AAT3663IWO-4.2-1-T1 [SKYWORKS]
Power Supply Management Circuit, Adjustable, 1 Channel, PDSO14, TDFN-14;
| 型号： | AAT3663IWO-4.2-1-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Power Supply Management Circuit, Adjustable, 1 Channel, PDSO14, TDFN-14 光电二极管 |
| 文件： | 总23页 (文件大小：866K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
General Description
Features
The AAT3663 BatteryManager™ is a member of Skyworks'
Total Power Management IC™ family. This device is an
integrated single/dual cell Lithium-Ion (Li-Ion) / polymer
battery charger IC designed to operate from USB ports
or an AC adapter inputs up to an input voltage of 13.2V.
•ꢀ 4.0Vꢀ~ꢀ13.2VꢀInputꢀVoltageꢀRange
•ꢀ CompatibleꢀwithꢀUSBꢀorꢀACꢀAdapterꢀSources
•ꢀ Programmable Fast Charge Current from 100mA to 1A
•ꢀ ProgrammableꢀChargeꢀTerminationꢀCurrentꢀ
•ꢀ DigitalꢀThermalꢀLoopꢀChargeꢀReduction
•ꢀ LessꢀThanꢀ0.4µAꢀBatteryꢀLeakageꢀCurrent
•ꢀ ProgrammingꢀChargeꢀTimer
•ꢀ BatteryꢀTemperatureꢀSensing
•ꢀ BatteryꢀTempꢀSenseꢀOpenꢀCircuitꢀDetection
•ꢀ AutomaticꢀRechargeꢀSequencing
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.
•ꢀ AutomaticꢀTrickleꢀChargeꢀforꢀBatteryꢀPre-Conditioning
•ꢀ AutomaticꢀChargeꢀTerminationꢀShutdown/SleepꢀMode
•ꢀ Lessꢀthanꢀ1µAꢀShutdownꢀCurrent
•ꢀ Over-VoltageꢀandꢀOver-CurrentꢀProtection
•ꢀ PowerꢀOnꢀResetꢀandꢀSoftꢀStart
•ꢀ 3ꢀ×ꢀ3mmꢀ14-pinꢀTDFNꢀPackage
Applications
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
•ꢀ DigitalꢀStillꢀCameras
•ꢀ GlobalꢀPositioningꢀSystemsꢀ(GPS)
•ꢀ PointꢀOfꢀServiceꢀ(POS)ꢀTerminals
•ꢀ PortableꢀDVDꢀPlayers
•ꢀ PortableꢀMediaꢀPlayersꢀ(PMP)
•ꢀ TwoꢀWayꢀRadios
The AAT3663 is available in a thermally enhanced,
space-saving, 14-pin 3 × 3 mm TDFN package and is
specified for operation over the -40°C to +85°C tem-
perature range.
Typical Application
ON/OFF
EN BATS
BAT
BATT+
IN
VIN
10µF
BATT-
TEMP
AAT3663
TS
STAT1
STAT2
ADPP#
TERM
ISET
Battery
Pack
CT
GND
RSET
RTERM
CT
Skyworks Solutions, Inc.
•
Phone [781] 376-3000
•
Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Pin Description
Pin # Symbol Type Function
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.
Chargeꢀtimerꢀprogrammingꢀpin.ꢀAꢀ0.1µFꢀceramicꢀcapacitorꢀshouldꢀbeꢀconnectedꢀbetweenꢀthisꢀpinꢀ
andꢀGND.ꢀConnectꢀdirectlyꢀtoꢀGNDꢀtoꢀdisableꢀtheꢀtimerꢀfunction.
Chargeꢀcurrentꢀprogrammingꢀpin.ꢀConnectꢀaꢀresistorꢀbetweenꢀthisꢀpinꢀandꢀGNDꢀtoꢀprogramꢀtheꢀcon-
stant fast charge current.
1
2
3
EN
CT
I
I
I
ISET
4
5
GND
TS
I/O
I/O
IC ground connection. Connect this pin to power ground.
Battery temperature sense input. Connect the Li-Ion battery pack NTC resistor terminal to this pin.
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.
6
BATS
I
7
8, 9
BAT
IN
O
I
Battery charge output pin. Connect to the positive battery terminal.
Power supply input pin. Connect the input USB port or Adapter power source to this pin
Charge status pin, open-drain output. Connect the STAT2 LED with a series ballast resistor between
IN and this pin.
Charge status pin, open-drain output. Connect the STAT1 LED with a series ballast resistor between
IN and this pin.
Input supply power-good status pin, open-drain output. Connect the ADPP# status LED with a series
ballast resistor between IN and this pin.
10
11
12
STAT2
STAT1
ADPP#
O
O
O
Chargeꢀterminationꢀcurrentꢀprogrammingꢀinputꢀpin.ꢀConnectꢀaꢀresistorꢀbetweenꢀthisꢀpinꢀandꢀGNDꢀ
toꢀprogramꢀtheꢀchargeꢀterminationꢀcurrent.ꢀWhenꢀTERMꢀisꢀopen,ꢀtheꢀterminationꢀcurrentꢀisꢀ10%ꢀ
(default sertting) of the set maximum charge current.
