AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger General Description Features 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 -40°C to +85°C temperature range. • • • • • • • • • • • BatteryManager™ 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 <1µA 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® 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 BATT+ ADP BAT C AAT3681A Enable BATTBattery Pack STAT EN ISET GND RSET 3681A.2007.10.1.2 1 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Pin Description Pin # Symbol Type 1 EN In 2 3 4 5 6, 7, 8 ISET BAT ADP STAT GND In/Out In/Out Power In Out Power 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. Pin Configuration SC70JW-8 (Top View) EN ISET BAT ADP 2 1 8 2 7 3 6 4 5 GND GND GND STAT 3681A.2007.10.1.2 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger AAT3681A Feature Options Product Trickle Charge Enable Charge Termination Threshold Current AAT3681A AAT3681A-1 AAT3681A-2 AAT3681A-3 Yes No Yes Yes Active High Active High Active Low Active Low 10% 10% 10% 0 Absolute Maximum Ratings1 Symbol VP VN TJ TLEAD Description Value Units -0.3 to 8.0 -0.3 to VP + 0.3 -40 to 150 300 V V °C °C Description Value Units Maximum Power Dissipation Maximum Thermal Resistance 0.687 160 W °C/W ADP Continuous BAT, STAT, ISET, EN Operating Junction Temperature Range Maximum Soldering Temperature (at Leads) Thermal Information2 Symbol PD θJA 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 = -25°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Operation VADP VUVLO IOP ISHUTDOWN Description Adapter Voltage Range Under-Voltage Lockout (UVLO) UVLO Hysteresis Operating Current Shutdown Current ILEAKAGE Reverse Leakage Current from BAT Pin Voltage Regulation VBAT_EOC End of Charge Accuracy ΔVCH/VCH Output Charge Voltage Tolerance VMIN Preconditioning Voltage Threshold VRCH Battery Recharge Voltage Threshold Current Regulation ICH Charge Current Programmable Range2 ΔICH/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 Charge Termination Threshold Current Conditions Min Rising Edge 4.0 3 Max Units 150 0.5 1 V V mV mA 0.3 1 µA 0.4 2 µA 4.158 4.20 0.5 4.242 V % 2.85 3.0 3.15 V 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 AAT3681A, AAT3681A-2, and AAT3681A-3 Only Measured from VBAT_EOC AAT3681A, AAT3681A-1, and AAT3681A-2 Only Typ 7.5 4 -0.1 15 V 500 mA % V 1 Ω 0.4 0.4 8 4.4 V V V mA V 10 % 10 % 10 2 800 VADP = 5.5V 0.6 1.6 STAT Pin Sinks 4mA ICH = 100mA; AAT3681A, AAT3681A-2, and AAT3681A-3 Only AAT3681A, AAT3681A-1, and AAT3681A-2 Only 1. The AAT3681A output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C 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. 4 3681A.2007.10.1.2 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics Charging Current vs. Battery Voltage Constant Charging Current vs. Set Resistor Values (AAT3681A, AAT3681A-2 and AAT3681A-3 only) 600 1000 RSET = 3.24kΩ 100 ICH (mA) ICH (mA) 500 10 RSET = 5.36kΩ 400 300 RSET = 8.06kΩ 200 RSET = 16.2kΩ 100 1 0 1 10 100 1000 RSET = 31.6kΩ 2.7 2.9 3.7 3.9 4.1 Charging Current vs. Battery Voltage End of Charge Battery Voltage vs. Input Voltage 4.3 4.220 RSET = 3.24kΩ 4.215 Battery Voltage (V) 500 400 RSET = 5.36kΩ 300 RSET = 8.06kΩ 200 RSET = 16.2kΩ 100 RSET = 31.6kΩ 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.210 4.205 4.200 4.195 4.190 4.185 4.180 4.5 4.3 5.0 5.5 VBAT (V) Charging Current (mA) 4.21 4.20 4.19 4.18 260 240 220 25 50 Temperature (°C) 3681A.2007.10.1.2 75 100 VBAT = 3.3V 200 180 160 VBAT = 3.6V 140 VBAT = 4.0V 120 0 7.5 280 4.22 -25 7.0 (RSET = 8.06kΩ Ω) 4.23 -50 6.5 Constant Charging Current vs. Input Voltage (RSET = 8.06kΩ Ω) 4.17 6.0 Input Voltage (V) End of Charge Voltage Regulation vs. Temperature VBAT_EOC (V) 3.5 VBAT (V) 600 ICH (mA) 3.3 RSET (kΩ Ω) (AAT3681A-1 only) 0 3.1 4 4.5 5 5.5 6 6.5 7 7.5 Input Voltage (V) 5 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics Constant Charging Current vs. Temperature Operating Supply Current vs. RSET (RSET = 8.06kΩ Ω) (VIN = 5V) 1000 210 VBAT = 3.6V 208 ISUPPLY (µA) ICH (mA) 205 203 200 198 VBAT = 2.85V 100 10 195 193 190 -50 -25 0 25 50 75 1 100 1 10 100 RSET (kΩ Ω) Temperature (°C) Operating Current vs. Temperature Preconditioning Threshold Voltage vs. Temperature (RSET = 8.06kΩ Ω) (RSET = 8.06kΩ Ω; AAT3681A, AAT3681A-2, and AAT3681A-3 Only) 550 3.03 3.02 450 VMIN (V) IOP (µA) 500 400 3.01 3 2.99 350 2.98 300 -50 -25 0 25 50 75 2.97 -50 100 -25 0 Temperature (°C) ITRICKLE (mA) 20.6 20.4 20.2 20.0 19.8 19.6 19.4 0 25 50 Temperature (°C) 6 75 100 Trickle Charge Current (mA) 20.8 -25 75 100 (AAT3681A, AAT3681A-2, and AAT3681A-3 Only) (RSET = 8.06kΩ Ω; AAT3681A, AAT3681A-2, and AAT3681A-3 Only) -50 50 Preconditioning Charge Current vs. Input Voltage Preconditioning Charge Current vs. Temperature 19.2 25 Temperature (°C) 35 RSET = 5.36kΩ 30 25 RSET = 8.06kΩ 20 15 RSET = 16.2kΩ 10 5 0 RSET = 31.6kΩ 4 4.5 5 5.5 6 6.5 7 7.5 Input Voltage (V) 3681A.2007.10.1.2 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics Recharging Threshold Voltage vs. Temperature Shutdown Current vs. Supply Voltage (RSET = 8.06kΩ Ω) (RSET = 8.06kΩ; Ω; AAT3681A, AAT3681A-1 and AAT3681A-2 only) Shutdown Current (nA) 4.18 4.16 VRCH (V) 4.14 4.12 4.10 4.08 4.06 4.04 4.02 1800 -50 -25 0 25 50 75 1600 1400 1000 800 600 400 200 0 4.0 100 4.5 5.0 5.5 6.0 6.5 7.0 Supply Voltage (V) VIH_ENABLE vs. Supply Voltage VIL_ENABLE vs. Supply Voltage 7.5 (RSET = 8.06kΩ Ω) 1.5 1.2 1.4 -40°C 1.1 1.3 -40°C 1.2 VIL_ENABLE (V) VIH_ENABLE (V) -40°C 25°C Temperature (°C) (RSET = 8.06kΩ Ω) 1.1 1.0 0.9 0.8 25°C 0.7 85°C 4.0 4.5 5.0 5.5 6.0 VIN (V) 3681A.2007.10.1.2 1.0 0.9 0.8 0.7 85°C 25°C 0.6 0.5 0.6 0.5 85°C 1200 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) 7 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Functional Block Diagram Reverse Blocking ADP BAT Current Compare Constant Current ISET STAT Charge Status CV/ Precharge Charge Control UVLO OverTemperature Protection GND EN 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 -40°C to +85°C. 