AAT3687-1

PRODUCT DATASHEET AAT3687 BatteryManagerTM General Description The AAT3687 BatteryManager is a highly integrated single-cell lithium-ion/polymer battery charger IC designed to operate with AC adapter inputs. It requires a minimum number of external components. The AAT3687 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. Adapter charge current rates can be programmed up to 1.5A. An active thermal management system regulates the fast charge constant current for all ambient temperature and input vs. output voltage conditions. Battery 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, thus protecting the charging device, control system, and the battery under charge. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. A serial interface output is available to report 12 various charging status states to a microcontroller. The AAT3687 is available in a Pb-free, thermally-enhanced, space-saving 12-pin TDFN 3x3mm package and is rated over the -40°C to +85°C temperature range. Lithium-Ion/Polymer Battery Charger Features • • • • Input Voltage Range: 4.0V to 5.5V Up to 1.5A Charging Current Adapter Present Indicator (ADPP#) High Level of Integration with Internal: ▪ Charging Device ▪ Reverse Blocking Diode ▪ Current Sensing Active Thermal Loop Charge Reduction Automatic Recharge Sequencing Battery Temperature Monitoring Full Battery Charge Auto Turn-Off / Sleep Mode Over-Voltage, Over-Current, and Over-Temperature Protection Power On Reset and Soft Start Serial Interface Status Report 12-Pin 3x3mm TDFN Package -40°C to +85°C Temperature Range • • • • • • • • • Applications • • • • • • Cellular Telephones Digital Still Cameras Hand Held PCs MP3 Players Personal Data Assistants (PDAs) Other Lithium-Ion/Polymer Battery-Powered Devices Typical Application Adapter Present Enable Serial Interface BATT+ ADPP# EN DATA TS BAT COUT 10µF + BATT- AAT3687 CT Adapter CIN 10µF RSET ADP ADPSET STAT1 GND STAT2 CT 0.1µF TEMP RB1 LED1 RB2 Battery Pack LED2 3687.2008.04.1.12 www.analogictech.com 1 PRODUCT DATASHEET AAT3687 AAT3687 BatteryManagerTM Pin Descriptions Pin # 1 2 3 4 5 6 7 8 9 10 11 12 EP Lithium-Ion/Polymer Battery Charger Name BAT ADP GND EN ADPP# TS DATA STAT2 STAT1 CT N/C ADPSET Type Out In Ground In Out In/Out Out Out Out In/Out Function Battery charging and sensing. Adapter input. Ground connection. AAT3687: Enable pin. Logic high enables the IC. AAT3687-1, AAT3687-2: Enable pin. Logic high enables the IC. EN tied to internal 4MΩ pull-up resistor to ADP. Adapter present indicator. This pin is open drain until ADP pin reaches threshold. Connect to 10kΩ NTC thermistor. Status report to microcontroller via serial interface: open drain. Battery charge status indicator pin to drive an LED: active low, open drain. Battery charge status indicator pin to drive an LED: active low, open drain. Timing capacitor to adjust internal watchdog timer. Set maximum charge time for adapter powered trickle, CC, and CV charge modes. If timing function is not needed, terminate this pin to ground. No connection. Use resistor at this pin to set adapter charging current. Exposed paddle (bottom); connect to GND directly beneath package. In/Out Pin Configuration TDFN33-12 (Top View) BAT ADP GND EN ADPP# TS 1 2 3 4 5 6 12 11 10 9 8 7 ADPSET N/C CT STAT1 STAT2 DATA 2 www.analogictech.com 3687.2008.04.1.12 PRODUCT DATASHEET AAT3687 AAT3687 BatteryManagerTM AAT3687 Feature Options Product AAT3687 AAT3687-1 AAT3687-2 Lithium-Ion/Polymer Battery Charger Trickle Charge Yes Yes No Internal Pull-Up Resistor on EN Pin No Yes Yes Can Leave TS Pin Open No Yes Yes Absolute Maximum Ratings1 Symbol VP VP VN TJ TLEAD Description ADP Input Voltage,