13
14
TERM
I
N/C
No connection.
Pin Configuration
TDFN33-14
(Top View)
1
2
14
13
EN
CT
N/C
TERM
3
4
5
6
7
12
11
10
9
ISET
GND
TS
BATS
BAT
ADPP#
STAT1
STAT2
IN
8
IN
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VIN
VN
VN
TJ
TLEAD
IN Continuous Voltage
STAT1, STAT2, ADPP#, EN, BAT, BATS
TS,ꢀCT,ꢀTERM,ꢀISET
OperatingꢀJunctionꢀTemperatureꢀRange
Maximum Soldering Temperature (at Leads)
-0.3 to 14
-0.3 to VIN + 0.3
-0.3 to 5.5
-40 to 150
300
V
°C
Thermal Information2
Symbol
Description
Value
Units
qJA
PD
MaximumꢀThermalꢀResistanceꢀ(TDFN3x3)
Maximum Power Dissipation
50
2
°C/W
W
AAT3663 Feature Options
Product
Number of Battery Cells
Battery Temperature Sense
AAT3663-4.2-1
AAT3663-4.2-2
AAT3663-8.4-1
AAT3663-8.4-2
Single
Single
Dual
ForꢀUseꢀWithꢀAnyꢀNTCꢀThermistorꢀ
ForꢀUseꢀWithꢀ10kΩꢀNTCꢀThermistorꢀ
ForꢀUseꢀWithꢀAnyꢀNTCꢀThermistor
ForꢀUseꢀWithꢀ10kΩꢀNTCꢀThermistorꢀ
Dual
1.ꢀStressesꢀaboveꢀthoseꢀlistedꢀinꢀAbsoluteꢀMaximumꢀRatingsꢀmayꢀcauseꢀpermanentꢀdamageꢀtoꢀtheꢀdevice.ꢀꢀFunctionalꢀoperationꢀatꢀconditionsꢀotherꢀthanꢀtheꢀoperatingꢀconditionsꢀ
specifiedꢀisꢀnotꢀimplied.ꢀꢀOnlyꢀoneꢀAbsoluteꢀMaximumꢀratingꢀshouldꢀbeꢀappliedꢀatꢀanyꢀoneꢀtime.
2.ꢀMountedꢀonꢀaꢀFR4ꢀboard.
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Electrical Characteristics
VIN = 5V, TA = -40 to +85°C; Unless otherwise noted, typical values are at TA = 25°C.
Symbol Description
Operation
Conditions
Min
Typ
Max
Units
VIN
InputꢀVoltageꢀRange
Under Voltage Lockout Threshold
UVLOꢀHysteresis
Adapter Present Indicator Threshold
Voltage, VIN – VBAT
4.0
3
13.2
4
V
V
mV
RisingꢀEdge
VUVLO
150
50
VADPP_TH
IOP
VIN > VUVLO
100
mV
OperatingꢀCurrent
Charge Current = 100mA
VBATꢀ=ꢀ4.25V,ꢀENꢀ=ꢀGND
VBATꢀ=ꢀ4V,ꢀINꢀ=ꢀOpen
VEN = 5V
0.35
0.4
0.4
0.6
1
1
2
mA
µA
µA
µA
ISHUTDOWN Shutdown Current
ILEAKAGE
ENLEAKAGE EN Pin Leakage
Voltage Regulation
Leakage Current from BAT Pin
AAT3663-4.2
AAT3663-8.4
4.158
8.316
4.2
8.4
4.242
8.484
VBAT_EOC
EndꢀofꢀChargeꢀVoltageꢀRegulation
V
%
V
DVBAT_EOC
VBAT_EOC
/
End of Charge Voltage Accuracy
Preconditioning Voltage Threshold
BatteryꢀRechargeꢀVoltageꢀThreshold
0.5
AAT3663-4.2
AAT3663-8.4
AAT3663-4.2
AAT3663-8.4
2.5
5.0
2.6
5.2
VBAT_EOC - 0.1
VBAT_EOC - 0.2
2.7
5.4
VMIN
VRCH
V
Current Regulation
ICC_RANGE ChargeꢀCurrentꢀProgrammableꢀRange
100
900
80
1000
1100
120
mA
mA
V
RISETꢀ=ꢀ1.74KΩꢀ(forꢀ1A), VBAT = 3.6V
RISETꢀ=ꢀ17.8KΩꢀ(forꢀ0.1A),ꢀVBAT = 3.6V
1000
100
2
900
0.6
10
Constant-Current Mode Charge
Current
ICH_CC
VISET
KISET
VTERM
ICH_TRK
ISET Pin Voltage
Charge Current Set Factor: ICH_CC/ISET
TERMꢀPinꢀVoltage
Constant Current Mode, VBAT = 3.6V
RTERM = 40kW
V
Trickle-Charge Current
5
5
8
15
15
12
%ꢀICH_CC
%ꢀICH_CC
%ꢀICH_CC
TERMꢀpinꢀopenꢀ
RTERM = 13.3 kW, ICH_CCꢀ≥ꢀ800mA
10
10
ICH_TERM
Charge Termination Current Threshold
Charging Devices
RDS(ON)
ChargingꢀTransistorꢀONꢀResistance
VIN = 5V
330
500
mΩ
Logic Control / Protection
InputꢀHighꢀThreshold
Input Low Threshold
OutputꢀLowꢀVoltage
STAT Pin Current Sink Capability
1.6
VEN
V
0.4
0.4
8
VSTAT
ISTAT
STAT Pin Sinks 4mA
V
mA
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
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# OutputꢀLowꢀVoltage
IADPP#
ADPP# Pin Sinks 4mA
0.4
8
V
mA
ADDP# Current Sink Capability
AAT3663-4.2
AAT3663-8.4
4.4
8.8
105
TC/8
3
VOVP
Over-VoltageꢀProtectionꢀThreshold
V
VOCP
TK
TC
TV
ITS
Over-CurrentꢀProtectionꢀThreshold
