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AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger General Description
The AAT3681A BatteryManager is an integrated single cell lithium-ion/polymer battery charger IC, designed to operate from a DC power source or USB port up to an input voltage of 7.5V. It requires just one external component. The AAT3681A precisely regulates battery charge voltage and current for 4.2V (4.375V option) lithiumion/polymer battery cells. When charged from an AC adapter or USB port, the battery charging current can be set by an external resistor up to 500mA. Battery charge state is continuously monitored for fault conditions. In the event of an over-voltage, short-circuit, or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. A status monitor output pin is provided to indicate the battery charge status by directly driving an external LED. The AAT3681A is available in a Pb-free, thermally enhanced, space-saving 8-pin 2.0x2.1mm SC70JW package and is specified for operation over the -40C to +85C temperature range.
Features
* * *
BatteryManagerTM
* * * * *
* * * *
USB or AC Adapter System Power Charger -- Programmable from 15mA to 500mA 4.0V ~ 7.5V Input Voltage Range High Level of Integration with Internal: -- Charging Device -- Reverse Blocking Diode Automatic Current Sensing Automatic Recharge Sequencing Full Battery Charge Auto Turn Off/Sleep Mode/Charge Termination Shutdown Current <1A Automatic Trickle Charge for Battery PreConditioning (AAT3681A-1 is No Trickle Charge Option) Over-Voltage and Emergency Thermal Protection Power On Reset and Soft Start LED Status Pin 8-Pin 2.0x2.1mm SC70JW Package
Applications
* * * * * * * Bluetooth(R) Headsets DECT Headsets Digital Still Cameras MP3, Portable Music, and Portable Media Players Personal Data Assistants (PDAs) Wrist Watches Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
Adapter/USB Input
ADP BAT C
BATT+
AAT3681A
Enable
STAT EN ISET GND
BATTBattery Pack
RSET
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1
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Pin Description
Pin #
1
Symbol
EN
Type
In
Function
Enable pin. AAT3681A, AAT3681A-1: Logic high enables the IC (internally pulled down). AAT3681A-2: Logic low enables the IC (internally pulled down). AAT3681A-3: Logic low enables the IC (no internal pull-down resistor). Connect resistor here to set the charge current. Battery charging and sensing. Input from USB/adapter charger. Open drain status pin. Ground connection.
2 3 4 5 6, 7, 8
ISET BAT ADP STAT GND
In/Out In/Out Power In Out Power
Pin Configuration
SC70JW-8 (Top View) EN ISET BAT ADP GND GND GND STAT
1 2 3 4
8 7 6 5
2
3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger AAT3681A Feature Options
Product
AAT3681A AAT3681A-1 AAT3681A-2 AAT3681A-3
Trickle Charge
Yes No Yes Yes
Enable
Active High Active High Active Low Active Low
Charge Termination Threshold Current
10% 10% 10% 0
Absolute Maximum Ratings1
Symbol
VP VN TJ TLEAD
Description
ADP Continuous BAT, STAT, ISET, EN Operating Junction Temperature Range Maximum Soldering Temperature (at Leads)
Value
-0.3 to 8.0 -0.3 to VP + 0.3 -40 to 150 300
Units
V V C C
Thermal Information2
Symbol
PD JA
Description
Maximum Power Dissipation Maximum Thermal Resistance
Value
0.687 160
Units
W C/W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. 3681A.2007.10.1.2
3
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1
