DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control General Description Features 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. * 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 * -40C to +85C Temperature Range A SPI compatible interface operates up to 30MHz, allowing fast, independent digital control of each current sink. Full scale LED current is programmed from 30mA to 100mA using an external resistor. LED brightness variation is compensated by setting relative current sink magnitudes 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 provides 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 reported 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 requirement allowing a wide range of LED characteristics, while maintaining the lowest possible power dissipation. The boost switching frequency is 600kHz to allow for optimum 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. Applications * Large Size LCD TV, Panels * White LED Backlight The AAT2400 and AAT2401 are available in Pb-free, thermally enhanced 36-pin 5x5mm TQFN packages. 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Typical Application Circuit L1 10H VIN 24V D1 60V 3A LX EN VIN VCC VCCIO 2.2F 2.2F 4.7F AAT2400 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8 RSET 0.68F 10F 2k R1 OVP 12.1K 18nF 12.1K 4.7F 50V 442K SYNC SCLK SDI CS SDO ADDR0 ADDR1 VSYNC GSCLK PLL CSFB COMP SPI VOUT VCC 2K FAULT PGND AGND SGND DGND VIN 24V EN VIN VCC VCCIO 2.2F 2.2F 4.7F OVP SCLK SDI CS SDO ADDR0 ADDR1 VSYNC GSCLK CSFBI SPI PLL 12.1K 10F 2 0.68F AAT2401 RSET R7 CS9 CS10 CS11 CS12 CS13 CS14 CS15 CS16 VCC 2K FAULT CSFBO PGND AGND SGND DGND 10K 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control AAT2400 Pin Descriptions Pin # Symbol Function 1 2 3 4 5 6 7 8 9 CS5 CS6 CS7 CS8 SGND CS4 CS3 CS2 CS1 O O O O GND O O O O 10 RSET I 11 EN I 12 13 14, 32 15 16 17 FAULT PLL AGND DGND VIN VCC O I/O GND GND I I/O 18 VCCIO I/O 19 20 21 22 23 SDO COMP CSFB SYNC N/C O I I I 24, 25 LX O 26, 27 PGND GND 28 29 30 31 33 34 35 36 ADDR1 ADDR0 VSYNC GSCLK SCLK SDI CSB OVP I I I I I I I I EP Description Output current sink 51. Output current sink 61. Output current sink 71. Output current sink 81. Current sink ground. Connect to GND as closely as possible to the device. Output current sink 41. Output current sink 31. Output current sink 21. Output current sink 11. Resistor for setting maximum current sink DC level. Connect a resistor between this pin and AGND pin. 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. Open drain fault signal. Pull up to logic supply with external resistor. PLL compensation. Connect associated network between this pin and AGND. Analog ground. Connect to GND with one single connection. Digital ground. Connect to GND as closely as possible to the device. IC and boost converter power supply. Internally regulated power supply. Decouple with 2.2F/6.3V capacitor to AGND. Internally regulated power supply (3.3V) for SDO. Decouple with 2.2F/6.3V capacitor to DGND. SPI interface serial data output. Boost converter compensation. Connect external resistor and capacitor to this pin and AGND. Current sink feedback. Connect to slave device CSFBO with a 10k pull-down resistor. Connect to an external clock for synchronization Connect to PGND if not used. No connect Switching node of boost converter. Connect a 10H inductor between this pin and VIN. Connect a Schottky diode between this pin and the boost output capacitor. Power ground of boost converter integrated NMOS switching device. Boost output capacitor must be placed very close to this pin. MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address. LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address. Vertical sync. PWM operation synchronization and reset. PWM clock. Apply clock or connect to GND if not used. SPI interface serial clock. SPI interface serial data input. SPI interface active low chip select. Over-voltage protection pin. Connect resistive divider between VOUT and GND. Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain acceptable junction temperature. 1. Unused current sink channels must be terminated. Refer to the Channel Disable paragraph in the Application Information section of this datasheet. 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 3 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control AAT2401 Pin Descriptions Pin # Symbol Function 1 2 3 4 5 6 7 8 9 CS5 CS6 CS7 CS8 SGND CS4 CS3 CS2 CS1 O O O O GND O O O O 10 RSET I 11 EN I 12 13 14, 32 15 16 17 FAULT PLL AGND DGND VIN VCC O I/O GND GND I I/O 18 VCCIO I/O 19 20, 22, 24, 25, 26, 27 SDO O AGND GND 21 CSFBO O 23 28 29 30 31 33 34 35 36 CSFBI ADDR1 ADDR0 VSYNC GSCLK SCLK SDI CSB OVP I I I I I I I I I EP Description Output current sink 51. Output current sink 61. Output current sink 71. Output current sink 81. Current sink ground. Connect to GND as closely as possible to the device. Output current sink 41. Output current sink 31. Output current sink 21. Output current sink 11. Resistor for setting maximum current sink DC level. Connect a resistor between this pin and AGND pin. Logic high enable pin. Apply a logic high