Diode API9221多种输入锂电池充电方案
Diode公司的API9221是可采用汽车/墙适配器或USB电源的多种输入锂电池充电器,器件包括OVP USB旁路和4.9V/10mA LDO.USB过压保护5.4V, 墙适配器过压保护6.9V,安全电源输入高达28V,最大快速充电电流1.2A,单独的电阻可编程充电电流和充电终止,反向电流保护和热保护.主要用在手持消费类电子,手机,PDA,MP3播放器,手持测试设备,数码相机和多媒体播放器.本文介绍API9221主要特性, 功能方框图和应用电路图.
API9221: Car/Wall or USB Supply Input Lithium Battery Charger with OVP USB Bypass and 10mA LDO
The API9221 has two supply inputs for highly integrated portable applications, enabling charging from a USB host, wall adapter, or car adapter.
The PPR pin indicates to a host controller that a safe and valid supply is connected to either VUSB or VDC. The higher charge current option from VDC will take priority if both supplies are connected. The host controller can control the state of charging via the enable pin EN. The API9221 implements the constant current/constant voltage (CC/CV) charge algorithm for Lithium based battery cells. The connected cell will be charged to 4.2V with an accuracy of 1% over the entire temperature range. The termination current is programmable via an external resistor, RIMIN.
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