AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 1
www.analogictech.com
General Description
The AAT3663 BatteryManager™ is a member of
AnalogicTech’s Total Power Management IC™ family.
This device is an integrated single/dual cell Lithium-Ion
(Li-Ion) / polymer battery charger IC designed to oper-
ate from USB ports or an AC adapter inputs up to an
input voltage of 13.2V.
AAT3663 precisely regulates battery charge voltage and
current for 4.2V and 8.4V Li-Ion battery cells. The bat-
tery charging current is user programmed up to 1A by an
external resistor.
Battery charge state is continuously monitored for fault
conditions. A Digital Thermal Loop Control maintains the
maximum possible battery charging current for the opti-
mum set of input to output power dissipation and ambient
temperature conditions. In the event of an over-current,
over-voltage, short-circuit, or over-temperature fault con-
dition, the device will automatically shut down, thus pro-
tecting the charger and the battery under charge.
Two status monitor output pins are provided to indicate
the battery charge status by directly driving external
LEDs. Additionally, an open-drain power-source detec-
tion output (ADPP#) is provided to report presence of an
input power supply
The AAT3663 is available in a thermally enhanced,
space-saving, 14-pin 3x3 mm TDFN package and is
specified for operation over the -40°C to +85°C tem-
perature range.
Features
• 4.0V ~ 13.2V Input Voltage Range
• Compatible with USB or AC Adapter Sources
•
Programmable Fast Charge Current from 100mA to 1A
• Programmable Charge Termination Current
• Digital Thermal Loop Charge Reduction
• Less Than 0.4A Battery Leakage Current
• Programming Charge Timer
• Battery Temperature Sensing
• Battery Temp Sense Open Circuit Detection
• Automatic Recharge Sequencing
• Automatic Trickle Charge for Battery Pre-Conditioning
• Automatic Charge Termination Shutdown/Sleep Mode
• Less than 1A Shutdown Current
• Over-Voltage and Over-Current Protection
• Power On Reset and Soft Start
• 3x3mm 14-pin TDFN Package
Applications
• Digital Still Cameras
• Global Positioning Systems (GPS)
• Point Of Service (POS) Terminals
• Portable DVD Players
• Portable Media Players (PMP)
• Two Way Radios
Typical Application
VIN
RTERM
ADPP#
ON/OFF
EN
TERM
GND
BAT
STAT2
RSET
ISET
IN
STAT1
CT
10μF
BATT-
Battery
Pack
BATT+
-
TEMP
CT
TS
BATS
AAT3663
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
2 3663.2008.01.1.2
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
2 3663.2008.01.1.2
www.analogictech.com
Pin Description
Pin # Symbol Type Function
1ENI
Enable pin, Active high with internal pull-down. If not used, pull high to the IN pin to continuously
enable the charger IC when input power is applied.
2CTI
Charge timer programming pin. A 0.1F ceramic capacitor should be connected between this pin
and GND. Connect directly to GND to disable the timer function.
3 ISET I Charge current programming pin. Connect a resistor between this pin and GND to program the con-
stant fast charge current.
4 GND I/O IC ground connection. Connect this pin to power ground.
5 TS I/O Battery temperature sense input. Connect the Li-Ion battery pack NTC resistor terminal to this pin.
6BATSI
Battery voltage sense pin. Connect this pin directly to the positive battery terminal. If this function
is not used, connect to the BAT pin directly.
7 BAT O Battery charge output pin. Connect to the positive battery terminal.
8, 9 IN I Power supply input pin. Connect the input USB port or Adapter power source to this pin
10 STAT1 O Charge status pin, open-drain output. Connect the STAT1 LED with a series ballast resistor between
IN and this pin.
11 STAT2 O Charge status pin, open-drain output. Connect the STAT2 LED with a series ballast resistor between
IN and this pin.
12 ADPP# O Input supply power-good status pin, open-drain output. Connect the ADPP# status LED with a series
ballast resistor between IN and this pin.
13 TERM I
Charge termination current programming input pin. Connect a resistor between this pin and GND
to program the charge termination current. When TERM is open, the termination current is 10%
(default sertting) of the set maximum charge current.
14 N/C No connection.
Pin Configuration
TDFN33-14
(Top View)
EN
ISET
GND
1
TS
BATS
BAT
N/C
ADPP#
STAT2
STAT1
IN
IN
CT 2
3
4
5
6
7
14
TERM
13
12
11
10
9
8
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 3
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 3
www.analogictech.com
Absolute Maximum Ratings1
Symbol Description Value Units
VIN IN Continuous Voltage -0.3 to 14 V
VNSTAT1, STAT2, ADPP#, EN, BAT, BATS -0.3 to VIN + 0.3 V
VNTS, CT, TERM, ISET -0.3 to 5.5 V
TJOperating Junction Temperature Range -40 to 150 °C
TLEAD Maximum Soldering Temperature (at Leads) 300 °C
Thermal Information2
Symbol Description Value Units
θJA Maximum Thermal Resistance (TDFN3x3) 50 °C/W
PDMaximum Power Dissipation 2 W
AAT3663 Feature Options
Product Number of Battery Cells Battery Temperature Sense
AAT3663-4.2-1 Single For Use With Any NTC Thermistor
AAT3663-4.2-2 Single For Use With 10k NTC Thermistor
AAT3663-8.4-1 Dual For Use With Any NTC Thermistor
AAT3663-8.4-2 Dual For Use With 10k NTC Thermistor
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. Mounted on a FR4 board.
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
4 3663.2008.01.1.2
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
4 3663.2008.01.1.2
www.analogictech.com
Electrical Characteristics
VIN = 5V, TA = -40 to +85°C; Unless otherwise noted, typical values are at TA = 25°C.