voltage after power is applied to the VIN. Or connect to VIN through a RC time delay network to enable the device. Open drain fault signal. Pull up to logic supply with external resistor. PLL compensation. Connect associated network between this pin and AGND. Analog ground. Connect to GND with one single connection. Digital ground. Connect to GND as closely as possible to the device. IC and boost converter power supply. Internally regulated power supply. Decouple with 2.2F/6.3V capacitor to AGND. Internally regulated power supply (3.3V) for SDO. Decouple with 2.2F/6.3V capacitor to DGND. SPI interface serial data output. Connect to GND with one single connection. Current sink feedback output. Connect to master device CSFB with a 10k pull-down resistor Current sense feedback input. Connect to VCC if not used. MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address. LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address. Vertical sync. PWM operation synchronization and reset. PWM clock. Apply clock or connect to GND if not used. SPI interface serial clock. SPI interface serial data input. SPI interface active low chip select. Over-voltage protection pin. Connect resistive divider between VOUT and GND. Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain acceptable junction temperature. 1. Unused current sink channels must be terminated. Refer to the Channel Disable paragraph in the Application Information section of this datasheet. 4 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Pin Configuration AAT2400 TQFN55-36 (Top View) AAT2401 TQFN55-36 (Top View) CS5 CS6 CS7 CS8 SGND CS4 CS3 CS2 CS1 35 34 33 32 31 30 29 ADDR1 ADDR0 VSYNC GSCLK AGND SCLK SDI CSB OVP ADDR1 ADDR0 VSYNC GSCLK AGND SCLK SDI CSB OVP 36 28 36 1 27 2 26 3 25 4 24 5 23 6 22 7 21 8 20 9 19 10 11 12 13 14 15 16 17 PGND PGND LX LX N/C SYNC CSFB COMP SDO 18 CS5 CS6 CS7 CS8 SGND CS4 CS3 CS2 CS1 35 34 33 32 31 30 29 28 1 27 2 26 3 25 4 24 5 23 6 22 7 21 8 20 9 19 10 11 12 13 14 15 16 17 AGND AGND AGND AGND CSFB1 AGND CSFBO AGND SDO 18 VCCIO VCC VIN DGND AGND PLL FAULT EN RSET VCCIO VCC VIN DGND AGND PLL FAULT EN RSET Absolute Maximum Ratings1 TA = 25OC unless otherwise noted. Symbol Description VLX VIN,EN VCSx VCC OVP, COMP, SYNC, VSYNC, GSCLK, RSET, SDI, SDO, SCLK, CS B, PLL, FLAUT, CSFB, CSFBi, CSFBo, ADDR0, ADDR1 IOUT TJ TLEAD LX Voltage to GND Input Voltage, EN to GND Output current sinks CS1 - CS16 to GND Low Voltage Pin to GND OVP, COMP, SYNC, VSYNC, GSCLK, RSET, SDI, SDO, SCLK, CS B, PLL, FLAUT, CSFB, CSFBi, CSFBo, ADDR0, ADDR1 Voltage to GND Maximum DC Output Current2 Maximum Junction Operating temperature Maximum Soldering Temperature (at leads, 10 sec) Value Units 45 -0.3 to 30 -0.3 to 35 -0.3 to 6.0 V -0.3 to V CC + 0.3 1800 -40 to +150 300 mA Value Units C Thermal Information3 Symbol JA PD Description Thermal Resistance Maximum Power Dissipation 4 23 4.3 O C/W W 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 25C. 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 5 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Electrical Characteristics1 VIN=24V; CIN = 4.7F, COUT = 4.7F; CVCC = 2.2F; L1 = 10H; RSET =10.2k (ICSx = 60mA); TA = -40oC to 85oC unless otherwise noted. Typical values are at TA = 25oC. Symbol Description Conditions Power Supply, Current Sinks VIN Input Voltage Range VUVLO VOUT IQ_2400 IQ_2401 ISD IEN_LEAKAGE IADDR0, IADDR1 VOVP RDS(ON)LO ILIMIT FOSC FSYNC TSS ICSx / IRSET Under-Voltage Threshold Output Voltage Range Quiescent Current of AAT2400 (no switching) Quiescent Current of AAT2401 VIN Pin Shutdown Current Enable Leakage Current Input Current to ADDR0 and ADDR1 Over-Voltage Threshold Over-Voltage Hysteresis Low Side Switch On-Resistance Low Side Switch Current Limit Oscillator Frequency Sync Frequency Soft-Start Current Set Ratio VCx Current Sink Voltage ICSx Current Sink Accuracy Current Matching Between Any Sink Channel ICSx-Matching VCx(SHORT) Shorted Diode(s) Detection Threshold Typ 10.8 VIN Rising Hysteresis VIN Falling VIN = 10.8 to 28.0V Max Units 28.0 10 V V mV V V 500 8.5 VIN + 3V 40 ICSx = 0mA, VCSx = 1V 3 mA ICSx = 0mA, VCSx = 1V CSn = IN, EN = Logic Low; includes CSx + LX leakage current EN = 5V ADDR0 = 5V, ADDR1 = 5V VOUT Rising VOUT Falling 5 mA 25 A 1.1 4.5 500 300 VOUT = 35V ICSx/IRSET, VRSET = 0.6V nom, Full Scale Dot Correction EN = Logic High, ICSx = 60mA (RSET = 10.2k) ICSx = 60mA ICSx= 60mA 1 A A V mV m A kHz kHz ms 1024 A/A 0.8 V 1.2 100 180 600 5 100 1.3 6.5 700 900 -2.5 +2.5 % -2 +2 % 0.4 V V V ICSx= 60mA Logic Level Inputs: EN, SYNC, VSYNC, GSCLK, SDI, SCLK, CSB VI(L) Input Logic Threshold Low VI(H) Input Logic Threshold High VI(H)_EN Enable Logic Threshold High 6 Min 3V 1.4 2.5 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Electrical Characteristics1 VIN=24V; CIN = 4.7F, COUT = 4.7F; CVCC = 2.2F; L1 = 4.2H; RSET =10.2k (ICSx = 60mA); TA = -40oC to 85oC unless otherwise noted. Typical values are at TA = 25oC. Symbol Description Logic Level Outputs: SDO, FAULT VCCIO VCC I/O Voltage Range VO(H) Output Logic Level High VO(L) Output Logic Level Low VFAULTLOW FAULT Logic Output Low ISINK FAULT Logic Hi Leakage Interface: VSYNC, GSCLK FVSYNC VSYNC Maximum Frequency FGSCLK GSCLK Frequency tSETUP(SU_VS) Minimum VSYNC Setup Time tHOLD(H_VS) Minimum VSYNC Hold Time TGS(HI/LO_ MIN) Minimum GSCLK Clock High/Low Time tSCLK(HI/LO_ MIN) Minimum SCLK Clock High/Low Time tVS(HI/LO_ MIN) Minimum VSYNC Clock High/Low Time SPI Interface: SDI, SDO, SCLK, CSB FMAX Maximum Clock Frequency tSETUP(SU_ SDI) Minimum SDI Setup Time tSETUP(SU_CS) Minimum CSB Setup Time tHOLD(H_ SDI) Minimum SDI Hold Time Thermal Protection TJ2(SD) TJ Thermal Shutdown Threshold TJ2(HYS) TJ Thermal Shutdown Hysteresis TJ1(SD) TJ Thermal Warning Threshold TJ1(HYS) TJ Thermal Warning Hysteresis Conditions No Load ISOURCE = 4mA, VCCIO = 3.3V ISINK = -4mA Min Typ Max Units 2.97 2.4 3.3 3.63 V V V V A 0.4 0.4 1 VFAULT = 5.5V 55 GSCLK, VSYNC GSCLK, VSYNC SDI, SCLK CSB, SDI SDI, SCLK Reset Thermal Threshold CTL1 and CTL2 Registers are Reset to 0 Warning Thermal Threshold 1 24 24 32 32 32 250 Hz MHz ns ns ns ns ns 30 24 24 24 MHz ns ns ns 140 15 120 15 C C C C 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 7 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control SPI Timing Diagram CSB SCLK SDI / SDO tSETUP(SU-CS) 8 tSETUP(SU-SDI) t HOLD(H-SDI) 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Typical Characteristics AAT2400 Boost Converter Efficiency vs. Output Current LED Current vs. Input Voltage (60mA/ch) (VOUT = 38V) 60.20 60.15 VIN = 26V VIN = 24V VIN = 22V 96 94 LED Current (mA) Efficiency (%) 98 92 90 88 60.05 60.00 59.95 59.90 59.85 59.80 86 0.0 60.10 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 21.6 22.4 Output Current (A) Shutdown Current (A) Quiescent Current (mA) 8 7 6 5 4 3 2 1 -15 10 35 60 20 15 10 5 -15 35 60 85 AAT2400 Boost Converter Low Side On-Resistance vs. Temperature 63 62 61 60 59 58 57 56 60 85 Low Side On Resistance (m) Output Current (mA) 10 Temperature (C) 64 Temperature (C) 28.0 25 0 -40 85 65 35 27.2 30 (60mA/ch) 10 26.4 35 Output Current Matching vs. Temperature -15 25.6 (VIN = 24V) 40 Temperature (C) 55 -40 24.8 Sum of AAT2400 and AAT2401 Shutdown Current vs. Temperature (VIN = 24V) 0 -40 24.0 Input Voltage (V) Sum of AAT2400 and AAT2401 Quiescent Current vs. Temperature 9 23.2 350 300 250 200 150 100 50 0 -40 -15 10 35 60 85 Temperature (C) 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 9 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Typical Characteristics Switching Frequency (kHz) Switching Frequency vs. Temperature Turn On (VIN = 24V; 50mA/ch) 640 630 SDI (2V/div) 620 610 VOUT (10V/div) VSINK (5V/div) 600 590 580 IOUT (500mA/div) 570 560 -40 -15 10 35 60 0V 24V 800mV 0mA 85 Temperature (C) Time (1ms/div) UVLO Falling vs. Temperature Turn Off (VIN = 24V; 50mA/ch) 10.0 VOUT (10V/div) VSINK (10V/div) IOUT (500mA/div) 9.8 UVLO Falling (V) SDI (2V/div) 0V 34V 800mV 9.6 9.4 9.2 9.0 8.8 8.6 0mA 8.4 -40 -15 Time (1ms/div) UVLO Rising vs. Temperature 60 85 (VIN = 12V) 3.60 9.8 85C 25C -40C 3.50 9.6 9.4 VCCIO (V) UVLO Rising (V) 35 VCCIO vs. IVCCIO 10.0 9.2 9.0 3.40 3.30 3.20 8.8 3.10 8.6 8.4 -40 -15 10 35 Temperature (C) 10 10 Temperature (C) 60 85 3.00 0 10 20 30 40 ICC (mA) 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 50 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Functional Block Diagram AAT2400 (master) LX VIN FAULT Linear Regulator VCCIO VCC PWM Logic PGND Temperature Detect ADDR0 ADDR1 7-bit Dot Correction Fault Condition Reporting SPI Interface SCLK SDI CSB SDO 16 7-bitDot DotCorrection Correction 7-bit 7-bit DotCorrection Correction 7-bit Dot 7-bit Dot Correction 7-bitDot DotCorrection Correction 7-bit 8-bit Dot Correction 7-bitDot DotCorrection Correction 7-bit 7-bit DotCorrection Correction 7-bit Dot 7-bit Dot Correction 7-bit Dot Correction 7-bit Correction 12-bitDot Delay Time 7-bitDot DotCorrection Correction 7-bit 7-bit DotCorrection Correction 7-bit Dot 7-bit Dot Correction 7-bit Dot Correction 7-bitGray Dot Scale Correction 12-bit PWM VSYNC PLL GSCLK CS8 CS7 CS6 CS5 CS4 CS3 CS2 CS1 Vfb Fault Detect EN OVP COMP SYNC CSFB 8x31 Control Control Control Control Control Control Control Control 8 4096 x PLL Mux RSET DGND AGND SGND 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 11 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control AAT2401 (slave) FAULT VIN CSFBO CSFB Linear Regulator VCCIO VCC Vfb Fault Detect EN OVP Temperature Detect ADDR0 ADDR1 7-bit Dot Correction Fault Condition Reporting SPI Interface SCLK SDI CSB SDO 16 7-bitDot DotCorrection Correction 7-bit 7-bit DotCorrection Correction 7-bit Dot 7-bit Dot Correction 7-bit Dot Correction 7-bitDot DotCorrection Correction 8-bit 7-bitDot DotCorrection Correction 7-bit 7-bit DotCorrection Correction 7-bit Dot 7-bit Dot Correction 7-bit Dot Correction 7-bit Correction 12-bitDot Delay Time 7-bitDot DotCorrection Correction 7-bit 7-bit DotCorrection Correction 7-bit Dot 7-bit Dot Correction 7-bitDot DotCorrection Correction 7-bit 12-bit Gray Scale PWM VSYNC PLL GSCLK CSFBI CS16 CS15 CS14 CS13 CS12 CS11 CS10 CS9 8x31 Control Control Control Control Control Control Control Control 8 4096 x PLL Mux RSET DGND 12 AGND SGND 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Functional Description Soft Start / Enable The AAT2400 consists of a high efficiency DC/DC boost controller, an integrated slew rate controlled input disconnect MOSFET switch, and a MOSFET power switch. A high voltage rectifier, power inductor, output capacitor, feedback compensation network, and OVP resistor divider network are required to implement a DC/DC boost converter. 