DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger General Description Features The AAT3681 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. • USB or AC Adapter System Power Charger ▪ Programmable from 15mA to 300mA • 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 Pre-Conditioning (AAT3681-1 is No Trickle Charge Option) • Over-Voltage and Emergency Thermal Protection • Power On Reset and Soft Start • LED Status Pin • 8-Pin 2.0 × 2.2mm SC70JW Package The AAT3681 precisely regulates battery charge voltage and current for 4.2V (4.375V option) lithium-ion/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 300mA. 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 AAT3681 is available in a Pb-free, thermally enhanced, space-saving 8-pin 2.0 × 2.2mm SC70JW package and is specified for operation over the -40°C to +85°C temperature range. 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+ BAT ADP C AAT3681 Enable BATTBattery Pack STAT EN ISET GND RSET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 1 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Pin Descriptions Pin # Symbol Type 1 2 3 4 5 6, 7, 8 EN ISET BAT ADP STAT GND In In/Out In/Out Power In Out Power Function Enable pin. Logic high enables the IC (internally pulled down). 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) 2 EN 1 8 GND ISET 2 7 GND BAT 3 6 GND ADP 4 5 STAT Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger AAT3681 Feature Options Product Trickle Charge AAT3681 AAT3681-1 Yes No 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 °C Thermal Information2 Symbol PD JA Description Maximum Power Dissipation Maximum Thermal Resistance Value Units 0.687 160 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 3 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Electrical Characteristics1 VADP = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Operation VADP VUVLO Description Adapter Voltage Range Under-Voltage Lockout (UVLO) UVLO Hysteresis Operating Current IOP Shutdown Current ISHUTDOWN Reverse Leakage Current from BAT Pin ILEAKAGE Voltage Regulation End of Charge Accuracy VBAT_EOC VCH/VCH Output Charge Voltage Tolerance Preconditioning Voltage Threshold VMIN VRCH Battery Recharge Voltage Threshold Current Regulation Charge Current Programmable Range ICH ICH/ICH Charge Current Regulation Tolerance ISET Pin Voltage VSET KI_A Current Set Factor: ICH/ISET Charging Devices Charging Transistor On-Resistance RDS(ON) Logic Control/Protection Input High Threshold VEN(H) VEN(L) Input Low Threshold Output Low Voltage VSTAT STAT Pin Current Sink Capability ISTAT VOVP Over-Voltage Protection Threshold Pre-Charge Current ITK/ICH ITERM/ICH Charge Termination Threshold Current Conditions Rising Edge Min 4.0 3 150 0.5 0.3 0.4 Charge Current = 200mA VBAT = 4.25V, EN = GND VBAT = 4V, ADP Pin Open 4.158 AAT3681 Only Measured from VBAT_EOC Typ 2.85 4.20 0.5 3.0 -0.1 15 Max Units 7.5 4 V 1 1 2 4.242 3.15 0.9 μA V % V 300 mA % V 1.1 0.4 0.4 8 V 10 2 800 VADP = 5.5V mV mA 1.6 STAT Pin Sinks 4mA ICH = 100mA; AAT3681 Only 4.4 10 10 mA V % 1. The AAT3681 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C temperature range is guaranteed by design. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Typical Characteristics Charging Current vs. Battery Voltage Constant Charging Current vs. Set Resistor Values (AAT3681 Only) 350 1000 RSET = 5.36kΩ 250 100 ICH (mA) ICH (mA) 300 10 RSET = 8.06kΩ 200 150 RSET = 16.2kΩ 100 50 1 0 1 10 100 1000 RSET = 31.6kΩ 2.7 2.9 4.3 4.215 RSET = 5.36K RSET = 8.06K RSET = 16.2K 0 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 50 Temperature (°C) 75 100 VBAT = 3.3V 200 180 160 VBAT = 3.6V 140 VBAT = 4.0V 120 25 7.5 280 4.22 0 7.0 (RSET = 8.06kΩ Ω) 4.23 -25 6.5 Constant Charging Current vs. Input Voltage (RSET = 8.06kΩ Ω) -50 6.0 Input Voltage (V) End of Charge Voltage Regulation vs. Temperature VBAT_EOC (V) 4.1 4.220 RSET = 3.24K RSET = 31.6K 4.17 3.9 End of Charge Battery Voltage vs. Input Voltage Battery Voltage (V) ICH (mA) 100 3.7 Charging Current vs. Battery Voltage 400 200 3.5 VBAT (V) 600 300 3.3 RSET (kΩ Ω) (AAT3681-1 Only) 500 3.1 4 4.5 5 5.5 6 6.5 7 7.5 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 5 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Typical Characteristics Constant Charging Current vs. Temperature Operating Supply Current vs. Set Resistor (RSET = 8.06kΩ Ω) 210 1000 208 VBAT = 3.6V 203 IOP (µA) ICH (mA) 205 200 198 VBAT = 2.85V 100 195 193 190 -50 -25 0 25 50 75 10 100 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; AAT3681 