TrickleꢀChargingꢀTime-Out
TrickleꢀandꢀConstantꢀCurrentꢀModeꢀTime-Out
ConstantꢀVoltageꢀModeꢀTime-Out
Current Source from TS Pin
%VCS
Hour
Hour
Hour
µA
CT = 100nF, VIN = 5V
CT = 100nF, VIN = 5V
CT = 100nF, VIN = 5V
AAT3663-2ꢀOnly
3
75
71
79
Threshold,ꢀAAT3663-2ꢀOnly
Hysteresis,ꢀAAT3663-2ꢀOnly
Threshold,ꢀAAT3663-2ꢀOnly
Hysteresis,ꢀAAT3663-2ꢀOnly
Threshold,ꢀAAT3663-1ꢀOnly
Hysteresis,ꢀAAT3663-1ꢀOnly
Threshold,ꢀAAT3663-1ꢀOnly
Hysteresis,ꢀAAT3663-1ꢀOnly
316
331
25
2.39
25
30
2
346
TS1
TS2
TSꢀHotꢀTemperatureꢀFaultꢀ
TS Cold Temperature Fault
HighꢀTemperatureꢀThreshold
Low Temperature Threshold
mV
2.30
29.1
58.2
2.48
30.9
61.8
V
mV
VTS1
VTS2
%VIN
%VIN
60
2
TLOOP_IN
TLOOP_OUT
TREG
Digital Thermal Loop Entering Threshold
Digital Thermal Loop Exiting Threshold
DigitalꢀThermalꢀLoopꢀRegulation
115
85
100
140
15
°C
°C
°C
Threshold
Hysteresis
TSHDN
Over-TemperatureꢀShutdown
°C
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Typical Characteristics—General
Operating Current vs ISET Resistor
Constant Charging Current
vs. Set Resistor Values
2000
1800
1600
1400
1200
1000
800
10000
1000
100
10
Constant Current Mode
600
400
200
Preconditioning Mode
10
1
0
1
100
1
10
100
14
5
RSET (kΩ)
RSET (kΩ)
Temperature Sense Output Current
vs. Temperature
Shutdown Current vs. Input Voltage
2.40
2.10
1.80
1.50
1.20
0.90
0.60
0.30
0.00
80
79
78
77
76
75
74
73
72
71
70
85°C
25°C
-40°C
-40
-15
10
35
60
85
4
5
6
7
8
9
10
11
12
13
Temperature (°C)
Input Voltage (V)
Charging Transistor On Resistance
vs. Input Voltage
CT Pin Capacitance vs. Counter Timeout
600
500
400
300
200
100
0
1.0
0.9
0.8
85°C
0.7
Preconditioning Timeout
0.6
0.5
0.4
Preconditioning + Constant
Current Timeout or Constant
0.3
Voltage Timeout
0.2
-40°C
25°C
0.1
0.0
4.0 4.4 4.8 5.2 5.6 6.0 6.4 6.8 7.2 7.6 8.0 8.4
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Input Voltage (V)
Timeout (h)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Temperature Sense Too Hot Threshold Voltage
vs. Temperature
Temperature Sense Too Cold Threshold Voltage
vs. Temperature
31.0
30.8
30.6
30.4
30.2
30.0
29.8
29.6
29.4
29.2
29.0
61.0
60.8
60.6
60.4
60.2
60.0
59.8
59.6
59.4
59.2
59.0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
Input High Threshold vs. Input Voltage
Input Low Threshold vs. Input Voltage
1.3
1.30
1.2
1.1
1.0
0.9
0.8
0.7
0.6
1.20
1.10
1.00
0.90
0.80
0.70
0.60
-40°C
-40°C
25°C
85°C
85°C
25°C
4
5
6
7
8
9
10
11
12
13
14
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Input Voltage (V)
Termination Current to Constant Current
Ratio (%) vs. Termination Resistance
50
45
40
35
30
25
20
15
10
5
0
0
10
20
30
40
50
60
RTERM (kΩ)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Typical Characteristics—Single Cell 4.2V
End of Charge Voltage Accuracy vs. Input Voltage
(VBAT_EOC = 4.2V)
End of Charge Voltage vs. Temperature
4.220
0.100
0.075
0.050
0.025
0.000
-0.025
-0.050
-0.075
-0.100
4.215
4.210
4.205
4.200
4.195
4.190
4.185
4.180
4
5
6
7
8
9
10
11
12
13
14
-40
-15
10
35
60
85
Input Voltage (V)
Temperature (°C)
Recharge Threshold Voltage vs. Input Voltage
Recharge Voltage vs. Temperature
(VIN = 5V; RSET = 8.87kΩ)
4.120
4.115
4.110
4.105
4.100
4.095
4.090
4.085
4.080
4.14
4.13
4.12
4.11
4.10
4.09
4.08
4.07
4.06
-40
-15
10
35
60
85
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Temperature (ºC)