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 guaranteed by the built-in soft-start circuitry, which eliminates output current overshoot across the full input voltage range and over all load conditions. 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 external 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 control with a simple feedback loop. The device maintains exceptional DC regulation, transient response, and cycleby-cycle current limit with additional RC compensation components. The AAT2400 modulates the power MOSFET switching current in response to changes in output voltage (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 interval, 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 controller implements a programmed current source connected to the output capacitor and load resistor. There is no right-half plane zero, and loop stability is achieved with simple RC compensation components. 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 overload 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 temperature to reach the thermal limit threshold (140C, nominal). 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 threshold 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. 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 13 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Current Sink Control Each current sink has an independent property programmed by the following registers. The AAT2400 contains current sinks 1 through 8. The AAT2401 contains current sinks 9 through 16. 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 Dot Correction Bit Each current sink can have a separate current setting to compensate for relative LED brightness. This register has a default setting of half scale. 7:0 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. ADDR: 40h to 7Eh Bit Name GSn 7:0 ADDR: 40h to 7Eh 3:0 Default 00h Access Description R/W 8 LSBs of 12-bit GS word 00h ADDR: 80h to BEh Access Description R/W 8 LSBs of 12-bit GS word DLYn MSB: Delay Setting MSB Bit Bit Name Default Access Description 3:0 DLYn 11:8 00h R/W 4 MSBs of 12bit GS word Current Sink ON/OFF Each current sink can be independently enabled or disabled. 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). Bit Name GSn 11:8 Default 04h Access Description R/W 4 MSBs of 12-bit GS word 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. 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 CTL2: This Register Enables or Disables Each Current Sink Independently ADDR: C2h Bit Delay CTL1: This Register Enables or Disables Each Current Sink Independently ADDR: C0h GSn MSB: Gray Scale Setting MSB Table 3: Gray Scale Setting MSB. 14 DLYn 7:0 GSn LSB: Gray Scale Setting LSB Table 2: Gray Scale Setting LSB. Bit Default Table 5: Delay Setting MSB. 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 1/2 scale, or 0400h. Only even register addresses are used starting from 40h to 7Eh. 7:0 Bit Name Table 4: Delay Setting LSB. Gray Scale Bit DLYn LSB: Delay Setting LSB 7:0 Bit Name CS16:CS9 Default 00h Access Description R/W 0 = current sink OFF, 1= current sink ON Table 7: CTL2 Setting. 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control 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 500s. 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 programmed with the same device address. The register addressing will automatically select the appropriate master/slave device for the addressed current sink. T VSYNC VSYNC 1 4096 GSCLK TDLY TPWM PWM Figure 1: PWM Timing Diagram. Device Address SPI Address: Addr1 Addr0 Decoding of Address Set Resistors Bit Bit Name Description 1:0 3:2 ADDR0 ADDR1 00: connect to VCC; 01: OPEN; 10: connect to SDI; 11: connect to GND 00: connect to VCC; 01: OPEN; 10: connect to SDI; 11: connect to GND Table 8: Device Address Settings. 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 15 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Configuration Bits ADDR1 ADDR0 6 5 4 3 2 1 0 W Address (Hex) VCC VCC VCC VCC OPEN OPEN OPEN OPEN SDI SDI SDI SDI GND GND GND GND VCC OPEN SDI GND VCC OPEN SDI GND VCC OPEN SDI GND VCC OPEN SDI GND 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A0 A2 A4 A6 A8 AA AC AE B0 B2 B4 B6 B8 BA BC BE Table 9: Device Address Write Table and Configuration. Configuration Bits ADDR1 ADDR0 6 5 4 3 2 1 0 R Address (Hex) VCC VCC VCC VCC OPEN OPEN OPEN OPEN SDI SDI SDI SDI GND GND GND GND VCC OPEN SDI GND VCC OPEN SDI GND VCC OPEN SDI GND VCC OPEN SDI GND 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 A1 A3 A5 A7 A9 AB AD AF B1 B3 B5 B7 B9 BB BD BF Table 10: Device Address Read Table and Configuration. 