VADP = 5V, TA = -25C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol
Operation VADP VUVLO IOP ISHUTDOWN
Description
Adapter Voltage Range Under-Voltage Lockout (UVLO) UVLO Hysteresis Operating Current
Conditions
Min
4.0 3
Typ
Max Units
7.5 4 V V mV mA
Rising Edge Charge Current = 200mA VBAT = 4.25V, VEN = GND (AAT3681A, AAT3681A-1) VBAT = 4.25V, VEN = 5V (AAT3681A-2, AAT3681A-3) VBAT = 4V, ADP Pin Open
150 0.5
1
Shutdown Current
0.3
1
A
ILEAKAGE Reverse Leakage Current from BAT Pin Voltage Regulation VBAT_EOC End of Charge Accuracy VCH/VCH Output Charge Voltage Tolerance VMIN VRCH Preconditioning Voltage Threshold
0.4 4.158 4.20 0.5 3.0
2 4.242
A V % V
Battery Recharge Voltage Threshold
AAT3681A, AAT3681A-2, and AAT3681A-3 Only Measured from VBAT_EOC AAT3681A, AAT3681A-1, and AAT3681A-2 Only
2.85
3.15
-0.1
V
Current Regulation ICH Charge Current Programmable Range2 ICH/ICH Charge Current Regulation Tolerance VSET ISET Pin Voltage KI_A Current Set Factor: ICH/ISET Charging Devices RDS(ON) Charging Transistor On Resistance Logic Control/Protection VEN(H) Input High Threshold VEN(L) Input Low Threshold VSTAT Output Low Voltage ISTAT STAT Pin Current Sink Capability VOVP Over-Voltage Protection Threshold ITK/ICH ITERM/ICH Pre-Charge Current
15 10 2 800 VADP = 5.5V 1.6 STAT Pin Sinks 4mA 4.4 ICH = 100mA; AAT3681A, AAT3681A-2, and AAT3681A-3 Only AAT3681A, AAT3681A-1, and AAT3681A-2 Only 10 0.6
500
mA % V
1
V V V mA V %
0.4 0.4 8
Charge Termination Threshold Current
10
%
1. The AAT3681A output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C temperature range is guaranteed by design. 2. Achievable charge current may be limited by power dissipation capability of the package under certain operating conditions. See "Thermal Considerations" section of this datasheet.
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3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Constant Charging Current vs. Set Resistor Values
1000 600 500 100 400 300 200 100 1 0 1 10 100 1000 RSET = 8.06k RSET = 16.2k RSET = 31.6k 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 RSET = 3.24k
Charging Current vs. Battery Voltage
(AAT3681A, AAT3681A-2 and AAT3681A-3 only)
ICH (mA)
10
ICH (mA)
RSET = 5.36k
RSET (k)
VBAT (V)
Charging Current vs. Battery Voltage
(AAT3681A-1 only)
600 4.220 RSET = 3.24k 4.215
End of Charge Battery Voltage vs. Input Voltage
Battery Voltage (V)
500 400 300 200 100 0
4.210 4.205 4.200 4.195 4.190 4.185 4.180 4.5 5.0 5.5 6.0 6.5 7.0 7.5
ICH (mA)
RSET = 5.36k RSET = 8.06k RSET = 16.2k RSET = 31.6k 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3
VBAT (V)
Input Voltage (V)
End of Charge Voltage Regulation vs. Temperature
(RSET = 8.06k)
4.23 4.22
Constant Charging Current vs. Input Voltage
(RSET = 8.06k)
280
Charging Current (mA)
260 240 220 200 180 160 140 120 4
VBAT_EOC (V)
4.21 4.20 4.19 4.18 4.17
VBAT = 3.3V
VBAT = 3.6V VBAT = 4.0V
4.5 5 5.5 6 6.5 7 7.5
-50
-25
0
25
50
75
100
Temperature (C)
Input Voltage (V)
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AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Constant Charging Current vs. Temperature
(RSET = 8.06k)
210 208 205 1000
Operating Supply Current vs. RSET
(VIN = 5V) VBAT = 3.6V ISUPPLY (A)
100
ICH (mA)
203 200 198 195 193 190 -50 -25 0 25 50 75 100
VBAT = 2.85V
10
1
1
10
100
Temperature (C)
RSET (k)
Operating Current vs. Temperature
(RSET = 8.06k)
550 500
(RSET = 8.06k; AAT3681A, AAT3681A-2, and AAT3681A-3 Only)
3.03 3.02