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) Trickle Charge Current (mA) ITRICKLE (mA) 20.6 20.4 20.2 20.0 19.8 19.6 19.4 0 25 50 Temperature (°C) 6 100 (AAT3681 Only) 20.8 -25 75 Preconditioning Charge Current vs. Input Voltage (RSET = 8.06kΩ Ω; AAT3681 Only) -50 50 Temperature (°C) Preconditioning Charge Current vs. Temperature 19.2 25 75 100 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 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 7 7.5 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Typical Characteristics Recharging Threshold Voltage vs. Temperature Shutdown Current vs. Supply Voltage (RSET = 8.06kΩ Ω) (RSET = 8.06kΩ Ω) 1800 Shutdown Current (nA) 4.18 4.16 VRCH (V) 4.14 4.12 4.10 4.08 4.06 4.04 4.02 -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) 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) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 7 DATA SHEET AAT3681 USB Port or AC Adapter Li-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 AAT3681 is a high performance battery charger designed to charge single cell lithium-ion/polymer batteries with up to 300mA of current from an external power source. It is a stand-alone charging solution, with just one external component required for complete functionality. The AAT3681 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 300mA for rapid charging applications. The AAT3681 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 overvoltage or over-temperature failure, the device will automatically shut down, protecting the charging device, control system, and the battery under charge. Charging Operation The AAT3681 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). (AAT3681-1 does not have trickle charge.) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Preconditioning Trickle Charge Phase Constant Current Charge Phase Constant Voltage Charge Phase Battery Discharge Constant Voltage Charge Phase Charge Complete Voltage I = Max CC Regulated Current Battery Recharge Voltage Threshold Constant Current Mode Voltage Threshold Trickle Charge and Termination Threshold I = CC / 10 Figure 1: Current vs. Voltage Profile During Charging Phases. Battery Preconditioning Constant Voltage Charging Before the start of charging, the AAT3681 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 AAT3681 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. 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. Constant Current Charging Battery cell preconditioning continues until the voltage on the BAT pin exceeds the preconditioning voltage threshold (VMIN). At this point, the AAT3681 begins the constant current charging phase. The charge constant current (ICH) amplitude is programmed by the user via the RSET resistor. The AAT3681 remains in the constant current charge mode until the battery reaches the voltage regulation point, VBAT_EOC. 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). Consuming very low current in sleep state, the AAT3681 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 AAT3681 input voltage drops, the device will enter sleep state and automatically resume charging once the input supply has recovered from the fault condition. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 9 DATA SHEET AAT3681 USB Port or AC Adapter Li-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 (AAT3681) No (AAT3681-1) Preconditioning Test V MIN > VBAT Yes Preconditioning (Trickle Charge) Yes Constant Current Charge Mode Yes Constant Voltage Charge Mode No No Recharge Test V RCH > VBAT Yes Current Phase Test VBAT_EOC > VBAT No Voltage Phase Test IBAT > ITERM No Charge Completed 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Application Information Nominal ICHARGE (mA) Set Resistor Value (k) 300 250 200 150 100 50 40 30 20 15 5.36 6.49 8.06 10.7 16.2 31.6 38.3 53.6 78.7 105 Adapter or USB Power Input Constant current charge levels up to 300mA may be programmed by the user when powered from a sufficient input power source. The AAT3681 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. Table 1: RSET Values. Adapter Input Charge Inhibit and Resume Enable / Disable The AAT3681 provides an enable function to control the charger IC on and off. The enable (EN) pin is internally pulled down. When pulled to a logic high level, AAT3681 is enabled. When left open or pulled to a logic low level, the AAT3681 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 re-enabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on 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 300mA may be set by selecting the appropriate resistor value from Table 1. 