Charging Current vs. Battery Voltage
Charging Current vs. Battery Voltage
(RSET = 8.87KΩ)
1200
1000
800
600
400
200
0
240
210
180
150
120
90
VIN = 12V
VIN = 7.5V
VIN = 13.2V
VIN = 9.5V
RSET = 1.78kΩ
RSET = 2.21kΩ
VIN = 5V
RSET = 3.57kΩ
RSET = 8.87kΩ
60
30
0
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
2.3
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Battery Voltage (V)
Battery Voltage (V)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Typical Characteristics—Single Cell 4.2V
Preconditioning Threshold Voltage vs. Input Voltage
Preconditioning Threshold Voltage vs. Temperature
2.70
2.68
2.66
2.64
2.62
2.60
2.58
2.56
2.54
2.52
2.50
2.70
2.68
2.66
2.64
2.62
2.60
2.58
2.56
2.54
2.52
2.50
4
5
6
7
8
9
10
11
12
13
14
-40
-15
10
35
60
85
Input Voltage (V)
Temperature (°C)
Preconditioning Charge Current
vs. Input Voltage
Constant Charge Current vs. Input Voltage
(RSET = 8.87KΩ)
120
240
230
220
210
200
RSET = 1.78kΩ
RSET = 2.21kΩ
100
80
60
40
20
0
RSET = 3.57kΩ
RSET = 8.87kΩ
VBAT = 3.5V
VBAT = 3.3V
190
180
170
160
VBAT = 3.9V
VBAT = 4.1V
4
5
6
7
8
9
10
11
12
13
14
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Input Voltage (V)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Typical Characteristics—Dual Cell 8.4V
End of Charge Voltage Accuracy vs. Input Voltage
(VBAT_EOC = 8.4V)
End of Charge Voltage vs. Temperature
(VIN = 10V; RSET = 8.87kΩ)
0.12
0.09
0.06
0.03
0.00
-0.03
-0.06
-0.09
-0.12
8.44
8.43
8.42
8.41
8.40
8.39
8.38
8.37
8.36
-40
-15
10
35
60
85
9.0
9.6
10.2
10.8
11.4
12.0
12.6
13.2
Input Voltage (V)
Temperature (°C)
End of Charge Voltage vs. Input Voltage
(RSET = 8.87kΩ)
Recharge Threshold Voltage vs. Input Voltage
8.420
8.415
8.410
8.405
8.400
8.395
8.390
8.385
8.380
8.220
8.215
8.210
8.205
8.200
8.195
8.190
8.185
8.180
9.0
9.6
10.2
10.8
11.4
12.0
12.6
13.2
8
9
10
11
12
13
14
Input Voltage (V)
Input Voltage (V)
Recharge Threshold Voltage vs. Temperature
(VIN = 10V; RSET = 8.87KΩ)
Constant Charging Current vs. Battery Voltage
(RSET = 8.87KΩ)
8.28
8.26
8.24
8.22
8.20
8.18
8.16
8.14
8.12
240
210
180
150
120
90
VIN = 10V
60
30
0
VIN = 11V
VIN = 12V
VIN = 13.2V
4.9
5.3
5.7
6.1
6.5
6.9
7.3
7.7
8.1
8.5
-40
-15
10
35
60
85
Temperature (°C)
Battery Voltage (V)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Typical Characteristics—Dual Cell 8.4V
Constant Charging Current vs. Battery Voltage
Preconditioning Threshold Voltage vs. Input Voltage
1200
5.220
5.215
5.210
5.205
5.200
5.195
5.190
5.185
5.180
1000
RSET = 1.78KΩ
800
RSET = 2.21KΩ
600
RSET = 3.57KΩ
400
200
RSET = 8.87KΩ
0
4.9
5.3
5.7
6.1
6.5
6.9
7.3
7.7
8.1
8.5
8
9
10
11
12
13
14
Battery Voltage (V)
Input Voltage (V)
Preconditioning Threshold Voltage vs. Temperature
Constant Charge Current vs. Input Voltage
(RSET = 8.87KΩ)
5.24
5.23
5.22
5.21
5.20
5.19
5.18
5.17
5.16
240
230
220
210
200
190
VBAT = 7V
VBAT = 6.6V
180
170
160
VBAT = 8.2V
-40
-15
10
35
60
85
8
9
10
11
12
13
14
Temperature (°C)
Input Voltage (V)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Functional Block Diagram
Reverse Blocking
IN
BAT
CV/
Precharge
Current
Compare
BATS
UVLO
Charge
Control
ISET
Constant
Current
TERM
Thermal
Loop
Over-Temp
Protect
Power
Detection
ADPP#
EN
STAT 1
STAT 2
Charge
Status
75µA
AAT3663-2 Only
Watchdog
Timer
CT
TS
Window Comparator
GND
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.