Preconditioning Threshold Voltage vs. Temperature
VMIN (V)
IOP (A)
450 400 350 300 -50
3.01 3 2.99 2.98 2.97 -50
-25
0
25
50
75
100
-25
0
25
50
75
100
Temperature (C)
Temperature (C)
Trickle Charge Current (mA)
(RSET = 8.06k; AAT3681A, AAT3681A-2, and AAT3681A-3 Only)
20.8 20.6
Preconditioning Charge Current vs. Temperature
Preconditioning Charge Current vs. Input Voltage
(AAT3681A, AAT3681A-2, and AAT3681A-3 Only)
35 30 25 20 15 10 5 0 4
RSET = 5.36k RSET = 8.06k RSET = 16.2k RSET = 31.6k
4.5 5 5.5 6 6.5 7 7.5
ITRICKLE (mA)
20.4 20.2 20.0 19.8 19.6 19.4 19.2 -50 -25 0 25 50 75 100
Temperature (C)
Input Voltage (V)
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3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
(RSET = 8.06k; AAT3681A, AAT3681A-1 and AAT3681A-2 only) ;
4.16 4.14
Recharging Threshold Voltage vs. Temperature
Shutdown Current vs. Supply Voltage
(RSET = 8.06k)
1800
Shutdown Current (nA)
4.18
1600 1400 1200 1000 800 600 400 200 0 4.0 4.5 5.0
VRCH (V)
85C
4.12 4.10 4.08 4.06 4.04 4.02 -50 -25 0 25 50 75 100
25C
5.5 6.0 6.5
-40C
7.0 7.5
Temperature (C)
Supply Voltage (V)
VIH_ENABLE vs. Supply Voltage
(RSET = 8.06k)
1.5 1.4 1.3 1.2 1.1
VIL_ENABLE vs. Supply Voltage
(RSET = 8.06k)
-40C
VIH_ENABLE (V)
VIL_ENABLE (V)
1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 4.0 4.5
-40C
1.0 0.9 0.8 0.7 0.6 0.5
25C
5.0 5.5 6.0
85C
25C
85C
6.5
7.0
7.5
0.4 4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
VIN (V)
VIN (V)
3681A.2007.10.1.2
7
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Functional Block Diagram
Reverse Blocking
ADP
BAT
Current Compare
CV/ Precharge
ISET
Constant Current
Charge Control
UVLO
STAT
Charge Status
OverTemperature Protection
EN
GND
Functional Description
The AAT3681A is a high performance battery charger designed to charge single cell lithiumion/polymer batteries with up to 500mA of current from an external power source. It is a stand-alone charging solution, with just one external component required for complete functionality. The AAT3681A precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. The adapter/USB charge input constant current level can be programmed up to 500mA for rapid charging applications. The AAT3681A is rated for operation from -40C to +85C. In the event of operating ambient temperatures exceeding the power dissipation abilities of the device package for a given constant current charge level, the charge control will enter into thermal limit.
A status monitor output pin is provided to indicate the battery charge state by directly driving one external LED. Device junction temperature and charge state are fully monitored for fault conditions. In the event of an over-voltage or over-temperature failure, the device will automatically shut down, protecting the charging device, control system, and the battery under charge.
Charging Operation
The AAT3681A has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; constant current/fast charge; constant voltage; and end of charge. (See Figure 1.) (AAT3681A-1 does not have trickle charge.)
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3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Preconditioning Trickle Charge Phase Charge Complete Voltage Regulated Current I = Max CC
Constant Current Charge Phase
Constant Voltage Charge Phase
Constant Current Mode Voltage Threshold
Trickle Charge and Termination Threshold
I = CC / 10
Figure 1: Current vs. Voltage Profile During Charging Phases.
