BQ24702 - 多化合物电池充电控制器和系统功率选择器

BQ24702是TI德州仪器公司的一款电池充电器IC产品，BQ24702是多化合物电池充电控制器和系统功率选择器，本站介绍了BQ24702的封装应用图解、特点和优点、功能等，并给出了与BQ24702相关的TI元器件型号供参考。

BQ24702 - 多化合物电池充电控制器和系统功率选择器 - 电池充电器IC - 电池管理产品 - 德州仪器

产品描述

The bq24702/bq24703 is a highly integrated battery charge controller and selector tailored for notebook and sub-notebook PC applications.

The bq24702/bq24703 uses dynamic power management (DPM) to minimize battery charge time by maximizing use of available wall-adapter power. This is achieved by dynamically adjusting the battery charge current based on the total system (adapter) current.

The bq24702/bq24703 uses a fixed frequency, pulse width modulator (PWM) to accurately control battery charge current and voltage. Charge current limits can be programmed from a keyboard controller DAC or by external resistor dividers from the precision 5-V, ±0.6%, externally bypassed voltage reference (VREF), supplied by the bq24702/bq24703.

The battery voltage limit can be programmed by using the internal 1.196-V, ±0.5% precision reference, making it suitable for the critical charging demands of lithium-ion cells. Also, the bq24702/bq24703 provides an option to override the precision reference and drive the error amplifier either directly from an external reference or from a resistor divider off the 5 V supplied by the integrated circuit.

The selector function allows the manual selection of the system power source, battery or wall-adapter power. The bq24702/bq24703 supports battery-conditioning and battery-learn cycles through the ACSEL function. The ACSEL function allows manual selection of the battery or wall power as the main system power. It also provides autonomous switching to the remaining source (battery or ac power) should the selected system power source terminate (refer to Available Options table for the differences between the bq24702 and the bq24703). The bq24702/bq24703 also provides an alarm function to indicate a depleted battery condition.

The bq24702/bq24703 PWM controller is ideally suited for operation in a buck converter for applications when the wall-adapter voltage is greater than the battery voltage.

产品特性

Dynamic Power Management, DPM Minimizes Battery Charge Time
Integrated Selector Supports Battery Conditioning and Smart Battery Learn Cycle
Zero Volt Operation
Selector Feedback Circuit Ensures Break-Before-Make Transition
±0.4% Charge Voltage Accuracy, Suitable for Charging Li-Ion Cells
±4% Charge Current Accuracy
300-kHz Integrated PWM Controller for High-Efficiency Buck Regulation
Depleted Battery Detection and Indication to Protect Battery From Over Discharge
20-µA Sleep Mode Current for Low Battery Drain
24-Pin TSSOP Package and 5 mm × 5 mm QFN package (bq24703 only)

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