Symbol Description Conditions Min Typ Max Units
Operation
VIN Input Voltage Range 4.0 13.2 V
VUVLO
Under Voltage Lockout Threshold Rising Edge 3 4 V
UVLO Hysteresis 150 mV
VADPP_TH
Adapter Present Indicator Threshold
Voltage, VIN – VBAT
VIN > VUVLO 50 100 mV
IOP Operating Current Charge Current = 100mA 0.35 1 mA
ISHUTDOWN Shutdown Current VBAT = 4.25V, EN = GND 0.4 1 A
ILEAKAGE Leakage Current from BAT Pin VBAT = 4V, IN = Open 0.4 2 A
ENLEAKAGE EN Pin Leakage VEN = 5V 0.6 A
Voltage Regulation
VBAT_EOC End of Charge Voltage Regulation AAT3663-4.2 4.158 4.2 4.242 V
AAT3663-8.4 8.316 8.4 8.484
ΔVBAT_EOC/
VBAT_EOC
End of Charge Voltage Accuracy 0.5 %
VMIN Preconditioning Voltage Threshold AAT3663-4.2 2.5 2.6 2.7 V
AAT3663-8.4 5.0 5.2 5.4
VRCH Battery Recharge Voltage Threshold AAT3663-4.2 VBAT_EOC - 0.1 V
AAT3663-8.4 VBAT_EOC - 0.2
Current Regulation
ICC_RANGE Charge Current Programmable Range 100 1000 mA
ICH_CC
Constant-Current Mode Charge
Current
RISET = 1.74K (for 1A), VBAT = 3.6V 900 1000 1100 mA
RISET = 17.8K (for 0.1A), VBAT = 3.6V 80 100 120
VISET ISET Pin Voltage 2V
KISET Charge Current Set Factor: ICH_CC/ISET Constant Current Mode, VBAT = 3.6V 900
VTERM TERM Pin Voltage RTERM = 40kΩ0.6 V
ICH_TRK Trickle-Charge Current 51015% I
CH_CC
TERM pin open 5 10 15 % ICH_CC
ICH_TERM Charge Termination Current Threshold RTERM = 13.3 kΩ, ICH_CC 800mA 8 10 12 % ICH_CC
Charging Devices
RDS(ON) Charging Transistor ON Resistance VIN = 5V 330 500 m
Logic Control / Protection
VEN
Input High Threshold 1.6 V
Input Low Threshold 0.4
VSTAT Output Low Voltage STAT Pin Sinks 4mA 0.4 V
ISTAT STAT Pin Current Sink Capability 8mA
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 5
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 5
www.analogictech.com
Electrical Characteristics
VIN = 5V, TA = -40 to +85°C; Unless otherwise noted, typical values are at TA = 25°C.
Symbol Description Conditions Min Typ Max Units
Logic Control / Protection
VADDP# Output Low Voltage ADPP# Pin Sinks 4mA 0.4 V
IADPP# ADDP# Current Sink Capability 8mA
VOVP Over-Voltage Protection Threshold AAT3663-4.2 4.4 V
AAT3663-8.4 8.8
VOCP Over-Current Protection Threshold 105 %VCS
TK Trickle Charging Time-Out CT = 100nF, VIN = 5V TC/8 Hour
TC Trickle and Constant Current Mode Time-Out CT = 100nF, VIN = 5V 3 Hour
TV Constant Voltage Mode Time-Out CT = 100nF, VIN = 5V 3 Hour
ITS Current Source from TS Pin AAT3663-2 Only 71 75 79 A
TS1 TS Hot Temperature Fault Threshold, AAT3663-2 Only 316 331 346 mV
Hysteresis, AAT3663-2 Only 25
TS2 TS Cold Temperature Fault Threshold, AAT3663-2 Only 2.30 2.39 2.48 V
Hysteresis, AAT3663-2 Only 25 mV
VTS1 High Temperature Threshold Threshold, AAT3663-1 Only 29.1 30 30.9 %VIN
Hysteresis, AAT3663-1 Only 2
VTS2 Low Temperature Threshold Threshold, AAT3663-1 Only 58.2 60 61.8 %VIN
Hysteresis, AAT3663-1 Only 2
TLOOP_IN Digital Thermal Loop Entering Threshold 115 °C
TLOOP_OUT Digital Thermal Loop Exiting Threshold 85 °C
TREG Digital Thermal Loop Regulation 100 °C
TSHDN Over-Temperature Shutdown Threshold 140 °C
Hysteresis 15
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
6 3663.2008.01.1.2
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
6 3663.2008.01.1.2
www.analogictech.com
Typical Characteristics—General
Operating Current vs ISET Resistor
RSET (kΩ
Ω
)
Operating Current (µA)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
1 10 100
Constant Current Mode
Preconditioning Mode
Constant Charging Current
vs. Set Resistor Values
RSET (kΩ
Ω
)
Constant Charge Current (mA)
1
10
100
1000
10000
1 10 100
Temperature Sense Output Current
vs. Temperature
Temperature (°C)
ITS (µA)
70
71
72
73
74
75
76
77
78
79
80
-40 -15 10 35 60 85
Shutdown Current vs. Input Voltage
Input Voltage (V)
Shutdown Current (µA)
0.00
0.30
0.60
0.90
1.20
1.50
1.80
2.10
2.40
4 5 6 7 8 9 10 11 12 13 1
4
85°C
25°C
-40°C
Charging Transistor On Resistance
vs. Input Voltage
Input Voltage (V)
RDS(ON) (mΩ
Ω
)
0
100
200
300
400
500
600
4.0 4.4 4.8 5.2 5.6 6.0 6.4 6.8 7.2 7.6 8.0 8.
