原标题：Maxim MAX77829智能手机和平板电脑电源解决方案

　　Maxim公司的MAX77829是3G/4G智能手机和平板电脑的高性能电源解决方案,包括单输入2.0A开关充电器,输入保护高达22V(DC)的适配器,安全的LDO和输出电压35V的WLED背光驱动器,以及双路1.5A闪光LED驱动器(带火炬模式),开关频率4MHz,主要用在智能手机和平板电脑以及其它锂电池供电手持设备.本文介绍了MAX77829优势和特性,框图,主电池充电器应用电图,以及评估板MAX77829 EV优势和特性,电路图和材料清单,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 prevents overloading a weak battery, further extending battery life.

　　The MAX77829 features an I2C 2.0-compatible serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL).

　　MAX77829优势和特性:

　　Highly Integrated SolutionSingle Input Switched Mode Charger

　　Camera Flash and Torch LED Driver, Dual-Channel 750mA/ch

　　Two-String White LED Backlight Driver, 25mA/ch, 35V OVP

　　One Safeout LDO

　　Single High Efficient Switched Mode ChargerSupporting Up to 2.0A Charging Current Capability

　　Input-Voltage-Based Automatic Input Current Limit (AICL) Power Management

　　System Voltage Regulator/Battery Charger with External Power Path

　　Various Charging Protection Features

　　Single Input Accommodating Standard USB and High Input Voltage Adaptor22V Absolute Maximum Input Voltage Rating,

　　up to +9.4V Maximum Operating Input Voltage

　　USB OTG CapabilityReverse Boost Support, Up to 900mA at +5V

　　Programmable Reverse Boost Output Voltage(Up to 5.8V)

　　Flexible ProgrammabilityI2C 2.0 Serial Interface

　　Compact Package3.64mm x 3.24mm WLP, 8 x 7 Array, 56-Bumps, 0.4mm Pitch

　　MAX77829应用:

　　Smartphone and Tablets

　　Other Li-Ion Battery Power Handheld Devices

　　图1.MAX77829框图

　　图2.MAX77829主电池充电器应用电图

　　图3.MAX77829 WLED升压转换器和电流源功能框图

　　图4.MAX77829应用电路图

　　评估板MAX77829 EV

　　The MAX77829 is a high-performance companion PMICfor the latest 3G/4G smartphones and tablets. The PMICincludes a single input 2.0A switched-mode charger withreverse boost capability and adapter input protection upto 22V (DC) for one-cell lithium ion (Li+) battery, a safeoutLDO, and WLED backlight driver supporting up to 25mA/string, 35V output voltage. It also features a dual-channel1.5A (combined, 750mA/ch) flash LED driver (with torchmode included).

　　The MAX77829 evaluation kit (EV kit) is a fully assembledand tested printed circuit board that demonstrates thefunctionality and performance of MAX77829. The EVkit allows for easy evaluation of each block and feature.

　　In the package, one set of MINIQUSB from Maxim(serves as an I2C to USB interface) is provided with theMAX77829 EV kit for easy testing.

　　Windows®-based software provides a user-friendly interfaceto exercise the features of the MAX77829. This softwareoffers a graphical user interface (GUI) as well as aregister-based interface.

　　评估板MAX77829 EV优势和特性:

　　●● EV Kit Includes All the Necessary Components forDevice Operation in Addition to Many Componentsfor Added Flexibility and Ease of Use

　　●● Easy-to-Use Pushbutton Interface for On/Off Control

　　●● Assembled and Tested

　　●● Test Points Allowing Convenient Access to Nodes ofInterest

　　●● Lead-Free and RoHS Compliant

　　●● Jumper Headers Acting as Both Test Points andShunts

　　图5.评估板MAX77829 EV外形图

　　评估板MAX77829 EV材料清单: