基于API9221设计的多种输入锂电池充电技术

2012-05-14 11:36:53来源: 互联网
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.

The CHG pin indicates when the termination current is reached, and is reset by EN, power off, or battery below 3.9V. The maximum charge current can be programmed independently via the resistors RIUSB and RIVDC.

The API9221 comes with several protection features. To prevent system damage, the VUSB pin uses over voltage protection (OVP) at 5.4V, and the VDC OVP is at 6.9V. Above these levels, the non-operating device is protected against damage up to 28V. For control and system start-up the API9221 has a current limited linear regulator.

To protect the chip against excessive power dissipation, temperature monitoring is integrated, which folds back the current to a safe level. As the temperature rises, this fold-back begins at 125°C without completely interrupting charging.

API9221主要特性:

• Linear Lithium Ion / Lithium Polymer charging IC

• Supplied from USB host or car/wall adapter

• Overvoltage protection USB: 5.4V, wall: 6.9V

• Supply inputs safe up to 28V

• Fast charging with maximum current of 1.2A

• Integrated linear regulator of 4.9V at 10mA with current limit

• Separate resistor-programmable charging current for wall and USB

• Resistor programmable end-of-charge

• Current limit on USB bypass path

• Indicator pins for charging and power present

• Enable pin to enable host control charging

• Reverse current protection

• Thermal protection

• DFN4030-12: Available in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant

API9221应用:

• Handheld Consumer Devices

• Cell Phones, PDAs, MP3 Players

• Handheld Test Equipment

• Digital Still Cameras

• Multimedia players

图1.API9221功能方框图

图2.API9221应用电路图

关键字:API9221  锂电池  充电

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2012/0514/article_15958.html
本网站转载的所有的文章、图片、音频视频文件等资料的版权归版权所有人所有,本站采用的非本站原创文章及图片等内容无法一一联系确认版权者。如果本网所选内容的文章作者及编辑认为其作品不宜公开自由传播,或不应无偿使用,请及时通过电子邮件或电话通知我们,以迅速采取适当措施,避免给双方造成不必要的经济损失。
论坛活动 E手掌握
微信扫一扫加关注
论坛活动 E手掌握
芯片资讯 锐利解读
微信扫一扫加关注
芯片资讯 锐利解读
推荐阅读
全部
API9221
锂电池
充电

小广播

独家专题更多

富士通铁电随机存储器FRAM主题展馆
富士通铁电随机存储器FRAM主题展馆
馆内包含了 纵览FRAM、独立FRAM存储器专区、FRAM内置LSI专区三大部分内容。 
走,跟Molex一起去看《中国电子消费品趋势》!
走,跟Molex一起去看《中国电子消费品趋势》!
 
带你走进LED王国——Microchip LED应用专题
带你走进LED王国——Microchip LED应用专题
 
电子工程世界版权所有 京ICP证060456号 京ICP备10001474号 电信业务审批[2006]字第258号函 京公海网安备110108001534 Copyright © 2005-2016 EEWORLD.com.cn, Inc. All rights reserved