4
85°C
25°C -40°C
CT Pin Capacitance vs. Counter Timeout
Timeout (h)
Capacitance (µF)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 0.5 1 1.5 2 2.5 3 4 4.5 53.5
Preconditioning Timeout
Preconditioning + Constant
Current Timeout or Constant
Voltage Timeout
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 7
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 7
www.analogictech.com
Temperature Sense Too Hot Threshold Voltage
vs. Temperature
Temperature (°C)
Temperature Sense Too Hot
Threshold (%)
29.0
29.2
29.4
29.6
29.8
30.0
30.2
30.4
30.6
30.8
31.0
-40 -15 10 35 60 85
Temperature Sense Too Cold Threshold Voltage
vs. Temperature
Temperature (°C)
Temperature Sense Too Cold
Threshold (%)
59.0
59.2
59.4
59.6
59.8
60.0
60.2
60.4
60.6
60.8
61.0
-40 -15 10 35 60 85
Input High Threshold vs. Input Voltage
Input Voltage (V)
VEN(H) (V)
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
4 5 6 7 8 9 10 11 12 13 14
-40°C
25°C 85°C
Input Low Threshold vs. Input Voltage
Input Voltage (V)
VEN(L) (V)
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
4 5 6 7 8 9 10 11 12 13 14
-40°C
25°C 85°C
Termination Current to Constant Current
Ratio (%) vs. Termination Resistance
RTERM (kΩ
Ω
)
ICH_TERM/ICH_CC (%)
0
5
10
15
20
25
30
35
40
45
50
0 102030405060
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
8 3663.2008.01.1.2
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
8 3663.2008.01.1.2
www.analogictech.com
Typical Characteristics—Single Cell 4.2V
End of Charge Voltage Accuracy vs. Input Voltage
(VBAT_EOC = 4.2V)
Input Voltage (V)
End of Charge
Voltage Accuracy (%)
-0.100
-0.075
-0.050
-0.025
0.000
0.025
0.050
0.075
0.100
4 5 6 7 8 9 10 11 12 13 14
End of Charge Voltage vs. Temperature
Temperature (°C)
Battery Voltage (V)
4.180
4.185
4.190
4.195
4.200
4.205
4.210
4.215
4.220
-40 -15 10 35 60 85
Recharge Threshold Voltage vs. Input Voltage
Input Voltage (V)
Battery Voltage (V)
4.080
4.085
4.090
4.095
4.100
4.105
4.110
4.115
4.120
4 5 6 7 8 9 10 11 12 13 14
Recharge Voltage vs. Temperature
(VIN = 5V; RSET = 8.87kΩ
Ω
)
Temperature (ºC)
Battery Voltage (V)
4.06
4.07
4.08
4.09
4.10
4.11
4.12
4.13
4.14
-40 -15 10 35 60 8
5
Charging Current vs. Battery Voltage
(RSET = 8.87KΩ
Ω
)
Battery Voltage (V)
Charging Current (mA)
0
30
60
90
120
150
180
210
240
2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.
3
VIN = 13.2VVIN = 12V
VIN = 5V VIN = 9.5VVIN = 7.5V
Charging Current vs. Battery Voltage
Battery Voltage (V)
ICH (mA)
0
200
400
600
800
1000
1200
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.
3
RSET = 8.87KΩ
RSET = 2.21KΩ
RSET = 3.57KΩ
RSET = 1.78KΩ
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 9
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 9
www.analogictech.com
Typical Characteristics—Single Cell 4.2V
Preconditioning Threshold Voltage vs. Input Voltag
e
Input Voltage (V)
Battery Voltage (V)
2.50
2.52
2.54
2.56
2.58
2.60
2.62
2.64
2.66
2.68
2.70
4 5 6 7 8 9 10 1112 1314
Preconditioning Threshold Voltage vs. Temperature
Temperature (°C)
Battery Voltage (V)
2.50
2.52
2.54
2.56
2.58
2.60
2.62
2.64
2.66
2.68
2.70
-40 -15 10 35 60 85
Preconditioning Charge Current
vs. Input Voltage
Input Voltage (V)
ICH_TRK (mA)
0
20
40
60
80
100
120
4 5 6 7 8 9 10 11 12 13 14
RSET = 1.78kΩ
RSET = 2.21kΩ
RSET = 3.57kΩ
RSET = 8.87kΩ
Constant Charge Current vs. Input Voltage
(RSET = 8.87KΩ
Ω
)
Input Voltage (V)
Charge Current (mA)
160
170
180
190
200
210
220
230
240
4 5 6 7 8 9 10 11 12 13 14
VBAT = 4.1V
VBAT = 3.9V
VBAT = 3.5V
VBAT = 3.3V
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
10 3663.2008.01.1.2
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
10 3663.2008.01.1.2
www.analogictech.com
Typical Characteristics—Dual Cell 8.4V
End of Charge Voltage Accuracy vs. Input Voltage
(VBAT_EOC = 8.4V)
Input Voltage (V)
End of Charge Voltage Accuracy (%)
-0.12
-0.09
-0.06
-0.03
0.00
0.03
0.06
0.09
0.12
9.0 9.6 10.2 10.8 11.4 12.0 12.6 13.2
End of Charge Voltage vs. Temperature
(VIN = 10V; RSET = 8.87kΩ
Ω
)
Temperature (°C)
Battery Voltage (V)
8.36
8.37
8.38
8.39
8.40
8.41
8.42
8.43
8.44
-40 -15 10 35 60 85
End of Charge Voltage vs. Input Voltage
(RSET = 8.87kΩ
Ω
)
Input Voltage (V)
Battery Voltage (V)
8.380
8.385
8.390
8.395
8.400
8.405
8.410
8.415
8.420
9.0 9.6 10.2 10.8 11.4 12.0 12.6 13.2
Recharge Threshold Voltage vs. Input Voltage
Input Voltage (V)
Battery Voltage (V)
8.180
8.185
8.190
8.195
8.200
8.205
8.210
8.215
8.220
8 9 10 11 12 13 14
Recharge Threshold Voltage vs. Temperature
(VIN = 10V; RSET = 8.87KΩ
Ω
)
Temperature (°C)
Battery Voltage (V)
8.12
8.14
8.16
8.18
8.20
8.22
8.24
8.26
8.28
-40 -15 10 35 60 85
Constant Charging Current vs. Battery Voltage
(RSET = 8.87KΩ
Ω
)
Battery Voltage (V)
Charging Current (mA)
0
30
60
90
120
150
180
210
240
4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 8.1 8.5
VIN = 10V
VIN = 11V
VIN = 12V
VIN = 13.2V
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 11
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 11
www.analogictech.com
Typical Characteristics—Dual Cell 8.4V
Constant Charging Current vs. Battery Voltage
Battery Voltage (V)
ICH (mA)
0
200
400
600
800
1000
1200
4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 8.1 8.
