Maxim MAX77829高性能3G－4G智能手机电源解决方案

Maxim公司的MAX77829是高性能3G/4G智能手机和平板电脑电源管理IC(PMIC),包括有带反向升压功能的单输入2.0A开关充电器,输入保护高达22V(DC)的适配器,主要用于单颗锂电池, LDO,WLED背景光驱动器.器件还具有双路1.5A闪光LED驱动器(包括火炬模式).主要用在手持设备锂电池电源以及智能手机和平板电脑.本文介绍了MAX77829主要特性,多种功能框图和应用电路,以及MAX77829评估板主要特性,电路图,材料清单和PCB设计图.
The MAX77829 is a high-performance companion PMIC for latest 3G/4G smartphones and tablets. The PMIC includes a single-input 2.0A switched-mode charger with reverse-boost capability and adapter input protection up to 22V (DC) for one-cell Lithium-Ion (Li+) battery, a safeout LDO, and WLED backlight driver supporting up to 25mA/string, 35V output voltage. It also features a dual-channel 1.5A (combined, 750mA/CH) Flash LED driver (with Torch Mode included).
The typical 4MHz switched-mode battery charger with two integrated switches, providing the smallest L/C size, lowest heat and fastest programmable battery-charging current, is ideally suited for portable devices such as headsets and ultra-portable media players. The charger features single input, which works for adapter/USB type inputs. All the MAX77829 blocks connecting to the adapter/USB pin are protected from input overvoltage events. The DC pin is rated to 22V absolute maximum. The USB-OTG output provides true-load disconnect and is protected by an adjustable output current limit (default 900mA, other current limit is also available with different factory setting up to 900mA).
The battery charger drives an external p-channel MOSFET as power-path switch, and its I2C-programmable settings can accommodate a wide range of battery sizes and system loads. When configured in reverse boost mode, the MAX77829 requires no additional inductor to power USB OTG accessories and/or provide illumination to the Flash LED.
The switching charger implements a special CC, CV, and die temperature regulation algorithm; the patented MaxFlash preven...