DATA SHEET AAT3672 1.6A Dynamic Battery Charger and Power Manager General Description Features The AAT3672 BatteryManager is a highly integrated sin- System Load Power Control from Either ADP or gle-cell (4.2V) lithium-ion/polymer battery charger and Battery system power management IC that enables simultane- ADP Presence Automatically Routes Power from ous battery charging and system load management. Source to Load and Charges Battery Automatic Charge Reduction Loop to Minimize The AAT3672 provides charging current and system Charge Time power management from a single input that may be sup- Digitally Controlled Thermal Protection plied by an AC adapter or USB port power source. This Battery Power Enable device allows the user to program the battery charge Programmable Battery Charge Timer current up to 1.6A depending on the current shared with Battery Cell Temperature Sensing the system output. A battery charge timeout timer is Charge Status Reporting (LEDs) provided for charging safety and the charge termination Automatic Recharge Sequencing current is also user-programmable. Battery Over-Voltage, Over-Current, and The AAT3672 employs a battery charge current reduc- Over-Temperature Protection tion function that enables continued system operation in System Load Current Limiting the event the input source can not supply the required 14-pin 3 3mm TDFN Package load current. When operated under excessive thermal conditions, the AAT3672 has a digitally controlled ther- Applications mal loop which allows the maximum possible charging current for any given ambient temperature condition. Cellular Phones Digital Still Cameras Battery temperature, voltage and charge state are mon- Digital Video Cameras itored for fault conditions. The AAT3672-1/-2 has two Global Positioning Systems (GPS) status monitor output pins (STAT1 and STAT2), and the MP3 Players AAT3672-3 has one status monitor output (STAT1) pro- Handheld PCs vided to indicate battery charge status by directly driving external LEDs. The AAT3672 is available in a Pb-free, thermally enhanced, space-saving 14-pin 3 3mm TDFN package. Typical Application System Load System Load OUT STAT1 OUT STAT1 Adapter Input BAT+ BAT+ ADP STAT2 BAT BAT CADP Adapter Input 10F CBAT C ADP BAT ADP ADP AAT3672-3 10F 10F CADP Enable 1 10F EN1 AAT3672-1/-2 10k Enable 2 10k Enable EN2 EN Temp Temp Enable Input to Output Enable Input to Output TS TS ENO ENO Battery Battery Enable Battery to Output CHR Threshold Enable Battery to Output CHR Threshold Pack Pack ENBAT CHRADP ENBAT CHRADP ADPSET ADPSET CT CT TERM TERM GND GND C R R CT T SET TERM RSET RTERM Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 201880B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. April 25, 2012 DATA SHEET AAT3672 1.6A Dynamic Battery Charger and Power Manager Pin Descriptions Pin Name Type Function Connect a resistor from this pin to GND set the ADP fast charge constant current. The programmed 1 ADPSET I constant current level should be less than the ADP current limit set by ADPLIM speci cation (I ). LIM ADP Adapter input, source of system load and battery charging. Connect a 1F (minimum) ceramic ca- 2 ADP I pacitor as close as possible between ADP and GND. This open-drain MOSFET device is for charger status reporting. If used for status indication display, 3 STAT1 O connect an LED Cathode to this node with a series ballast resistor. Connect the LED anode to OUT or ADP. 4 GND I/O Common ground connection. AAT3672-1/-2: This open-drain MOSFET device is for charger status reporting. If used for status STAT2 O indication display, connect an LED cathode to this node with a series ballast resistor. Connect the LED anode to OUT or ADP. 5 AAT3672-3: The EN2 pin (internal pull-down) is used together with the EN1 pin see Table 2 in the EN2 IFunctional Descriptio section of this datasheet. AAT3672-1/-2: Input enable (internal pull-down). High to enable the ADP switch and battery charg- EN I ing path low or oating to disable the ADP switch and battery charging function. See Table 1 in the Functional Descriptio section of this datasheet. 6 AAT3672-3: This EN1 pin (internal pull-down) is used together with the EN2 pin see Table 2 in the EN1 IFunctional Descriptio section of this datasheet. Enable Input power to OUT, the dynamic power path from the ADP input to the system load. Active 7 ENO I high input (internal pull down). Battery load switch enable, active high. Battery load switch control the power path between the bat- 8 ENBAT I tery cell and OUT (internal pull down). Adaptor mode charge reduction voltage threshold programming pin. The ADP charge reduction 9 CHRADP I threshold may be adjusted from the default value by placing a voltage divider between this pin to VADP and GND to this pin. Connect a resistor between this pin and GND to program the charge termination current threshold. 10 TERM I The charge termination current level can be disabled by connecting this pin to a logic high level. Battery temperature sensing input. For typical applications, connect a 10k resistor from ADP to this pin and a 10k NTC thermistor located inside the battery pack under charge to this pin and GND to 11 TS I sense battery over temperature conditions during the charge cycle. To disable the TS function, con- nect with a 10k resistor between this pin and GND. Battery pack (+) connection. For best operation, a 1F (minimum) ceramic capacitor should be 12 BAT I/O placed as close as possible between BAT and GND. System dynamic power output supplied from the ADP input, BAT or both. Connect a 10F capacitor 13 OUT O between this pin and GND for best system stability. If the system load circuit contains a reasonable bulk capacitance, the output capacitor value may be reduced. Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typi- 14 CT I cally, a 0.1F ceramic capacitor is connected between this pin and GND. To disable the timer circuit function, connect this pin directly to GND. EP EP I/O Exposed paddle (package bottom). Connect to GND as closely to the device as possible. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 201880B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. April 25, 2012