5
RSET = 1.78KΩ
RSET = 2.21KΩ
RSET = 3.57KΩ
RSET = 8.87KΩ
Preconditioning Threshold Voltage vs. Input Voltag
e
Input Voltage (V)
Battery Voltage (V)
5.180
5.185
5.190
5.195
5.200
5.205
5.210
5.215
5.220
8 9 10 11 12 13 14
Preconditioning Threshold Voltage vs. Temperature
Temperature (°C)
Battery Voltage (V)
5.16
5.17
5.18
5.19
5.20
5.21
5.22
5.23
5.24
-40 -15 10 35 60 85
Constant Charge Current vs. Input Voltage
(RSET = 8.87KΩ
Ω
)
Input Voltage (V)
Charge Current (mA)
160
170
180
190
200
210
220
230
240
8 9 10 11 12 13 14
VBAT = 8.2V
VBAT = 6.6V
VBAT = 7V
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
12 3663.2008.01.1.2
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Functional Description
The AAT3663 is a high performance battery charger
designed to charge single/dual cell Lithium-Ion or
Lithium-Polymer batteries with up to 1000mA of current
from an external power source. It is a highly integrated
stand-alone charging solution, with the least external
components required for complete functionality.
The AAT3663 precisely regulates end of charge battery
voltage and current for single cell 4.2V and dual cell 8.4V
lithium-ion/polymer battery with a programmable con-
stant current range from 100mA to 1A for fast charging
applications. The system has a default charge termina-
tion current set to 10 percent of the programmed fast
charge constant. The charge termination current may
also be user programmed by an external resistor.
During battery charging, the device temperature will rise.
In some cases with adapter (ADP) charging, the power
dissipation in the charge regulation pass device may
cause the junction temperature to rise and approach the
internal thermal shutdown threshold. Excessive power
dissipation is caused by the high input adapter voltage
versus the low output battery cell voltage difference at a
given constant charge current. In the event of an internal
over-temperature condition caused by excessive ambient
operating temperature or excessive power dissipation
conditions, the AAT3663 enables a digitally controlled
thermal loop system that will reduce the charging current
to prevent thermal shutdown. The digital thermal loop
will maintain the maximum possible battery charging
current for a given set of input to output power dissipa-
tion and ambient temperature conditions.
The digital thermal loop control is dynamic in the sense
that it will continue to adjust the battery charging current
as operating conditions change. The digital thermal loop
will reset and resume normal operation when the power
dissipation or over-temperature conditions are removed.
In the event of an over-voltage, over-current or over-
temperature false condition beyond the limits of the
digital thermal loop system, the device will automati-
cally shut down, thus protecting the charging device,
control system, and the battery under charge.
AAT3663 provides two status monitor pins, STAT1 and
STAT2. These pins are open drain MOSFET switches
intended to directly drive external LEDs to indicate the
battery charging state. A third status pin is prided to
indicate the presence of power on the input supply pin.
Functional Block Diagram
Charge
Control
Current
Compare
Reverse Blocking
CV/
Precharge
Constant
Current
IN BAT
ISET UVLO
Over-Temp
Protect
Power
Detection STAT 1
GND
EN
Thermal
Loop
A
DPP#
Charge
Status
BATS
CT
TS
STAT 2
Watchdog
Timer
TERM
75μA
AAT3663-2 Only
Window Comparator
AAT3663
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This open drain MOSFET switch may be used to either
power a display LED or to alert a system microcontroller
for the presence on input power.
Battery Charging Operation
Figure 1 illustrates the entire battery charging profile
and operation, which consists of three phases:
1. Preconditioning (Trickle) Charge
2. Constant Current Charge
3. Constant Voltage Charge
When power is initially applied or when a battery pack is
connected to the BAT pin, battery charging commences
after the AAT3663 checks several conditions in order to
maintain a safe charging environment. The input supply
must be above the minimum operating voltage (UVLO)
and the enable pin must be high (internally pulled
down). When the battery is connected to the BAT pin the
AAT3663 checks the condition of the battery and deter-
mines which charging mode to apply.
Battery Preconditioning
If the battery voltage is below VMIN, the AAT3663 begins
battery trickle charging by charging at 10% of the pro-
grammed constant-current. For example, if the pro-
grammed current is 500mA, then the trickle charge
current is 50mA. Trickle charging is a recommended
safety precaution for a deeply discharged cell and maxi-
mizes the charge cycle life of the battery. In addition,
charger IC power dissipation for the internal series pass
MOSFET is minimized when the input-output voltage dif-
ferential is at its highest. This in turn allows the charg-
ing operation to commence over wider thermal and input
to output voltage differential conditions.
Constant Current Charging
Trickle charging continues until the battery voltage
reaches the VMIN threshold. At this point, the AAT3663
begins constant-current fast charging. The current level
for this mode is programmed using a single resistor from
the ISET pin to ground. Programmed current can be set
at a minimum 100mA up to a maximum 1A.
Constant Voltage Charging
Constant current charging continues until such time that
the battery voltage reaches the voltage regulation point
VBAT_REG. When the battery voltage reaches VBAT_REG, the
AAT3663 will transition to the constant-voltage mode.
The regulation voltage is factory programmed to a nom-
inal 4.2V for the AAT3663-4.2 option and to 8.4V for the
AAT3663-8.4 option. Under default conditions with the
TERM pin not connected (open circuit), constant voltage
charging will continue until the charge current has
reduced to 10% of the programmed current. Placing a
resistor between the TERM pin and ground allows the
user to program a desired termination current.
After the charge cycle is complete, the AAT3663 turns
off the series pass device and automatically goes into a
power saving sleep mode. During this time the series
pass device will block current in both directions there-
fore preventing the battery discharging through the IC.