1000 ICH (mA) The AAT3681 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. 100 10 1 1 10 100 1000 RSET (kΩ Ω) Figure 2: Constant Charging Current vs. Set Resistor Values. 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 over-voltage condition occurs, the AAT3681 charge control will shut down the device until voltage on the BAT pin drops below VOVP. The AAT3681 will resume normal charging operation after the over-voltage condition is removed. Over-Temperature Shutdown The AAT3681 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 11 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger The AAT3681 provides battery charge status via a status pin. This pin is internally connected to an N-channel 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 completed 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 lowcost green or red LEDs. It is not recommended to exceed 8mA for driving an individual status LED. ed for a given ambient condition can be estimated by the following discussion. First, the maximum power dissipation for a given situation should be calculated: PD(MAX) = PD(MAX) = Maximum Power Dissipation (W) JA = Package Thermal Resistance (°C/W) TJ(MAX) = Maximum Device Junction Temperature (°C) [135°C] TA = Ambient Temperature (°C) Figure 3 shows the relationship of maximum power dissipation and ambient temperature of AAT3681. 1000 800 The required ballast resistor values can be estimated using the following formulas: 600 400 200 0 (VADP - VF(LED)) R 1= ILED 0 20 40 60 80 100 TA (°°C) Figure 3: Maximum Power Dissipation. Example: R1 = (5.5V - 2.0V) = 1.75kΩ 2mA Next, the power dissipation can be calculated by the following equation: Note: Red LED forward voltage (VF) is typically 2.0V @ 2mA. Thermal Considerations The AAT3681 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 expect- 12 (TJ(MAX) - TA) θJA Where: PD(MAX) (mW) Charge Status Output PD = [(VIN - VBAT) · ICH + (VIN · IOP)] Where: PD VIN VBAT ICH IOP = = = = Total Power Dissipation by the Device Input Voltage Battery Voltage as Seen at the BAT Pin Constant Charge Current Programmed for the Application = 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger ICH(MAX) = Capacitor Selection (PD(MAX) - VIN · IOP) VIN - VBAT Input Capacitor (TJ(MAX) - TA) - V · I IN OP θJA ICH(MAX) = VIN - VBAT 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. 300 TA = 25°C ICH(MAX) (mA) 250 TA = 45°C 200 Output Capacitor 150 100 TA = 85°C TA = 60°C 50 0 4.25 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 AAT3681 adapter input is to be used in a system with an external power supply source, such as a typical AC-toDC 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. 4.5 4.75 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. The AAT3681 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 AAT3681 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. Printed Circuit Board Layout Considerations For the best results, it is recommended to physically place the battery pack as close as possible to the AAT3681 BAT pin. To minimize voltage drops on the PCB, keep the high current carrying traces adequately wide. Refer to the AAT3681 evaluation board for a good layout example (see Figures 5 and 6). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 13 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Figure 5: AAT3681 Evaluation Board Top Layer. Figure 6: AAT3681 Evaluation Board Bottom Layer. VBAT VIN(ADP) JP2 AAT3681 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: AAT3681 Evaluation Board Schematic Diagram. Component Part Number U1 R1 R8 JP1 C1 C2 JP2 LED1 AAT3681IJS-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 10μF 10V 10% X5R 0805 CER 2.2μF 10V 10% X7R 0805 Connecting Header, 2mm Zip Red LED; 1206 Manufacturer Skyworks Vishay Murata Sullins Electronics Chicago Miniature Lamp Table 3: AAT3681 Evaluation Board Bill of Materials. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 DATA SHEET AAT3681 USB Port or AC Adapter Li-Ion/Polymer Battery Charger Ordering Information Trickle Charge Package Marking1 Part Number (Tape and Reel)2 Yes No SC70JW-8 SC70JW-8 REXYY STXYY AAT3681IJS-4.2-T1 AAT3681IJS-4.2-1-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. 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. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. Copyright © 2012, 2013 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. 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Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201882C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 7, 2013 15