16 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control 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 ontimes of greater than 10s. An over-temperature condition 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 ADDR: E2h Bit 1:0 3:2 5:4 7:6 Bit 1:0 3:2 5:4 7:6 Bit Name CS1 Fault CS2 Fault CS3 Fault CS4 Fault CS5 Fault CS6 Fault CS7 Fault CS8 Fault ADDR: E4h Bit 1:0 3:2 5:4 7:6 Bit Name CS9 Fault CS10 Fault CS11 Fault CS12 Fault ADDR: E6h Default Access Bit 00h R 00h R 00h R 00h R 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short Table 11: Fault1 Register Settings. open, open, open, open, Access 00h R 00h R 00h R 00h R Description 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short open, open, open, open, Fault3: This Register Reports Fault Conditions And High Voltage CS Pins Default Access 00h R 00h R 00h R 00h R Description 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short open, open, open, open, Table 13: Fault3 Register Settings. Fault1: This Register Reports Fault Conditions And High Voltage CS Pins Description Default Table 12: Fault2 Register Settings. The fault registers can be read anytime during operation. ADDR: E0h Bit Name Fault2: This Register Reports Fault Conditions and High Voltage CS Pins 1:0 3:2 5:4 7:6 Bit Name CS13 Fault CS14 Fault CS15 Fault CS16 Fault Fault4: This Register Reports Fault Conditions and High Voltage CS Pins Default Access 00h R 00h R 00h R 00h R Description 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short 00: no fault, 01: 10: short open, open, open, open, Table 14: Fault4 Register Settings. 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 17 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Temperature Fault Conditions Fault Reporting Registers 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 levels 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 disables 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 configuration registers must be reprogrammed, since data retention at the maximum temperature is not guaranteed. 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: E8h Bit Bit Name Fault Reporting 1: Individual Sink Fault Reporting Default Access OTMP1: Reports the Temperature Condition of the Master IC (CS8 to CS1) 1:0 CS1 Fault 10h R/W Description 3:2 CS2 Fault 10h R/W 00: Tj < T1 01: T1 < Tj < T2 11: T2 < Tj 0: Report T1 and T2 Thermal Limits on Fault pin 1: Report only T2 Thermal Limit on Fault pin 5:4 CS3 Fault 10h R/W 7:6 CS4 Fault 10h R/W Bit Bit Name Default Access 1:0 OTMP 1 00h R 2 Config 0h R/W Table 15: OTMP1 Settings. OTMP2: Reports the Temperature Condition of the Slave IC (CS16 to CS9) ADDR: EAh ADDR: F0h Bit Bit Name Default Access 1:0 OTMP 2 00h R 2 Config 0h R/W Description 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. Table 17: Fault Reporting Register 1 Settings. Description 00: Tj < T1 01: T1 < Tj < T2 11: T2 < Tj 0: Report T1 and T2 Thermal Limits on Fault pin 1: Report only T2 Thermal Limit on Fault pin Table 16: OTMP2 Settings. 18 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Fault Reporting 2: Individual Sink Fault Reporting ADDR: F2h Bit Bit Name Default Access 1:0 CS5 Fault 10h R/W 3:2 CS6 Fault 10h R/W 5:4 CS7 Fault 10h R/W 7:6 CS8 Fault 10h R/W Description 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. Table 18: Fault Reporting Register 2 Settings. Fault Reporting 3: Individual Sink Fault Reporting ADDR: F4h Bit Bit Name Default Access 1:0 CS9 Fault 10h R/W 3:2 CS10 Fault 10h R/W 5:4 CS11 Fault 10h R/W 7:6 CS12 Fault 10h R/W Description 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. Table 19: Fault Reporting Register 3 Settings. ADDR: F6h Bit Bit Name Fault Reporting 4: Individual Sink Fault Reporting Default Access 1:0 CS13 Fault 10h R/W 3:2 CS14 Fault 10h R/W 5:4 CS15 Fault 10h R/W 7:6 CS16 Fault 10h R/W Description 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 00: report both; 01: report short only; 10: report open only; 11: report none. 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 microcontrollers. 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. 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 19 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control SPI Single-Byte Write CS SCLK 7-Bit Device Address "1" SDI "0" "1" A3 A2 A1 W A0 "0" 8-Bit Register Address R7 R6 R5 R4 R3 R2 8-Bit Data written in R1 R0 R1 R0 D7 D6 D5 D4 D3 D2 D1 D0 High Impedance SDO SPI Single-Byte Read CS SCLK 7-Bit Device Address SDI "1" "0" "1" A3 A2 A1 R A0 "1" 8-Bit Register Address R7 R6 R5 R4 R3 R2 High Impedance or don't care 8-Bit Data read out High Impedance SDO D7 D6 D5 D4 D3 D2 D1 D0 SPI Multi-Byte Write Transfer CS SCLK SDI Device Addr & W Register Address Data Byte n Data Byte n+1 Data Byte n+m High Impedance SDO SPI Multi-Byte Read Transfer CS SCLK SDI SDO 20 Device Addr & R High Impedance High Impedance or don't care Register Address Data Byte n Data Byte n+1 Data Byte n+m 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Application Information prevents damage to the device when one of the 16 channels has an open LED circuit. The rest of the channels of AAT2400 and AAT2401 continue to operate. 