BQ24020

bqTINY-II 单片 1 节锂离子充电器，具有 USB/AC 电源管理、采用 3x3mm2 QFN 封装并具有使能端和温度传感器

The bqNY-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 bqTINY-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 bqTINY-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 mA or 500 mA. In the ac-adapter configuration, an external resistor sets the system or charge current.

The bqTINY-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 bqTINY-II automatically restarts the charge if the battery voltage falls below an internal threshold. The bqTINY-II automatically enters sleep mode when both supplies are removed.

Different versions of the bqTINY-II offer many additional features. These include a temperature-sensor input for detecting hot or cold battery packs, a power-good output PG indicating the presence of input power, a TTL-level charge-enable input CE used to disable or enable the charge process, and a TTL-level timer and taper-detect enable input TTE used to disable or enable the fast-charge timer and charge termination.

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Small 3 mm × 3 mm MLP Package

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Charges and powers Systems from Either AC Adapter or USB With Autonomous power-Source Selection

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Integrated USB Control With Selectable 100 mA and 500 mA Charge Rates

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Ideal for Low-Dropout Charger Designs for Single-Cell Li-Ion or Li-pol Packs in Space Limited portable applications

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Integrated power FET and Current Sensor for Up to 1-A Charge applications From AC Adapter

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Precharge Conditioning With Safety Timer

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power Good AC Adapter Present Status Output

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Optional Battery Temperature Monitoring Before and During Charge

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Automatic Sleep Mode for Low-power Consumption

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APPLICATIONS

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PDAs, MP3 Players

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Digital Cameras

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Internet appliances

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Smartphones

bqTINY is a trademark of Texas Instruments.