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
componentsꢀrequiredꢀforꢀcompleteꢀfunctionality.ꢀ
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.
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.
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
AAT3663 provides two status monitor pins, STAT1 and
STAT2.ꢀ Theseꢀ pinsꢀ areꢀ openꢀ drainꢀ MOSFETꢀ switchesꢀ
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.
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
ThisꢀopenꢀdrainꢀMOSFETꢀswitchꢀmayꢀbeꢀusedꢀtoꢀeitherꢀ
power a display LED or to alert a system microcontroller
for the presence on input power.
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.
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
Constant Voltage Charging
Constant current charging continues until such time that
the battery voltage reaches the voltage regulation point
VBAT_REG.ꢀꢀWhenꢀtheꢀbatteryꢀvoltageꢀreachesꢀVBAT_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
TERMꢀpinꢀnotꢀconnectedꢀ(openꢀcircuit),ꢀconstantꢀvoltageꢀ
charging will continue until the charge current has
reducedꢀtoꢀ10%ꢀofꢀtheꢀprogrammedꢀcurrent.ꢀꢀPlacingꢀaꢀ
resistorꢀ betweenꢀ theꢀ TERMꢀ pinꢀ andꢀ groundꢀ allowsꢀ theꢀ
user to program a desired termination current.
Whenꢀpowerꢀisꢀinitiallyꢀappliedꢀorꢀwhenꢀaꢀbatteryꢀpackꢀisꢀ
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
mustꢀbeꢀaboveꢀtheꢀminimumꢀoperatingꢀvoltageꢀ(UVLO)ꢀ
and the enable pin must be high (internally pulled
down).ꢀWhenꢀtheꢀbatteryꢀisꢀconnectedꢀtoꢀtheꢀBATꢀpinꢀtheꢀ
AAT3663 checks the condition of the battery and deter-
mines which charging mode to apply.
Battery Preconditioning
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.
If the battery voltage is below VMIN, the AAT3663 begins
batteryꢀtrickleꢀchargingꢀbyꢀchargingꢀatꢀ10%ꢀofꢀtheꢀpro-
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
MOSFETꢀisꢀminimizedꢀwhenꢀtheꢀinput-outputꢀvoltageꢀdif-
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.
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.
Preconditioning
Trickle Charge
Constant Current
Charge Phase
Constant Voltage
Charge Phase
Phase
Charge Complete Voltage
I = Max CC
Regulated Current
Constant Current Mode
Voltage Threshold
Trickle Charge and
Termination Threshold
I = CC / 10
Figure 1: Current and Voltage Profile During Charging Phases.
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
System Operation Flow Chart
Power Input
Power On
No
Voltage
Reset
VIN>VUVLO
Yes
No
Enable
EN=HIGH
FAULT
STAT1=Off
Yes
STAT2=Off
Yes
No
Fault
Expire
Condition Monitoring
VBAT<VMIN or
Yes
ShutDown
<VBAT_REG or
OV, OT,
Mode
T >VTS2
Sor
IBAT>ITERM
TS<VTS1
NNoo
Charger Timer
Control
Set
Preconditioning
Test
Yes
Yes
Preconditioning
(Trickle Charge)
VMIN >VBAT
No
Yes
Recharge
No
Constant Current
Current Phase Test
Device Temp
.
p. No
Test
VIN > VBAT_EOC
Charge Mode
Monitor
VRCH >VBAT
T >115ϒC
J
No
Yes
Thermal Loop
Current Reduction
In C.C.Mode
Yes
Constant Voltage
Voltage Phase Test
I
BAT >ITERM
Charge Mode
No
Charge
Completed
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
vide feedback to the BATS pin from the BAT connection
with a voltage sensing accuracy loss of 1mV or less.
Application Information
Adapter or USB Power Input
Enable (EN)
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.
EN is a logic input (active high) to enable the charger,
thisꢀfunctionꢀisꢀinternallyꢀpulledꢀdownꢀtoꢀground.ꢀꢀWhenꢀ
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-
grammedꢀwithꢀaꢀsetꢀresistorꢀ(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.ꢀForꢀthisꢀreason,ꢀaꢀ1%ꢀtoleranceꢀmetalꢀfilmꢀresistorꢀ
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.