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. The resistor divider can be selected such that the overvoltage threshold occurs prior to the output reaching 45V (VOUT(MAX)). The value of R5 should be selected from 10k to 20k to minimize switching losses without degrading noise immunity. R4 = R5 VOUT(PROTECTION) -1 VOVP 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-toLED brightness will be matched regardless of the individual LED forward voltage (VF) levels. It makes the AAT2400 and 2401 a perfect combination for large LCD TV backlighting LED applications. VOUT AAT2400 R4 C OUT OVP R5 AGND Constant Current Setting The LED current is controlled by the RSET resistor. For maximum accuracy, a 1% tolerance resistor is recommended. Table 21 shows the RSET resistor value for AAT2400 and 2401 for various LED full-scale current levels. RSET = 1024(A/A) * 0.6V ICSx ICSX (mA) RSET (k) 40 50 60 70 80 90 100 15.4 12.3 10.2 8.76 7.68 6.81 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 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 = 12.1k and setting VOUT(PROTECTION) = 45V is recommended. Selecting a 1% resistor, this results in R4 = 442k (rounded to the nearest standard 1% value). It is always recommended to use the same number 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 trueblack and a true-white from the LED technology. 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 21 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control 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 recovery, high voltage Schottky diodes are recommended for the AAT2400 boost converter. The output diode is selected to maintain acceptable efficiency and reasonable operating junction temperature under full load operating conditions. Forward voltage (VF) and package thermal resistance (JA) are the dominant factors in selecting a diode. The diode non-repetitive peak forward surge current rating (IFSM) should be considered for high pulsed load applications. IFSM rating drops with increasing conduction period. 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: D= tON = tON * FS tON + tOFF 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)): DMAX = VOUT - VIN(MIN) VOUT The average diode current during the OFF time can be estimated: IAVG(OFF) = IOUT 1 - DMAX 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: IAVG(TOT) = IOUT 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 comparative measure between similarly rated devices. The average output current multiplied by the forward diode voltage determines the loss of the output diode: 60V/3A rated Schottky diodes are recommended for output voltages less than 45V (total VF and 100mA/sink application). For continuous LED currents, the diode junction temperature can then be estimated: Estimating Schottky Diode Power Dissipation The switching period is divided between ON and OFF time intervals: 1 = tON + tOFF = D + D FS 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 22 PLOSS(DIODE) = IAVG(TOT) * VF = IOUT * VF TJ(DIODE) = TAMB + JA * PLOSS(DIODE) External Schottky diode junction temperature should be below 110C, and may vary depending on application and/or system guidelines. The diode JA can be minimized 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 efficiency under light load. The rectifier reverse current increases dramatically at elevated temperatures. 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Manufacturer Part Number Rated Foward Current (A) Rated Voltage (V) Thermal Resistance, JA, (C/W) Case Diode, Inc. ON Semi B360A MBRD360 3A 3A 60 60 100 80 SMA DPAK Table 22: Typical Surface Mount Schottky Rectifiers for Various Output Loads (select TJ < 110C in Application Circuit). Selecting the Boost Inductor The AAT2400 controller utilizes PWM control and the switching frequency is fixed. To maintain 600kHz switching frequency and stable operation, a 10H inductor is recommended. Manufacturer's specifications list both the inductor DC current rating, which is a thermal limitation, and peak inductor current rating, which is determined by the saturation characteristics. Measurements at full load and high ambient temperature should be performed 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 conditions. Worst-case peak current occurs at minimum input voltage (maximum duty cycle) and maximum load. At high load the switching frequency is somewhat diminished, resulting in higher IPEAK. Bench measurements are recommended to confirm actual IPEAK and to ensure that Manufacturer Cooper Bussmann Cooper Bussmann Sumida Sumida Sumida Sumida TDK TDK Wurth Elektronik 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 conditions, 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: IRMS = IPEAK 3 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) = I2RMS * DCR Part Number Inductance (H) Saturated Rated Current (A) DCR (m) Size (mm) LxWxH Type DR1040-100-R 10 4.4 26 10.3 x 10.5 x 4.0 Shielded Drum Core DR1050-100-R 10 4.58 18 10.3 x 10.5 x 5.0 Shielded Drum Core CDR12D43RNP-100M CDR10D48MNNP-100MC CDRH10D43RNP-100NC CDRH105RNP-100NC VLF10045T-100M4R3-PF RLF12545T-100M5R1-PF WE-PD Type "LS" - 100 10 10 10 10 10 10 10 6.3 5.5 5.2 4.45 4.3 6 4.2 18 32 26.1 26 25 12.4 25 12.4 x 12.4 x 4.5 10.3 x 10.3 x 5.0 10.5 x 10.8 x 4.5 10.3 x 10.5 x 5.0 9.7 x 10.0 x 4.5 12.8 x 12.5 x 4.7 12 x 12 x 4.5 Shielded Shielded Shielded Shielded Shielded Shielded Shielded Drum Drum Drum Drum Drum Drum Drum Core Core Core Core Core Core Core Table 23: Typical Suggested Surface Mount Inductors. 