The AAT3663 will remain in sleep mode, until either the
battery terminal voltage drops below the VRCH threshold,
the charger EN pin is recycled or the charging power
source is reconnected. In all cases the AAT3663 will
monitor all battery parameters and resume charging in
the appropriate mode.
Constant Current
Charge Phase
Constant Voltage
Charge Phase
Preconditioning
Trickle Charge
Phase
Charge Complete Voltage
Constant Current Mode
Voltage Threshold
Regulated Current
Trickle Charge and
Termination Threshold
I = CC / 10
I = Max CC
Figure 1: Current and Voltage Profile During Charging Phases.
AAT3663
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System Operation Flow Chart
V
CH>V
BAT
V
MIN
>V
BAT
Shut Down
Mode
Shut Down
Mode
I
BAT
> I
MIN
No
No
Charge
Completed
Charge
Completed
Recharge
RCH V
Yes
Set
Expire
Yes
No Device Temp.
Monitor
TJ>110°C
Yes
ADP
Voltage
S
ADP > V
ADPP
No
Preconditioning
Test
VMIN >VBAT
Current Phase Test
VIN >V
BAT_EOC
Voltage Phase Test
IBAT >ITERM
Shut Down
Mode
Shut Down
Mode
No
No
Charge
Completed
Charge
Completed
Test
VRCH > BAT
Yes
Set
Expire
Yes
No Device Temp.
Monitor
T
J>115°C
Yes
Fault
No
Yes
No
Power Select
Power Input
Voltage
VIN>VUVLO
Power Select
Fault
Condition Monitoring
OV, OT,
VTS1<TS<VTS 2
Sleep
Mode
Sleep
Mode
Sleep
Power On
Reset
Shut Down
Mode
Shut Down
Mode
Shut Down
Mode
Preconditioning
(Trickle Charge)
YesYes
Shut Down
Mode
Shut Down
Mode
Shut Down
Mode
Constant Current
Charge Mode
YesYes
YesYes Shut Down
Mode
Shut Down
Mode
Shut Down
Mode
Constant Voltage
Charge Mode
NoNo
NoNo
NoNo
Shut Down
Mode
Shut Down
Mode
Shut Down
Mode
Charger Timer
Control
Shut Down
Mode
Shut Down
Mode
Shut Down
Mode
Thermal Loop
Current Reduction
In C.C. Mode
Yes
Enable
EN=HIGH
Power Select
No
VBAT<VMIN or
<VBAT_REG or
IBAT>ITERM
Shut Down
Mode
Shut Down
Mode
Shut Down
Mode
FAULT
STAT1=Off
STAT2=Off
Yes
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Application Information
Adapter or USB Power Input
Constant current charge levels up to 1A may be pro-
grammed by the user when powered from a sufficient
input power source. The AAT3663 will operate over an
input voltage range from 4.0V to 13.2V. The low input
voltage capability of the AAT3663 permits charging sin-
gle cell Li-Ion/Poly batteries from USB ports and lower
voltage input power sources. The high 13.2V input rating
of this device allows for the use of a wide range of input
power sources for both single and dual cell Li-Ion/Poly
applications.
Adapter Input Charge
Inhibit and Resume
The AAT3663 has an under-voltage lockout (UVLO) and
power on reset feature so that if the input supply to the
IN pin drops below the UVLO threshold, the charger will
suspend charging and shut down. When power is reap-
plied to the IN pin or the UVLO condition recovers, the
system charge control will assess the state of charge on
the battery cell and will automatically resume charging in
the appropriate mode for the condition of the battery.
Battery Connection and
Battery Voltage Sensing
Battery Connection
A single or dual cell Li-Ion/Polymer battery should be
connected between the BAT pin and ground.
Battery Voltage Sensing
The BATS pin is provided to employ an accurate voltage
sensing capability to measure the positive terminal volt-
age at the battery cell being charged. This function
reduces measured battery cell voltage error between the
battery terminal and the charge control IC. The AAT3663
charge control circuit will base charging mode states
upon the voltage sensed at the BATS pin. The BATS pin
must be connected to the battery terminal for correct
operation. If the battery voltage sense function is not
needed, the BATS pin should be terminated directly to
the BAT pin. If there is concern of the battery sense
function inadvertently becoming an open circuit, the
BATS pin may be terminated to the BAT pin using a 10kΩ
resistor. Under normal operation, the connection to the
battery terminal will be close to 0Ω; if the BATS connec-
tion becomes an open circuit, the 10kΩ resistor will pro-
vide feedback to the BATS pin from the BAT connection
with a voltage sensing accuracy loss of 1mV or less.
Enable (EN)
EN is a logic input (active high) to enable the charger,
this function is internally pulled down to ground. When
the device is initially enabled or if the EN pin is cycled low
and then re-enabled, the charge control circuit will auto-
matically reset and resume charging functions with the
appropriate charging mode based on the battery charge
state and measured battery voltage on the BATS pin.
Programming Charge Current
The constant current mode charge level is user pro-
grammed with a set resistor (RSET) connected between the
ISET pin and ground. The accuracy of the constant charge
current, as well as the preconditioning trickle charge cur-
rent, is dominated by the tolerance of the set resistor
used. For this reason, a 1% tolerance metal film resistor
is recommended for the set resistor function. The con-
stant charge current levels from 100mA to 1A may be set
by selecting the appropriate resistor value from Table 1.
Constant Charging
Current (mA)
Set Resistor
Value (kΩ)
100 17.8
200 8.87
300 5.9
400 4.42
500 3.57
600 2.94
700 2.55
800 2.21
900 1.96
1000 1.78
Table 1: RSET Values.
If the desired charge current level is not listed in Table
1, the RSET resistor value can be found in Figure 2 and
calculated by the following equation:
RSET = K · ⎛⎞
⎝⎠
VISET
ICC
Where:
K = KI_SET = 900
VISET = 2V
ICC = Fast charge constant current
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RSET (kΩ
Ω
)
CC Mode Charge Current (mA)
1
10
100
1000
10000
1 10 100
Figure 2: Constant Charging Current vs. RSET
Resistor Values.