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. 8 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.) 3681A.2007.10.1.2 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Preconditioning Trickle Charge Phase Constant Current Charge Phase Constant Voltage Charge 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 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. 3681A.2007.10.1.2 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. 9 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger System Operation Flow Chart Enable No Power On Reset 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) Yes Constant Current Charge Mode No No Recharge Test V RCH > VBAT Yes Current Phase Test V BAT_EOC > VBAT No Yes Voltage Phase Test IBAT > ITERM No (AAT3681A-3) Constant Voltage Charge Mode No (AAT3681A, AAT3681A-1, AAT3681A-2) Charge Completed 10 3681A.2007.10.1.2 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Application Information charge state and measured cell voltage on the BAT pin. 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. 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) Set Resistor Value (kΩ) 500 450 400 350 300 250 200 150 100 50 40 30 20 15 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. Table 1: RSET Values. 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. 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) 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. 1000 100 10 1 1 10 100 1000 RSET (kΩ Ω) 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. 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 Status No battery charging activity Battery charging via adapter or USB port Charging completed1 OFF ON OFF The required ballast resistor values can be estimated using the following formulas: R 1= (VADP - VF(LED)) ILED Example: R1 = (5.5V - 2.0V) = 1.75kΩ 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 160°C/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: 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) = (TJ(MAX) - TA) θJA Where: PD(MAX) = Maximum Power Dissipation (W) θJA = Package Thermal Resistance (°C/W) TJ(MAX) = Maximum Device Junction Temperature (°C) [135°C] 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. 12 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 600 500 450 400 400 200 0 0 20 40 60 80 100 TA (°°C) ICH(MAX) (mA) PD(MAX) (mW) 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. Next, the power dissipation can be calculated by the following equation: PD = [(VIN - VBAT) · ICH + (VIN · IOP)] 250 200 150 50 TA = 85°C 0 4.25 4.5 4.75 TA = 60°C 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 Where: PD TA = 45°C 300 100 Figure 3: Maximum Power Dissipation. TA = 25°C 350 = 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] 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 θJA ICH(MAX) = VIN - VBAT 3681A.2007.10.1.2 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 1µF to 22µF 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 10µF 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 1µF ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10µF 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 10µF may be required to prevent the device from cycling on and off when no battery is present. 13 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger 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). Printed Circuit Board Layout Considerations For the best results, it is recommended to physically place the battery pack as close as possible Figure 5: AAT3681A Evaluation Board Top Layer. Figure 6: AAT3681A Evaluation Board Bottom Layer. VBAT VIN(ADP) JP2 AAT3681A C1 10μF 1 2 3 4 R8 8.06K EN ISET BAT ADP GND GND GND STAT 8 7 6 5 C2 2.2μF U1 (SC70JW-8) JP1 D1 R1 0Ω RED LED 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 1kΩ, 5%, 1/4W; 0603 8.06kΩ, 1%, 1/4W; 0805 0Ω, 5%, 1/4W; 0603 CER 10µF 10V 10% X5R 0805 CER 2.2µF 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 Enable Package Marking1 Part Number (Tape and Reel)2 Yes No Yes Yes Active High Active High Active Low Active Low SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 UTXYY UEXYY VSXYY XBXYY 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. 16 3681A.2007.10.1.2 AAT3681A 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger Package Information SC70JW-8 2.20 ± 0.20 1.75 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 ± 0.075 2.00 ± 0.20 0.100 7° ± 3° 0.45 ± 0.10 4° ± 4° 0.05 ± 0.05 0.15 ± 0.05 1.10 MAX 0.85 ± 0.15 0.048REF 2.10 ± 0.30 All dimensions in millimeters. © 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 17