Battery Preconditioning Before the start of charging, the AAT3681A checks several conditions in order to assure a safe charging environment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (VUVLO), for the charging sequence to begin. When these conditions have been met and a battery is connected to the BAT pin, the AAT3681A checks the state of the battery. If the cell voltage is below the preconditioning voltage threshold (VMIN), the charge control begins preconditioning the cell. The battery preconditioning trickle charge current is equal to the fast charge constant current divided by 10. For example, if the programmed fast charge current is 300mA, then the preconditioning mode (trickle charge) current will be 30mA. Cell preconditioning is a safety precaution for deeply discharged battery cells and also aids in limiting power dissipation in the pass transistor when the voltage across the device is at the greatest potential. Constant Current Charging Battery cell preconditioning continues until the voltage on the BAT pin exceeds the preconditioning voltage threshold (VMIN). At this point, the AAT3681A begins the constant current charging phase. The charge constant current (ICH) amplitude is programmed by the user via the RSET resistor. The AAT3681A remains in the constant current charge mode until the battery reaches the voltage regulation point, VBAT_EOC.
Constant Voltage Charging The system transitions to a constant voltage charging mode when the battery voltage reaches the output charge regulation threshold (VBAT_EOC) during the constant current fast charge phase. The regulation voltage level is factory programmed to 4.2V (0.5%). Charge current in the constant voltage mode drops as the battery cell under charge reaches its maximum capacity. End of Charge Cycle Termination and Recharge Sequence When the charge current drops to 10% of the programmed fast charge current level in the constant voltage mode, the device terminates charging and goes into a sleep state. The charger will remain in a sleep state until the battery voltage decreases to a level below the battery recharge voltage threshold (VRCH). (AAT3681A-3 does not terminate charging and thus does not go into the sleep state. AAT3681A-3 continues to source current to the battery and allows the charge current to asymptotically approach zero while in constant voltage charging mode.) Consuming very low current in sleep state, the AAT3681A minimizes battery drain when it is not charging. This feature is particularly useful in applications where the input supply level may fall below the battery charge or under-voltage lockout level. In such cases where the AAT3681A input voltage drops, the device will enter sleep state and automatically resume charging once the input supply has recovered from the fault condition.
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AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
System Operation Flow Chart
Enable
Power On Reset
No
Yes
Power Input Voltage VIN > VUVLO
Yes
Shut Down
Yes
Fault Conditions Monitoring OV, OT
Charge Control
No (AAT3681A, AAT3681A-2, AAT3681A-3) No (AAT3681A-1) Preconditioning Test V MIN > VBAT
Yes
Preconditioning (Trickle Charge)
No No Recharge Test V RCH > VBAT Yes Current Phase Test V BAT_EOC > VBAT Yes Constant Current Charge Mode
No
Yes Voltage Phase Test IBAT > ITERM No (AAT3681A-3) No (AAT3681A, AAT3681A-1, AAT3681A-2) Charge Completed
Constant Voltage Charge Mode
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3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Application Information
Adapter or USB Power Input
Constant current charge levels up to 500mA may be programmed by the user when powered from a sufficient input power source. The AAT3681A will operate from the adapter input over a 4.0V to 7.5V range. The constant current fast charge current for the adapter input is set by the RSET resistor connected between ISET and ground. Refer to Table 1 for recommended RSET values for a desired constant current charge level. Adapter Input Charge Inhibit and Resume The AAT3681A has a UVLO and power on reset feature so that if the input supply to the ADP pin drops below the UVLO threshold, the charger will suspend charging and shut down. When power is re-applied to the ADP 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. charge state and measured cell voltage on the BAT pin.
Programming Charge Current
The fast charge constant current charge level is user programmed with a set resistor placed between the ISET pin and ground. The accuracy of the fast charge, as well as the preconditioning trickle charge current, 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. Fast charge constant current levels from 15mA to 500mA may be set by selecting the appropriate resistor value from Table 1. Nominal ICHARGE (mA)
500 450 400 350 300 250 200 150 100 50 40 30 20 15
Set Resistor Value (k)
3.24 3.57 4.12 4.64 5.36 6.49 8.06 10.7 16.2 31.6 38.3 53.6 78.7 105
Enable / Disable
The AAT3681A provides an enable function to control the charger IC on and off. The EN pin functions as follows on the various AAT3681A options: AAT3681A and AAT3681A-1: The enable (EN) pin is internally pulled down. When pulled to a logic high level, the AAT3681A is enabled. When left open or pulled to a logic low level, the AAT3681A will be shut down and forced into the sleep state. AAT3681A-2: The enable (EN) pin is internally pulled down. When left open or pulled to a logic low level, the AAT3681A-2 is enabled. When pulled to a logic high level, the AAT3681A-2 will be shut down and forced into the sleep state. AAT3681A-3: The enable (EN) pin is not internally pulled down. When pulled to a logic low level, the AAT3681A-3 is enabled. When pulled to a logic high level, the AAT3681A-3 will be shut down and forced into the sleep state. Charging will be halted regardless of the battery voltage or charging state. When the device is reenabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on the battery
3681A.2007.10.1.2
ICH (mA)
Table 1: RSET Values.
1000
100
10
1
1
10
100
1000
RSET (k)
Figure 2: Constant Charging Current vs. Set Resistor Values. 11
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Protection Circuitry
Over-Voltage Protection An over-voltage event is defined as a condition where the voltage on the BAT pin exceeds the maximum battery charge voltage and is set by the over-voltage protection threshold (VOVP). If an overvoltage condition occurs, the AAT3681A charge control will shut down the device until voltage on the BAT pin drops below VOVP. The AAT3681A will resume normal charging operation after the overvoltage condition is removed. Over-Temperature Shutdown The AAT3681A has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. Once the internal die temperature falls below the thermal limit, normal operation will resume the previous charging state. The required ballast resistor values can be estimated using the following formulas:
R 1=
Example:
(VADP - VF(LED)) ILED
R1 =
(5.5V - 2.0V) = 1.75k 2mA
Note: Red LED forward voltage (VF) is typically 2.0V @ 2mA.
Thermal Considerations
The AAT3681A is offered in a SC70JW-8 package which can provide up to 687mW of power dissipation when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 160C/W. Many considerations 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 generating devices in a given application design. The ambient temperature around the charger IC will also have an effect on the thermal limits of a battery charging application. 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 situation should be calculated:
Charge Status Output
The AAT3681A provides battery charge status via a status pin. This pin is internally connected to an Nchannel open drain MOSFET, which can be used to drive an external LED. The status pin can indicate the following conditions: Event Description
No battery charging activity Battery charging via adapter or USB port Charging completed1
Status
OFF ON OFF
Table 2: LED Status Indicator. The LED should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast 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 package, 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.
PD(MAX) =
Where:
(TJ(MAX) - TA) JA
PD(MAX) = Maximum Power Dissipation (W) JA = Package Thermal Resistance (C/W) TJ(MAX) = Maximum Device Junction Temperature (C) [135C] TA = Ambient Temperature (C)
1. AAT3681A-3 does not terminate charging. However, the status pin turns off when IBAT ITERM and turns back on when VBAT VBAT_EOC - 0.1V.
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3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Figure 3 shows the relationship of maximum power dissipation and ambient temperature of AAT3681A.
1000 800
In general, the worst condition is the greatest voltage drop across the charger IC, when battery voltage is charged up to the preconditioning voltage threshold. Figure 4 shows the maximum charge current in different ambient temperatures without PCB thermal enhancements.
500
PD(MAX) (mW)
600 400 450 400 350 300 250 200 150 100 50
ICH(MAX) (mA)
200 0 0 20 40 60 80 100
TA = 25C TA = 45C
TA (C)
TA = 85C
4.5 4.75
Figure 3: Maximum Power Dissipation. Next, the power dissipation can be calculated by the following equation: PD = [(VIN - VBAT) * ICH + (VIN * IOP)] Where: PD = Total Power Dissipation by the Device VIN = Input Voltage VBAT = Battery Voltage as Seen at the BAT Pin ICH IOP = Constant Charge Current Programmed for the Application = Quiescent Current Consumed by the Charger IC for Normal Operation [0.5mA]
0 4.25
TA = 60C
5 5.25 5.5 5.75 6 6.25 6.5 6.75 7
VIN (V)
Figure 4: Maximum Charging Current Before Thermal Cycling Becomes Active.
Capacitor Selection
Input Capacitor In general, it is good design practice to place a decoupling capacitor between the ADP pin and GND. 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 AAT3681A adapter input is to be used in a system with an external 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 AAT3681A 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 AAT3681A is to be used in applications where the battery can be removed from the charger, such as with desktop charging cradles, an output capacitor greater than 10F may be required to prevent the device from cycling on and off when no battery is present.
By substitution, we can derive the maximum charge current before reaching the thermal limit condition (thermal cycling). The maximum charge current is the key factor when designing battery charger applications.
ICH(MAX) =
(PD(MAX) - VIN * IOP) VIN - VBAT
(TJ(MAX) - TA) - V * I IN OP JA ICH(MAX) = VIN - VBAT
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AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Printed Circuit Board Layout Considerations
For the best results, it is recommended to physically place the battery pack as close as possible to the AAT3681A BAT pin. To minimize voltage drops on the PCB, keep the high current carrying traces adequately wide. Refer to the AAT3681A evaluation board for a good layout example (see Figures 5 and 6).
Figure 5: AAT3681A Evaluation Board Top Layer.
Figure 6: AAT3681A Evaluation Board Bottom Layer.
VBAT
VIN(ADP)
JP2 AAT3681A
1 2 3 4
C1 10F
R8 8.06K
EN ISET BAT ADP
GND GND GND STAT
8 7 6 5
C2 2.2F
U1 (SC70JW-8) JP1 0 RED LED D1 R1 1K
Figure 7: AAT3681A Evaluation Board Schematic Diagram.
14
3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Component
U1 R1 R8 JP1 C1 C2 JP2 LED1
Part Number
AAT3681AIJS-T1 Chip Resistor Chip Resistor Chip Resistor GRM21BR61A106KE19L GRM21BR71A225KA01L PRPN401PAEN CMD15-21SRC/TR8
Description
USB/ADP Battery Charger; SC70JW-8 Package 1k, 5%, 1/4W; 0603 8.06k, 1%, 1/4W; 0805 0, 5%, 1/4W; 0603 CER 10F 10V 10% X5R 0805 CER 2.2F 10V 10% X7R 0805 Connecting Header, 2mm Zip Red LED; 1206
Manufacturer
AnalogicTech Vishay Vishay Vishay Murata Murata Sullins Electronics Chicago Miniature Lamp
Table 3: AAT3681A Evaluation Board Bill of Materials.
3681A.2007.10.1.2
15
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Ordering Information
Trickle Charge
Yes No Yes Yes
Enable
Active High Active High Active Low Active Low
Package
SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8
Marking1
UTXYY UEXYY VSXYY XBXYY
Part Number (Tape and Reel)2
AAT3681AIJS-4.2-T1 AAT3681AIJS-4.2-1-T1 AAT3681AIJS-4.2-2-T1 AAT3681AIJS-4.2-3-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/pbfree.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.
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3681A.2007.10.1.2
AAT3681A
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Package Information
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
1.75 0.10 0.225 0.075 2.00 0.20
2.20 0.20
0.048REF 0.85 0.15 0.15 0.05
1.10 MAX
0.100
7 3
0.45 0.10 2.10 0.30
4 4
All dimensions in millimeters.
(c) 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 specifications 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 fitness 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. Specific 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 brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
3681A.2007.10.1.2
0.05 0.05
17

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