Programmable Charge
Termination Current
The AAT3663 is designed with a default charge termina-
tion current set to 10 percent of the programmed fast
charge constant current level. The charge termination
current (ICH_TERM) may also be user programmed to a
level other than 10% of the set fast charge current by
connecting a set resistor (RTERM) between the TERM pin
and ground.
When the charge current under the constant voltage
charging mode drops to the charge termination thresh-
old the device halts charging and goes into a sleep
mode. The charger will remain in the sleep mode until
the battery voltage as sensed by the BATS pin decreases
to a level below the battery recharge voltage threshold
(VRCH). Charge termination current levels based on a
percentage of the programmed fast charge current are
shown in Figure 3.
If the desired charge termination current set resistor
(RTERM) value is not shown in Figure 3, the value may be
determined by the following equation:
ICH_TERM = · ICH_CC
15µA · RTERM
2V
Where:
ICH_TERM = Charge termination current level
ICH_CC = Programmed fast charge constant current level
RTERM = TERM resistor value
RTERM (kΩ
Ω
)
ICH_TERM/ICH_CC (%)
0
5
10
15
20
25
30
35
40
45
50
0 102030405060
Figure 3: Charge Termination Current (% Value of
the Programmed Fast Charge Current) vs. RTERM
Resistance.
Battery Charge Status Indication
The AAT3663 indicates the status of the battery under
charge using three status LED driver outputs. These
three LEDs can indicate simple functions such as input
power present, no battery charge activity, battery charg-
ing, charge complete and charge fault.
Status Indicator Display
System charging status may be displayed using one or
two LEDs in conjunction with the STAT1 and STAT2 pins
on the AAT3663. These two pins are simple open drain
N-channel MOSFET switches to connect the status LED
cathodes to ground. It is not necessary to use both dis-
play LEDs if a user simply wants to have a single LED to
show “charging” or “not charging”. This can be accom-
plished by just using the STAT1 pin and a single LED.
Using two LEDs and both STAT pins simply gives the user
more information for the various charging states. Refer
to Table 2 for LED display definitions.
Event Description STAT1 STAT2
Charge enabled without battery Flash1Flash1
Battery charging ON OFF
Charging completed OFF ON
Fault OFF OFF
Table 2: LED Status Indicator Truth Table.
1. Flashing rate depends on output capacitance.
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The LED anodes should be connected to the charger
power source input (IN pin).
Input Power Present Indicator
The ADDP# pin provides an additional open drain
N-channel MOSFET switch to indicate the presence of
power applied to the charger input (IN pin). This func-
tion may either be used to control an addition status LED
to give a visual indication when input power is applied.
This open drain output may also be pulled high via a pull
up resistor to provide an active low signal to a system
microcontroller to indicate the presence of applied input
power.
Status Display LED Biasing
The LED should be biased with as little current as neces-
sary to create reasonable illumination; therefore, a bal-
last resistor should be placed between the LED cathode
and the STAT pin. LED current consumption will add to
the overall thermal power budget for the device pack-
age, hence it is good to keep the LED drive current to a
minimum. 2mA should be sufficient to drive most low-
cost green or red LEDs. It is not recommended to exceed
8mA for driving an individual status LED.
The required ballast resistor values can be estimated
using the following formula:
(V
IN -
V
F(LED)
)
R
BALLAST
= I
LED
Example:
(5.0V
- 2.0
V)
R
BALLAST
= = 1.5kΩ
2mA
Note: Red LED forward voltage (VF) is typically 2.0V @
2mA.
Digital Thermal Loop Control
Due to the integrated nature of the linear charging con-
trol pass device for the adapter mode, a special thermal
loop control system has been employed to maximize
charging current under all operation conditions. The
thermal management system measures the internal cir-
cuit die temperature and reduces the fast charge current
when the device exceeds a preset internal temperature
control threshold. Once the thermal loop control becomes
active, the fast charge current is initially reduced by a
factor of 0.28. The initial thermal loop current can be
estimated by the following equation:
ITLOOP = ICH_CC · 0.28
The thermal loop control re-evaluates the circuit die tem-
perature every 1.5 seconds and adjusts the fast charge
current back up in small steps to the full fast charge cur-
rent level or until an equilibrium current is discovered
and maximized for the given ambient temperature condi-
tion. The thermal loop controls the system charge level;
therefore, the AAT3663 will always provide the highest
level of constant current in the fast charge mode possible
for any given ambient temperature condition.
Protection Circuitry
Programmable Timer Function
The AAT3663 contains a watchdog timing circuit to shut
down charging functions in the event of a defective bat-
tery cell not accepting a charge over a preset period of
time. Typically, a 0.1F ceramic capacitor is connected
between the CT pin and ground. When a 0.1F ceramic
capacitor is used, the device will time out a shutdown
condition if the trickle charge mode exceeds 25 minutes
and a combined trickle charge plus constant current
mode of 3 hours. When the device transitions to the
constant voltage mode, the timing counter is reset and
will time out after an additional 3 hours if the charge
current does not drop to the charge termination level.
The AAT3663 has a battery fault detector, which, when
used in conjunction with a 0.1F capacitor on the CT pin,
outputs a 1Hz signal with 50% duty cycle at the STAT1
pin in the event of a timeout while in the trickle charge
mode.
Mode Time
Trickle Charge (TC) Time Out 25 minutes
Trickle Charge (TC) + Constant Current (CC)
Mode Time Out 3 hours
Constant Voltage (CV) Mode Time Out 3 hours
Table 3: Summary for a 0.1μF Ceramic Capacitor
Used for the Timing Capacitor.
The CT pin is driven by a constant current source and
will provide a linear response to increases in the timing
capacitor value. Thus, if the timing capacitor were to be
doubled from the nominal 0.1F value, the timeout peri-
ods would be doubled. If the programmable watchdog
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timer function is not needed, it can be disabled by ter-
minating the CT pin to ground. The CT pin should not be
left floating or unterminated, as this will cause errors in
the internal timing control circuit. The constant current
provided to charge the timing capacitor is very small,
and this pin is susceptible to noise and changes in capac-
itance value. Therefore, the timing capacitor should be
physically located on the printed circuit board layout as
close as possible to the CT pin. Since the accuracy of the
internal timer is dominated by the capacitance value, a
10% tolerance or better ceramic capacitor is recom-
mended. Ceramic capacitor materials, such as X7R and
X5R types, are a good choice for this application.
Over-Voltage Protection
An over-voltage event is defined as a condition where
the voltage on the BAT pin exceeds the maximum bat-
tery charge voltage and is set by the overvoltage protec-
tion threshold (VOVP). If an over-voltage condition occurs,
the AAT3663 charge control will shut down the device
until the voltage on the BAT pin drops below VOVP
. The
AAT3663 will resume normal charging operation after
the overvoltage condition is removed. During an over-
voltage event, the STAT LEDs will report a system fault.
Over-Temperature Shutdown
The AAT3663 has a thermal protection control circuit
which will shut down charging functions once the internal
die temperature exceeds the over-temperature shut-
down threshold. Once the internal die temperature falls
below the hysteresis, normal operation will resume the
previous charging state.
Battery Temperature Fault Monitoring
There are two AAT3663 temperature sense options, The
AAT3663-1 and AAT3663-2. The AAT3663-1 option
allows of the use of any NTC resistor. For ease of use, the
AAT3663-2 option is factory set to function with typical
10kΩ NTC resistors and eliminates the need for a resistor
divider pull up to the input power source.
Regardless of the AAT3663 option selected, the internal
system control checks battery temperature before start-
ing the charge cycle and continues to monitor the bat-
tery temperature during all stages of the charging cycle.
This is accomplished by monitoring the voltage at the TS
pin. In general, the system is intended for use with
negative temperature coefficient thermistors (NTC)
which are typically integrated into the battery package.
The voltage on the TS pin resulting from the resistive
load and applied current, should stay within a window
bounded by the TS1 and TS2 specification thresholds.
Refer to the Electrical Characteristics table for the TS1
and TS2 limits for a selected AAT3663 option. If the bat-
tery becomes too hot during charge cycle due to an
internal fault or excessive charge current, the NTC
thermistor will heat up and reduce in value. This in turn
will pull the TS pin voltage below than the TS1 threshold,
and indicate a battery cell temperature fault. The charg-
ing process will then be suspended until the over-tem-
perature condition is removed, at which time charging
will resume. Conversely, if the battery under charge is
exposed to extreme cold ambient temperature condition,
the NTC thermistor may increase in value and push the
voltage on the TS pin above the TS2 threshold. In such
a case, the charge cycle will be suspended and will not
resume until the cold fault condition is removed. Both
TS1 and TS2 temperature fault conditions will be report
by the STAT1 and STAT2 LEDs.
AAT3663-1 Option
the AAT3663-1 option utilizes an internal battery tem-
perature sensing system comprised of two comparators
which establish a voltage window for safe operation. The
thresholds for the TS operating window are bounded by
the TS1 and TS2 specifications. Referring to the electri-
cal characteristics table in this datasheet, the TS1
threshold = 0.30 · VIN and the TS2 threshold = 0.6 · VIN.
Refer to Figure 4 for external resistor and NTC thermis-
tor connections.
If the use of the battery temperature sense function is
not required, it may be disabled by terminating the TS
pin to IN and ground using a 10kΩ resistor divider net-
work. If circuit power dissipation is a concern, the two
terminating resistor values may be increased to 100kΩ.
AAT3663-2 Option
Most of the commonly used NTC thermistors in Li-Ion/
Polymer battery packs are approximately 10k at room
temperature (25°C). The AAT3663-2 TS pin has been
specifically designed to source 75A of current to the
10kΩ NTC thermistor. The applied constant current
source and fixed internal TS1 and TS2 voltage thresholds
eliminate the need for a resistor divider on the TS pin.
Simply connect the 10kΩ NTC resistor between the TS
pin and ground. If the TS function is not needed for the
AAT3663-2, it may be left open (not connected).
AAT3663
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T
IN
TS
Battery
Pack
AAT3663-4.2-1 or AAT3663-8.4-1
Battery Cold Fault
Battery Hot Fault
0.6xVIN
0. 30 x VIN
RT
RNTC
VIN
Figure 4: External Resistor and NTC Thermistor Application Circuit.
Thermal Considerations
The AAT3663 is offered in a 3x3mm TDFN package which
can provide up to 2.0W of power dissipation when it is
properly bonded to a printed circuit board and has a
maximum thermal resistance of 50°C/W. Many consider-
ations should be taken into account when designing the
printed circuit board layout, as well as the placement of
the charger IC package in proximity to other heat gener-
ating devices in a given application. The ambient tem-
perature around the charger IC will also have an effect on
the thermal limits of the battery charging operation. The
maximum limits that can be expected for a given ambient
condition can be estimated by the following discussion.
First, the maximum power dissipation for a given situa-
tion should be calculated:
(T
J -
T
A
)
P
D(MAX)
= θ
JA
Where:
PD(MAX) = Maximum Power Dissipation (W)
JA = Package Thermal Resistance (°C/W)
TJ = Thermal Loop Entering Threshold (ºC) [115ºC]
TA = Ambient Temperature (°C)
Figure 5 shows the relationship between maximum
power dissipation and ambient temperature of AAT3663
TA (°C)
PD(MAX) (W)
0.00
0.50
1.00
1.50
2.00
2.50
0 25 50 75 100
Figure 5: Maximum Power Dissipation Before
Entering Thermal Loop.