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 23 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control AAT2400/2401 Input Capacitors In general, it is good design practice to place a decoupling capacitor (input capacitor) between the IN and GND pins. An input capacitor in the range of 2.2F to 10F 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 temperature 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 cathode tantalum chip capacitors or low ESR OS-CON (organic 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 voltage rating of two times the maximum operating voltage, although any voltage rating above the maximum operating 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 parasitic PCB effects (stray resistance, capacitance, and 24 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. 2. 3. 4. 5. 6. Minimize the distance from Capacitor C1 and C2's negative terminals to the PGND pins. This is especially true with output capacitor C2, which conducts high di/dt current from the output diode back to the PGND pins. Minimize the distance between L1 to D1 and switching pin SW; minimize the size of the PCB area connected to the SW pin. Maintain a ground plane and connect to the IC PGND pin(s) as well as the PGND connections of CIN and COUT. 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. 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 application. 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 maximize the heat sinking space for overall. 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 landing would help transfer heat to the PCB effectively. 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Manufacturer Part Number Capacitance (F) Voltage Rating (V) Temp Co. Case Size Murata Murata Taiyo Yuden Taiyo Yuden Murata TDK Murata Panasonic Sanyo GRM185R60J225KE26 GRM188R71A225KE15 JMK107BJ225KK-T LMK107BJ225KA-T GRM31CR61H225KA88L C3225X7R2A225K GRM31CR71H475KA12L EEV-HA1H2R2R 50CE4R7BE 2.2 2.2 2.2 2.2 2.2 2.2 4.7 2.2uF 2.2uF 6.3 10 6.3 10 50 100 50 50V 50V X5R X7R X7R X7R X5R X5R X5R Elect SMD Elect SMD 0603 0603 0603 0603 1206 1210 1206 4x4x5.4 4x4x5.4 Table 24: Typical Suggested Surface Mount Capacitors. Header1 CS1 CS3 CS5 CS7 OUT 1 3 5 7 9 CS2 CS4 CS6 CS8 OUT 2 4 6 8 10 Header2 CS9 CS11 CS13 CS15 OUT Header 5X2 1 3 5 7 9 CS10 CS12 CS14 CS16 OUT 2 4 6 8 10 Header 5X2 VIN 24V LX L1 10H VIN D1 LX OUT C7 4.7F 50V 60V/3A VOUT R4 442k JP1 1 CS13 CS14 ADDR1 36 35 CSB 34 SDI 33 SCLK 32 31 GSCLK GND 30 VSYNC 29 ADDR0 28 ADDR1 GND 27 26 GND 25 SDO GND GND GND VCC CS15 VSYNC 2 SP1 ADDR0 VCCIO 23 1 2 3 4 5 SYNC VCC 24 GND SDO SCLK SDI CSB JP5 VSYNC GND ADDR1 ADDR1 SDI GSCLK VIN CSFBI 2 4 DGND 21 1 3 AGND GND GND JP2 1 2 AGND 22 VCC GND GND JP8 SCLK GND ADDR0 SDI PLL 19 2 4 LX FAULT 20 1 3 C4 18nF R2 2k ADDR0 SDI OVP CSB SDO VCC GND JP3 C10 2.2F U2 TQFN55-36 AAT2401 EN GND PGND 27 LX 25 PGND 26 LX 24 NC 23 CSFB 21 SYNC 22 SDO 19 COMP 20 1 2 17 18 C9 2.2F GSCLK SD0 JP7 VCC1 3 ADDR1 16 CS16 28 C8 4.7F 50V VIN SGND ADDR1 ADDR0 15 GND 4 VCCIO 29 VIN 14 5 ADDR0 VSYNC 13 C11 0.68F RSET CSFBO VCC GSCLK GND 30 12 CS12 VSYNC 11 CS11 GSCLK VIN C12 10F 10 6 DGND 32 31 EN 7 AGND SCLK GND R9 2k R8 12.1k CS9 AGND 33 SDI D3 Red LED R5 12.1k CS10 SCLK CSB 8 CS5 CS6 34 SDI PLL GND 35 CSB FAULT C3 2.2F 36 OVP EN R7 6.04k VCC1 9 U1 TQFN55-36 AAT2400 1 2 18 C2 2.2F CS7 17 VCC 3 16 CS8 GND C1 4.7F 50V SGND 15 5 14 RSET 4 C5 0.68F C6 10F CS4 13 CS3 12 R3 12.1k R6 2k 6 11 7 10 EN CS2 GND D2 Red LED CS1 VCC 9 R1 6.04k 8 3 2 1 Enable GND JP9 1 2 VCC1 CSFBi JP4 1 2 3 CSFB R10 10k GND SDO SCLK SDI CSB JP6 1 2 3 4 5 SP1 Figure 3: AAT2400 and AAT2401 DB1 Evaluation Board Schematic. 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 25 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Figure 4: AAT2400 and AAT2401 Evaluation Board Top Side Layout. Figure 5: AAT2400 and AAT2401 Evaluation Board Middle-1 Layer Layout. 26 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Figure 6: AAT2400 and AAT2401 Evaluation Board Middle-2 Layer Layout. Figure 7: AAT2400 and AAT2401 Evaluation Board Bottom Side Layout. 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 27 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Evaluation Board Component Lists Component Part Number U1 AAT2400IIH R1 R2 R3, R5 R4 R6 C1 C2, C3 C4 C5 C6 C7 L1 D1 D2 JTAG1 JP1 - JP7 Chip Resistor Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM31CR71H475K GRM185R60J225KE26 GRM155R71H183KA12D GRM188R71A684KA61D GRM188R60J106M 50CE4R7BE RLF12545T-100M5R1-PF MBRD360G LTST-C190CKT HRP10H-ND PRPN401PAEN Description 8 channel white LED driver with current and timing control (Master); 36 pin, 5x5 TQFN package 6.04k, 1%, 1/4W; 0603 2k, 1%, 1/4W; 0603 12.1k, 1%, 1/4W; 0603 442k, 1%, 1/4W; 0603 2k, 5%, 1/4W; 0603 4.7F, 10%, 50V, X7R, 1206, 1.6mm 2.2F, 10%, 6.3V, X5R, 0603, 0.5mm 18nF, 10%, 50V, X7R, 0402, 0.5mm 0.68F, 