Adapter Input Charge
Inhibit and Resume
TheꢀAAT3663ꢀhasꢀanꢀunder-voltageꢀlockoutꢀ(UVLO)ꢀandꢀ
power on reset feature so that if the input supply to the
INꢀpinꢀdropsꢀbelowꢀtheꢀUVLOꢀthreshold,ꢀtheꢀchargerꢀwillꢀ
suspendꢀchargingꢀandꢀshutꢀdown.ꢀWhenꢀpowerꢀisꢀreap-
pliedꢀtoꢀtheꢀINꢀpinꢀorꢀtheꢀUVLOꢀconditionꢀrecovers,ꢀtheꢀ
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.
Constant Charging
Current (mA)
Set Resistor
Value (kΩ)
100
200
300
400
500
600
700
800
900
1000
17.8
8.87
5.9
4.42
3.57
2.94
2.55
2.21
1.96
1.78
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 10kW
resistor. Under normal operation, the connection to the
battery terminal will be close to 0W; if the BATS connec-
tion becomes an open circuit, the 10kW resistor will pro-
Table 1: RSET Values.
If the desired charge current level is not listed in Table
1,ꢀtheꢀRSET resistor value can be found in Figure 2 and
calculatedꢀbyꢀtheꢀfollowingꢀequation:ꢀ
VISET
RSET = K ·
ICC
Where:
K = KI_SET = 900
VISET = 2V
ICC = Fast charge constant current
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
50
45
40
35
30
25
20
15
10
5
10000
1000
100
10
0
1
0
10
20
30
40
50
60
1
10
100
RTERM (kΩ)
RSET (kΩ)
Figure 2: Constant Charging Current vs. RSET
Resistor Values.
Figure 3: Charge Termination Current (% Value of
the Programmed Fast Charge Current) vs. RTERM
Resistance.
Programmable Charge
Termination Current
Battery Charge Status Indication
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
levelꢀotherꢀthanꢀ10%ꢀofꢀtheꢀsetꢀfastꢀchargeꢀcurrentꢀbyꢀ
connectingꢀaꢀsetꢀresistorꢀ(RTERM)ꢀbetweenꢀtheꢀTERMꢀpinꢀ
and ground.
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
Whenꢀ theꢀ chargeꢀ currentꢀ underꢀ theꢀ constantꢀ voltageꢀ
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
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-channelꢀMOSFETꢀswitchesꢀtoꢀconnectꢀtheꢀstatusꢀLEDꢀ
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
moreꢀinformationꢀforꢀtheꢀvariousꢀchargingꢀstates.ꢀꢀReferꢀ
to Table 2 for LED display definitions.
(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
determinedꢀbyꢀtheꢀfollowingꢀequation:
Event Description
STAT1
STAT2
15µA · RTERM
Charge enabled without battery
Flash1
Flash1
ICH_TERM
=
· ICH_CC
2V
Battery charging
Charging completed
Fault
ON
OFFꢀ
OFF
OFF
ON
OFF
Where:
ICH_TERM = Charge termination current level
ICH_CC = Programmed fast charge constant current level
RTERMꢀ=ꢀTERMꢀresistorꢀvalue
Table 2: LED Status Indicator Truth Table.
1. Flashing rate depends on output capacitance.
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
The LED anodes should be connected to the charger
factor of 0.28. The initial thermal loop current can be
power source input (IN pin).
estimatedꢀbyꢀtheꢀfollowingꢀequation:ꢀ
Input Power Present Indicator
ITLOOP = ICH_CC · 0.28
The ADDP# pin provides an additional open drain
N-channelꢀ MOSFETꢀ switchꢀ toꢀ indicateꢀ theꢀ presenceꢀ ofꢀ
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.
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-
rentꢀ levelꢀ orꢀ untilꢀ anꢀ equilibriumꢀ currentꢀ isꢀ discoveredꢀ
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.
Status Display LED Biasing
Protection Circuitry
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.
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,ꢀaꢀ0.1μFꢀceramicꢀcapacitorꢀisꢀconnectedꢀ
betweenꢀtheꢀCTꢀpinꢀandꢀground.ꢀWhenꢀaꢀ0.1μFꢀceramicꢀ
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
modeꢀ ofꢀ 3ꢀ hours.ꢀ Whenꢀ theꢀ deviceꢀ transitionsꢀ toꢀ theꢀ
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.
Theꢀ requiredꢀ ballastꢀ resistorꢀ valuesꢀ canꢀ beꢀ estimatedꢀ
using the following formula:
(VIN
-
VF(LED)
ILED
)
RBALLAST
=
The AAT3663 has a battery fault detector, which, when
usedꢀinꢀconjunctionꢀwithꢀaꢀ0.1μFꢀcapacitorꢀonꢀtheꢀCTꢀpin,ꢀ
outputsꢀaꢀ1Hzꢀsignalꢀwithꢀ50%ꢀdutyꢀcycleꢀatꢀtheꢀSTAT1ꢀ
pin in the event of a timeout while in the trickle charge
mode.