Next, the power dissipation can be calculated by the fol-
lowing equation:
(P
D(MAX) -
V
IN
·
I
OP
)
V
IN
- V
BAT
I
CH(MAX)
=
(T
J -
T
A
)
θ
JA
V
IN
- V
BAT
I
CH(MAX)
=
-
V
IN
·
I
OP
Where:
PD = Total Power Dissipation by the Device
VIN = Input Voltage
VBAT = Battery Voltage as Seen at the BAT Pin
ICH = Constant Charge Current Programmed for the
Application
IOP = Quiescent Current Consumed by the Charger IC
for Normal Operation [0.5mA]
AAT3663
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By substitution, we can derive the maximum charge cur-
rent before reaching the thermal limit condition which
will activate digital thermal loop operation. The maxi-
mum charge current is the key factor when designing
battery charger applications.
In general, the worst case condition is when the greatest
input to output voltage drop occurs across the charger
IC. Specifically when battery voltage is charged up just
above the preconditioning voltage threshold and the
charger enters into the constant current fast charging
mode. Under this condition, the device will suffer the
maximum possible power dissipation since both the volt-
age difference across the device and the charge current
will be at their respective maximums. Figure 6 shows
the safe fast charge current operating region for differ-
ent ambient temperatures. Exceeding these limits will
drive the charge control into digital thermal loop opera-
tion. When under digital thermal loop operation, the
device will remain active and continue to charge the bat-
tery at a reduced current level for the given ambient
condition.
VIN (V)
ICC(MAX) (mA)
0
200
400
600
800
1000
4 5 6 7 8 9 10 11 12 13
TA = 85°C TA = 60°C
TA = 25°C
TA = 45°C
Figure 6: Maximum Charging Current Before the
Digital Thermal Loop Becomes Active.
Capacitor Selection
Input Capacitor
In general, it is a good design practice to place a decou-
pling capacitor between the IN pin and ground. An input
capacitor in the range of 1F to 22F is recommended.
If the source supply is unregulated, it may be necessary
to increase the capacitance to keep the input voltage
above the under-voltage lockout threshold during device
enable and when battery charging is initiated. If the
AAT3663’s input is to be used in a system with an exter-
nal power supply source, such as a typical AC-to-DC wall
adapter, then a CIN capacitor in the range of 10F should
be used. A larger input capacitor in this application will
minimize switching or power transient effects when the
power supply is “hot plugged” in.
Output Capacitor
The AAT3663 only requires a 1F ceramic capacitor on
the BAT pin to maintain circuit stability. This value should
be increased to 10F or more if the battery connection is
made any distance from the charger output. If the
AAT3663 is to be used in applications where the battery
can be removed from the charger, such as desktop
charging cradles, an output capacitor 10F or greater is
recommended to reduce the effect of the charger cycling
on and off when no battery is present.
Printed Circuit Board
Layout Considerations
For the best results, it is recommended to physically place
the battery pack as close as possible to the AAT3663 BAT
pin. To minimize voltage drops on the PCB, keep the high
current carrying traces adequately wide. For maximum
power dissipation of the AAT3663 3x3mm 14-pin TDFN
package, the metal substrate should be solder bonded to
the board. It is also recommended to maximize the sub-
strate contact to the PCB ground plane layer to further
increase local heat dissipation. Refer to the AAT3663
evaluation board for a good layout example.
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Figure 7: AAT3663 Evaluation Board Figure 8: AAT3663 Evaluation Board
Top (Component) Side Layout. Bottom Side Layout.
C2 0805 X7R 10μF 10V GRM21BR71A106KE51L
C1 1206 X7R 10μF 16V GRM31CR71C106KAC7L
2kR4
D1
C1
10μF
C2
10μF
C3
0.1μF
ENABLE
JP1
R2
10k
R1
1.74k
2kR5
D2
2kR6
D3
R3
10k
4V - 13.2V
R7
(see note)
JP3
JP2
JP4
VIN
GND GND
BAT
TS
VIN
EN
1
IN
9
GND
4
TS 5
STAT2
10
IN
8
STAT1
11
BATS 6
BAT 7
ISET 3
TERM 13
ADPP#
12
CT 2
EP
U1
TDFN33-14 AAT3663
Note: R2 = 10k is set the termination current, 7.5% from the constant charging current
R7 = 10k (for -1 option) R7 = open (for -2 option)
Green
LED
Red
LED
Red
LED
Figure 9: AAT3663 Evaluation Board Schematic Diagram.
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AAT3663
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Ordering Information
Battery Cell
Voltage Option Battery Temperature Sense Package Marking1Part Number (Tape and Reel)2
Single Cell (4.2V) For Use With Any NTC Thermistor TDFN33-14 1XXYY AAT3663IWO-4.2-1-T1
Single Cell (4.2V) For Use With 10k NTC Thermistor TDFN33-14 ZZXYY AAT3663IWO-4.2-2-T1
Dual Cell (8.4V) For Use With Any NTC Thermistor TDFN33-14 1YXYY AAT3663IWO-8.4-1-T1
Dual Cell (8.4V) For Use With 10k NTC Thermistor TDFN33-14 1ZXYY AAT3663IWO-8.4-2-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor
products that are in compliance with current RoHS standards, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. For more information, please visit our website at
http://www.analogictech.com/about/quality.aspx.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 23
www.analogictech.com
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell ApplicationsBatteryManager
TM
PRODUCT DATASHEET
3663.2008.01.1.2 23
www.analogictech.com
Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual
property rights are implied. AnalogicTech reserves the right to make changes to their products or specifi cations or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and
conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fi tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to
support this warranty. Specifi c testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other
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Package Information
TDFN33-14
Top View Bottom View
3.000
±
0.050
Index Area
3.000
±
0.050
Detail "A"
1.650
±
0.050
2.500
±
0.050
0.203 REF
0.750
±
0.050
0.000
+
0.100
- 0.000
Detail "A"
Side View
0.425
±
0.050
0.400 BSC
0.180
±
0.050
Pin 1 Indicator
(Optional)
All dimensions in millimeters.
1. 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.
