ST STEVAL－ISA076V2 USB兼容锂电池充电解决方案
ST公司的 STEVAL-ISA076V2是基于L6924U的USB兼容的锂电池充电解决方案.L6924U是单片电池充电器,能从USB电源或外接AC适配器对单节锂离子/锂聚合物电池进行充电,支持USB低电压和高电压模式,可编程电流高达1A(AC适配器模式),输出电压4.2V± 1 %,线性或准脉冲工作模式,主要用在PDA,GPS和MP3播放器,USB供电设备,手机,数码相机,无线设备和单独充电器.本文介绍了L6924U主要特性,框图,基本应用电路和演示板STEVAL-ISA076V2主要特性,电路图,材料清单和PCB布局图.
The L6924U is a fully monolithic battery charger that safely charges single-cell Li-Ion/Polymer battery from either an USB power source or an AC adapter. In USB mode, the L6924U supports both low power and high power mode. Alternatively the device can charge from an AC wall adapter. The ideal solution for space-limited portable products integrates the power MOSFET, reverse blocking diode, sense resistor and thermal protection into a compact VFQFPN16 package. When an external voltage regulated adapter or USB port is used, the L6924U works in linear mode, and charges the battery in a constant current constant voltage (CC/CV) profile. Moreover, when a current-limited adapter is used, the device can operate in quasi-pulse mode, dramatically reducing the power dissipation.
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