Example:
(5.0V - 2.0V)
RBALLAST
=
= 1.5kΩ
2mA
Note:ꢀRedꢀLEDꢀforwardꢀvoltageꢀ(VF) is typically 2.0V @
2mA.
Mode
Time
TrickleꢀChargeꢀ(TC)ꢀTimeꢀOut
25 minutes
Trickle Charge (TC) + Constant Current (CC)
3 hours
3 hours
ModeꢀTimeꢀOut
ConstantꢀVoltageꢀ(CV)ꢀModeꢀTimeꢀOut
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
controlꢀthreshold.ꢀOnceꢀtheꢀthermalꢀloopꢀcontrolꢀbecomesꢀ
active, the fast charge current is initially reduced by a
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
doubledꢀfromꢀtheꢀnominalꢀ0.1μFꢀvalue,ꢀtheꢀtimeoutꢀperi-
ods would be doubled. If the programmable watchdog
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
timer function is not needed, it can be disabled by ter-
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.
ReferꢀtoꢀtheꢀElectricalꢀCharacteristicsꢀtableꢀforꢀtheꢀTS1ꢀ
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.
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%ꢀ toleranceꢀ orꢀ betterꢀ ceramicꢀ capacitorꢀ isꢀ recom-
mended.ꢀCeramicꢀcapacitorꢀmaterials,ꢀsuchꢀasꢀX7Rꢀandꢀ
X5Rꢀtypes,ꢀareꢀaꢀgoodꢀchoiceꢀforꢀthisꢀapplication.
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.
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
theꢀTS1ꢀandꢀTS2ꢀspecifications.ꢀReferringꢀtoꢀtheꢀelectri-
cal characteristics table in this datasheet, the TS1
threshold = 0.30 · VIN and the TS2 threshold = 0.6 · VIN.
ReferꢀtoꢀFigureꢀ4ꢀforꢀexternalꢀresistorꢀandꢀNTCꢀthermis-
tor connections.
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-
downꢀthreshold.ꢀOnceꢀtheꢀinternalꢀdieꢀtemperatureꢀfallsꢀ
below the hysteresis, normal operation will resume the
previous charging state.
If the use of the battery temperature sense function is
notꢀrequired,ꢀitꢀmayꢀbeꢀdisabledꢀbyꢀterminatingꢀtheꢀTSꢀ
pin to IN and ground using a 10kW resistor divider net-
work. If circuit power dissipation is a concern, the two
terminating resistor values may be increased to 100kW.
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
10kW NTC resistors and eliminates the need for a resistor
divider pull up to the input power source.
AAT3663-2 Option
Most of the commonly used NTC thermistors in Li-Ion/
Polymerꢀbatteryꢀpacksꢀareꢀapproximatelyꢀ10kΩꢀatꢀroomꢀ
temperature (25°C). The AAT3663-2 TS pin has been
specificallyꢀ designedꢀ toꢀ sourceꢀ 75µAꢀ ofꢀ currentꢀ toꢀ theꢀ
10kW 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 10kW 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).
RegardlessꢀofꢀtheꢀAAT3663ꢀoptionꢀselected,ꢀtheꢀinternalꢀ
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)
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
VIN
AAT3663-4.2-1 or AAT3663-8.4-1
IN
0.6xVIN
RT
Battery Cold Fault
TS
Battery
Pack
Battery Hot Fault
RNTC
T
0. 30xVIN
Figure 4: External Resistor and NTC Thermistor Application Circuit.
Thermal Considerations
2.50
2.00
1.50
1.00
0.50
0.00
The AAT3663 is offered in a 3x3mm TDFN package which
canꢀprovideꢀupꢀtoꢀ2.0Wꢀofꢀpowerꢀdissipationꢀwhenꢀitꢀisꢀ
properly bonded to a printed circuit board and has a
maximumꢀthermalꢀresistanceꢀofꢀ50°C/W.ꢀManyꢀconsider-
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.
0
25
50
75
100
TA (°C)
Figure 5: Maximum Power Dissipation Before
Entering Thermal Loop.
