%, 1/4W; 0603 Vishay
R8 Chip Resistor 12kΩ, 1%, 1/4W; 0603 Vishay
R9 Chip Resistor 2kΩ, 5%, 1/4W; 0603 Vishay
R10 Chip Resistor 10kΩ, 5%, 1/4W; 0603 Vishay
C8 GRM31CR71H475K 4.7µF, ±10%, 50V, X7R, 1206, 1.6mm MuRata
C9, C10 GRM185R60J225KE26 2.2µF, ±10%, 6.3V, X5R, 0603, 0.5mm MuRata
C11 GRM188R71A684KA61D 0.68uF, ±10%, 10V, X7R, 0603, 0.8mm MuRata
C12 GRM188R60J106M 10µF, ±10%, 6.3V, X5R, 0603, 0.8mm MuRata
D3 LTST-C190CKT Red LED; 0603 Lite-On Inc.
JTAG2 HRP10H-ND Low prole 5x2 Conn. Header, 2.54mm Assmann
Table 24: AAT2401 Evaluation Board Component Listing.
Component Part# Description Manufacturer
LED SSC-ZWT715 60mA LCD Backlighting LED Seoul Semiconductor
Cable H3CCS--1006G-ND Double Ended Socket Cable Assmann
Table 25: Component Listing for LED Board.
29
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Register Summary Table
Name Addr Default D7 D6 D5 D4 D3 D2 D1 D0
DOT1 00h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT2 02h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT3 04h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT4 06h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT5 08h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT6 0Ah 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT7 0Ch 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT8 0Eh 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT9 10h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT10 12h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT11 14h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT12 16h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT13 18h 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT14 1Ah 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT15 1Ch 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DOT16 1Eh 7Fh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS1 LSB 40h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS1 MSB 42h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS2 LSB 44h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS2 MSB 46h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS3 LSB 48h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS3 MSB 4Ah 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS4 LSB 4Ch 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS4 MSB 4Eh 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS5 LSB 50h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS5 MSB 52h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS6 LSB 54h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS6 MSB 56h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS7 LSB 58h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS7 MSB 5Ah 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS8 LSB 5Ch 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS8 MSB 5Eh 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS9 LSB 60h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS9 MSB 62h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS10 LSB 64h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS10 MSB 66h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS11 LSB 68h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS11 MSB 6Ah 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS12 LSB 6Ch 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS12 MSB 6Eh 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS13 LSB 70h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS13 MSB 72h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS14 LSB 74h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS14 MSB 76h 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS15 LSB 78h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS15 MSB 7Ah 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
GS16 LSB 7Ch 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GS16 MSB 7Eh 04h x x x x Bit 11 Bit 10 Bit 9 Bit 8
30
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Register Summary Table (continued)
Name Addr Default D7 D6 D5 D4 D3 D2 D1 D0
DLY1 LSB 80h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY1 MSB 82h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY2 LSB 84h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY2 MSB 86h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY3 LSB 88h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY3 MSB 8Ah 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY4 LSB 8Ch 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY4 MSB 8Eh 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY5 LSB 90h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY5 MSB 92h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY6 LSB 94h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY6 MSB 96h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY7 LSB 98h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY7 MSB 9Ah 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY8 LSB 9Ch 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY8 MSB 9Eh 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY9 LSB A0h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY9 MSB A2h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY10 LSB A4h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY10 MSB A6h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY11 LSB A8h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY11 MSB AAh 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY12 LSB ACh 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY12 MSB AEh 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY13 LSB B0h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY13 MSB B2h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY14 LSB B4h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY14 MSB B6h 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY15 LSB B8h 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY15 MSB BAh 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
DLY16 LSB BCh 00h Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DLY16 MSB BEh 00h x x x x Bit 11 Bit 10 Bit 9 Bit 8
CTL1 C0h 00h CS8 ON CS7 ON CS6 ON CS5 ON CS4 ON CS3 ON CS2 ON CS1 ON
CTL2 C2h 00h CS16 ON CS15 ON CS14 ON CS13 ON CS12 ON CS11 ON CS10 ON CS9 ON
Fault1 E0h 00h CS4 CS4 CS3 CS3 CS2 CS2 CS1 CS1
Fault2 E2h 00h CS8 CS8 CS7 CS7 CS6 CS6 CS5 CS5
Fault3 E4h 00h CS12 CS12 CS11 CS11 CS10 CS10 CS9 CS9
Fault4 E6h 00h CS16 CS16 CS15 CS15 CS14 CS14 CS13 CS13
OTMP1 E8h 00h x x x x x cong Bit 1 Bit 0
OTMP2 EAh 00h x x x x x cong Bit 1 Bit 0
Fault Reporting 1 F0h AAh CS4 CS4 CS3 CS3 CS2 CS2 CS1 CS1
Fault Reporting 2 F2h AAh CS8 CS8 CS7 CS7 CS6 CS6 CS5 CS5
Fault Reporting 3 F4h AAh CS12 CS12 CS11 CS11 CS10 CS10 CS9 CS9
Fault Reporting 4 F6h AAh CS16 CS16 CS15 CS15 CS14 CS14 CS13 CS13
Test Modes FEh 00h TM7 TM6 TM5 TM4 TM3 TM2 TM1 TM0
31
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN, and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Ordering Information
Package Marking1Part Number (Tape and Reel)2
TQFN55-36 7WXYY AAT2400IIH-T1
TQFN55-36 7XXYY AAT2401IIH-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
TQFN55-363
0.750 ± 0.050
0.000 + 0.050
- 0.000
0.203 REF
0.200 ± 0.050
0.450 ± 0.050
0.40 BSC
5.000 ± 0.050
5.000 ± 0.050
3.600 ± 0.050
Detail "A"
3.600 ± 0.050
Top View
Side View
Detail "A"
Bottom View
Index Area
(D/2 x E/2)
R = 0.1
C = 0.3
All dimensions in millimeters.
32
AA
T2400/2401
DATA SHEET
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky-
works may change its documentation, products, services, specications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conicts, incompatibilities, or other difculties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here-
under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES
NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN-
CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en-
vironmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specications as a result of design defects, errors, or operation of products outside of pub-
lished parameters or design specications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identication purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