10%, 10V, X7R, 0603, 0.8mm 10F, 10%, 6.3V, X5R, 0603, 0.8mm 4.7F 50V Aluminum Electrolytic Capacitor Shield Drum Core, 10H, 6A, 12.4m 3.0A, 60V, SMA Schottky Barrier Rectifier Red LED; 0603 Low profile 5x2 Con. Header, 2.54mm Conn. Header, 2.54mm zip Manufacturer Skyworks Vishay Vishay Vishay Vishay Vishay Murata Murata Murata Murata Murata Sanyo TDK On-Semi Lite-On Inc. Assmann Sullins Electronics Table 23: AAT2400 Evaluation Board Component Listing. Component Part Number Description U2 AAT2401IIH R7 R8 R9 R10 C8 C9, C10 C11 C12 D3 JTAG2 Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM31CR71H475K GRM185R60J225KE26 GRM188R71A684KA61D GRM188R60J106M LTST-C190CKT HRP10H-ND 8 channel white LED driver with current and timing control (Slave); 36 pin, 5x5 TQFN package 6.04k, 1%, 1/4W; 0603 12k, 1%, 1/4W; 0603 2k, 5%, 1/4W; 0603 10k, 5%, 1/4W; 0603 4.7F, 10%, 50V, X7R, 1206, 1.6mm 2.2F, 10%, 6.3V, X5R, 0603, 0.5mm 0.68uF, 10%, 10V, X7R, 0603, 0.8mm 10F, 10%, 6.3V, X5R, 0603, 0.8mm Red LED; 0603 Low profile 5x2 Conn. Header, 2.54mm Manufacturer Skyworks Vishay Vishay Vishay Vishay MuRata MuRata MuRata MuRata Lite-On Inc. Assmann Table 24: AAT2401 Evaluation Board Component Listing. Component Part# Description Manufacturer LED Cable SSC-ZWT715 H3CCS--1006G-ND 60mA LCD Backlighting LED Double Ended Socket Cable Seoul Semiconductor Assmann Table 25: Component Listing for LED Board. 28 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Register Summary Table Name Addr Default D7 D6 D5 D4 D3 D2 DOT1 DOT2 DOT3 DOT4 DOT5 DOT6 DOT7 DOT8 DOT9 DOT10 DOT11 DOT12 DOT13 DOT14 DOT15 DOT16 GS1 LSB GS1 MSB GS2 LSB GS2 MSB GS3 LSB GS3 MSB GS4 LSB GS4 MSB GS5 LSB GS5 MSB GS6 LSB GS6 MSB GS7 LSB GS7 MSB GS8 LSB GS8 MSB GS9 LSB GS9 MSB GS10 LSB GS10 MSB GS11 LSB GS11 MSB GS12 LSB GS12 MSB GS13 LSB GS13 MSB GS14 LSB GS14 MSB GS15 LSB GS15 MSB GS16 LSB GS16 MSB 00h 02h 04h 06h 08h 0Ah 0Ch 0Eh 10h 12h 14h 16h 18h 1Ah 1Ch 1Eh 40h 42h 44h 46h 48h 4Ah 4Ch 4Eh 50h 52h 54h 56h 58h 5Ah 5Ch 5Eh 60h 62h 64h 66h 68h 6Ah 6Ch 6Eh 70h 72h 74h 76h 78h 7Ah 7Ch 7Eh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h 00h 04h Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 D1 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 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 D0 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 29 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Register Summary Table (continued) Name DLY1 LSB DLY1 MSB DLY2 LSB DLY2 MSB DLY3 LSB DLY3 MSB DLY4 LSB DLY4 MSB DLY5 LSB DLY5 MSB DLY6 LSB DLY6 MSB DLY7 LSB DLY7 MSB DLY8 LSB DLY8 MSB DLY9 LSB DLY9 MSB DLY10 LSB DLY10 MSB DLY11 LSB DLY11 MSB DLY12 LSB DLY12 MSB DLY13 LSB DLY13 MSB DLY14 LSB DLY14 MSB DLY15 LSB DLY15 MSB DLY16 LSB DLY16 MSB CTL1 CTL2 Fault1 Fault2 Fault3 Fault4 OTMP1 OTMP2 Fault Reporting Fault Reporting Fault Reporting Fault Reporting Test Modes 30 1 2 3 4 Addr Default D7 D6 D5 D4 D3 D2 D1 D0 80h 82h 84h 86h 88h 8Ah 8Ch 8Eh 90h 92h 94h 96h 98h 9Ah 9Ch 9Eh A0h A2h A4h A6h A8h AAh ACh AEh B0h B2h B4h B6h B8h BAh BCh BEh C0h C2h E0h E2h E4h E6h E8h EAh F0h F2h F4h F6h FEh 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h AAh AAh AAh AAh 00h Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x Bit 7 x CS8 ON CS16 ON CS4 CS8 CS12 CS16 x x CS4 CS8 CS12 CS16 TM7 Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x Bit 6 x CS7 ON CS15 ON CS4 CS8 CS12 CS16 x x CS4 CS8 CS12 CS16 TM6 Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x Bit 5 x CS6 ON CS14 ON CS3 CS7 CS11 CS15 x x CS3 CS7 CS11 CS15 TM5 Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x Bit 4 x CS5 ON CS13 ON CS3 CS7 CS11 CS15 x x CS3 CS7 CS11 CS15 TM4 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 Bit 3 Bit 11 CS4 ON CS12 ON CS2 CS6 CS10 CS14 x x CS2 CS6 CS10 CS14 TM3 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 Bit 2 Bit 10 CS3 ON CS11 ON CS2 CS6 CS10 CS14 config config CS2 CS6 CS10 CS14 TM2 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 Bit 1 Bit 9 CS2 ON CS10 ON CS1 CS5 CS9 CS13 Bit 1 Bit 1 CS1 CS5 CS9 CS13 TM1 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 CS1 ON CS9 ON CS1 CS5 CS9 CS13 Bit 0 Bit 0 CS1 CS5 CS9 CS13 TM0 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 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Ordering Information Package Marking1 Part Number (Tape and Reel)2 TQFN55-36 TQFN55-36 7WXYY 7XXYY AAT2400IIH-T1 AAT2401IIH-T1 Skyworks GreenTM products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04-0074. Package Information TQFN55-363 R = 0.1 3.600 0.050 5.000 0.050 Index Area (D/2 x E/2) C = 0.3 5.000 0.050 3.600 0.050 0.750 0.050 0.200 0.050 0.203 REF Side View 0.450 0.050 Bottom View Top View + 0.050 0.000 - 0.000 Detail "A" 0.40 BSC Detail "A" All dimensions in millimeters. 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. 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 31 DATA SHEET AAT2400/2401 Sixteen-Channel White LED Driver Solution with Full LED Current and Timing Control Copyright (c) 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. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 32 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