原标题：ADI ADP5065兼容USB功率电能快速电池充电管理方案

　　ADI公司的ADP5065是一款内嵌互联直流电压充电输出端与电池端的FET器件，通过FET可以实现电池隔离，当系统驱动电能来自于废电池或没有电池时，系统会立即切换到USB供电模式。ADP5065的输入电压范围为4V至5.5V，最大输入电压高达20V。ADP5065充电器兼容USB2.0、USB3.0和USB电池充电规范1.1。本文通过总结ADP5065器件的特点，分别介绍器件、特性、应用方向及内部结构框图，并给参考设计实例原理图、制板图及元器件清单。

　　The ADP5065 charger is fully compliant with the USB 2.0, USB 3.0, and USB Battery Charging Specification 1.1 and enables charging via the mini USB VBUS pin from a wall charger, car charger, or USB host port.

　　The ADP5065 operates from a 4 V to 5.5 V input voltage range but is tolerant of voltages of up to 20 V. This alleviates the concerns about the USB bus spiking during disconnect or connect scenarios.

　　The ADP5065 also features an internal FET between the dc-to-dc charger output and the battery. This permits battery isolation and, hence, system powering under a dead battery or no battery scenario, which allows for immediate system function on connection to a USB power supply.

　　Based on the type of USB source, which is detected by an external USB detection chip, the ADP5065 can be set to apply the correct current limit for optimal charging and USB compliance.

　　The ADP5065 comes in a very small and low profile 20-lead WLCSP (0.5 mm pitch spacing) package.

　　ADP5065主要特性：

　　3 MHz switch mode charger

　　1.25 A charge current from dedicated charger

　　Up to 680 mA charging current from 500 mA USB host

　　Operating input voltage from 4.0 V up to 5.5 V

　　Tolerant input voltage −0.5 V to +20 V (USB VBUS)

　　Dead battery isolation FET between battery and charger output

　　Battery thermistor input with automatic charger shutdown for when battery temperature exceeds limits

　　Compliant with the JEITA Li-Ion battery charging temperature specification

　　SYS_EN_OK flag to hold off system turn-on until battery is at minimum required level for guaranteed

　　system startup due to minimum battery voltage and/or minimum battery charge level requirements

　　EOC programming with C/20, C/10 and specific current level selection

　　ADP5065应用：

　　Digital still cameras

　　Digital video cameras

　　Single cell Li-Ion portable equipment

　　PDA, audio, GPS devices

　　Mobile phones

　　图1. ADP5065方框图

　　ADP5065设计原理图：

　　图2. ADP5065设计原理图

　　ADP5065设计方案材料清单：