bq24027 Datasheet | Texas Instruments

.ti. bq24020, bq24022, bq24023 bq24024, bq24025, bq24026 bq24027 SLUS549E - DECEMBER 2002 - REVISED NOVEMBER 2007 SINGLE-CHIP, LI-ION AND LI-POL CHARGER IC WITH AUTONOMOUS USB-PORT AND AC-ADAPTER SUPPLY MANAGEMENT (bq TINY™-II) Features - 2 Small 3 mm × 3 mm MLP Package - Charges and powers Systems from Either AC Adapter or USB With Autonomous power-Source Selection - Integrated USB Control With Selectable 100 m A and 500 m A Charge Rates - Ideal for Low-Dropout Charger Designs for Single-Cell Li-Ion or Li-pol Packs in Space Limited portable applications - Integrated power FET and Current Sensor for Up to 1-A Charge applications From AC Adapter - Precharge Conditioning With Safety Timer - power Good (AC Adapter Present) Status Output - Optional Battery Temperature Monitoring Before and During Charge - Automatic Sleep Mode for Low-power Consumption APPLICATIONS - PDAs, MP3 Players - Digital Cameras - Internet appliances - Smartphones DESCRIPTION The bq TINY-II series are highly-integrated, flexible Li-Ion linear charge and system power management devices for space-limited charger applications. In a single monolithic device, the bq TINY-II offers integrated USB-port and ac-adapter supply management with autonomous power-source selection, power-FET and current-sensor interfaces, high-accuracy current and voltage regulation, charge status, and charge termination. The bq TINY-II automatically selects the USB-port or the ac-adapter as the power source for the system. In the USB configuration, the host can select from two preset charge rates of 100 m A or 500 m A. In the ac-adapter configuration, an external resistor sets the system or charge current. The bq TINY-II charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The bq TINY-II automatically restarts the charge if the battery voltage falls below an internal...