Next, the power dissipation can be calculated by the fol-
lowingꢀequation:
First, the maximum power dissipation for a given situa-
tion should be calculated:
(TJ
-
TA)
(PD(MAX)
-
VIN
·
IOP)
PD(MAX)
=
ICH(MAX)
=
θ
VIN - VBAT
JA
Where:
(TJ
-
TA)
-
VIN
·
IOP
PD(MAX)ꢀ =ꢀMaximumꢀPowerꢀDissipationꢀ(W)
θ
JA
θJAꢀ
TJ
=ꢀPackageꢀThermalꢀResistanceꢀ(°C/W)
= Thermal Loop Entering Threshold (ºC) [115ºC]
= Ambient Temperature (°C)
ICH(MAX)
=
VIN - VBAT
TA
Where:
Figure 5 shows the relationship between maximum
power dissipation and ambient temperature of AAT3663
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
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
IOP = Quiescent Current Consumed by the Charger IC
Capacitor Selection
Input Capacitor
ꢀ ꢀ forꢀNormalꢀOperationꢀ[0.5mA]ꢀ
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, it is a good design practice to place a decou-
pling capacitor between the IN pin and ground. An input
capacitorꢀinꢀtheꢀrangeꢀofꢀ1μFꢀtoꢀ22μFꢀisꢀrecommended.ꢀ
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 CINꢀcapacitorꢀinꢀtheꢀrangeꢀofꢀ10μFꢀshouldꢀ
be used. A larger input capacitor in this application will
minimize switching or power transient effects when the
power supply is “hot plugged” in.
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.ꢀ ꢀ Whenꢀ underꢀ digitalꢀ thermalꢀ loopꢀ operation,ꢀ theꢀ
device will remain active and continue to charge the bat-
tery at a reduced current level for the given ambient
condition.
Output Capacitor
TheꢀAAT3663ꢀonlyꢀrequiresꢀaꢀ1μFꢀceramicꢀcapacitorꢀonꢀ
the BAT pin to maintain circuit stability. This value should
beꢀincreasedꢀtoꢀ10μFꢀorꢀmoreꢀifꢀtheꢀbatteryꢀconnectionꢀisꢀ
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
chargingꢀcradles,ꢀanꢀoutputꢀcapacitorꢀ10μFꢀorꢀgreaterꢀisꢀ
recommended to reduce the effect of the charger cycling
on and off when no battery is present.
1000
800
TA = 85°C TA = 60°C
600
TA = 45°C
Printed Circuit Board
Layout Considerations
TA = 25°C
400
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
currentꢀ carryingꢀ tracesꢀ adequatelyꢀ wide.ꢀ Forꢀ maximumꢀ
power dissipation of the AAT3663 3 × 3mm 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
increaseꢀ localꢀ heatꢀ dissipation.ꢀ Referꢀ toꢀ theꢀ AAT3663ꢀ
evaluation board for a good layout example.
200
0
4
5
6
7
8
9
10
11
12
13
VIN (V)
Figure 6: Maximum Charging Current Before the
Digital Thermal Loop Becomes Active.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Figure 7: AAT3663 Evaluation Board
Figure 8: AAT3663 Evaluation Board
Bottom Side Layout.
Top (Component) Side Layout.
JP1
ENABLE
JP4
VIN
Green
LED
Red
LED
Red
LED
R7
D3
D2
D1
U1
(see note)
TDFN33-14 AAT3663
JP3
JP2
1
12
11
10
5
TS
EN
TS
R4 2k
ADPP#
STAT1
STAT2
IN
IN
GND
13
6
R5 2k
TERM
BATS
BAT
R6 2k
VIN
4V - 13.2V
7
3
2
8
9
4
BAT
ISET
CT
C2
10µF
R3
10k
EP
C1
10µF
R2
10k
R1
1.74k
C3
0.1µF
GND
GND
C1 1206 X7R 10µF 16V GRM31CR71C106KAC7L
C2 0805 X7R 10µF 10V GRM21BR71A106KE51L
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)
Figure 9: AAT3663 Evaluation Board Schematic Diagram.
Skyworks Solutions, Inc.
• Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 11, 2012
DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Ordering Information
Battery Cell
Voltage Option
Battery Temperature Sense
Package
Marking1 Part Number (Tape and Reel)2
Single Cell (4.2V)
Single Cell (4.2V)
Dual Cell (8.4V)
Dual Cell (8.4V)
ForꢀUseꢀWithꢀAnyꢀNTCꢀThermistorꢀ
ForꢀUseꢀWithꢀ10kΩꢀNTCꢀThermistorꢀ
ForꢀUseꢀWithꢀAnyꢀNTCꢀThermistor
ForꢀUseꢀWithꢀ10kΩꢀNTCꢀThermistorꢀ
TDFN33-14
TDFN33-14
TDFN33-14
TDFN33-14
1XXYY
ZZXYY
1YXYY
1ZXYY
AAT3663IWO-4.2-1-T1
AAT3663IWO-4.2-2-T1
AAT3663IWO-8.4-1-T1
AAT3663IWO-8.4-2-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
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DATA SHEET
AAT3663
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
Package Information
TDFN33-14
Detail "A"
Index Area
1.650 0.050
3.000 0.050
Top View
Bottom View
0.425 0.050
+ 0.100
0.000
- 0.000
Pin 1 Indicator
(Optional)
Side View
Detail "A"
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.ꢀꢀAꢀsolderꢀfilletꢀatꢀtheꢀexposedꢀcopperꢀedgeꢀcannotꢀbeꢀguaranteedꢀandꢀisꢀnotꢀrequiredꢀtoꢀensureꢀaꢀproperꢀbottomꢀsolderꢀconnection.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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