原标题：Maxim MAX8862手提设备高效电源管理方案

　　Maxim公司的 MAX8662/MAX8663是手提设备用的高效电源管理IC(PMIC)，集成了两个同步降压稳压器(效率达95%)，可驱动2-7个白光LED的1MHz升压稳压器，4个LDO以及用于单节锂电池的线性充电器，输入电压1.7V-5.5V，适配器或USB输入，主要用在智能手机，PDA，MP3和PMP以及无线手持设备等。本文介绍了MAX8662/MAX8663主要特性，方框图和应用电路和MAX8662评估板主要特性，电路图与材料清单。

　　The MAX8662/MAX8663 power-management ICs (PMICs) are efficient, compact devices suitable for smart cellular phones, PDAs, Internet appliances, and other portable devices. They integrate two synchronous buck regulators, a boost regulator driving two to seven white LEDs, four low-dropout linear regulators (LDOs), and a linear charger for a single-cell Li-ion (Li+) battery.

　　Maxim’s Smart Power Selector™ (SPS) safely distributes power between an external power source (AC adapter, auto adapter, or USB source), battery, and the system load. When system load peaks exceed the external source capability, the battery supplies supplemental current. When system load requirements are small, residual power from the external power source charges the battery. A thermal-limiting circuit limits battery-charge rate and external power-source current to prevent overheating. The PMIC also allows the system to operate with no battery or a discharged battery.

　　The MAX8662 is available in a 6mm x 6mm, 48-pin TQFN package, while the MAX8663, without the LED driver, is available in a 5mm x 5mm, 40-pin TQFN package.

　　MAX8662/MAX8663主要特性：

　　Two 95%-Efficient 1MHz Buck Regulators

　　Main Regulator: 0.98V to VIN at 1200mA

　　Core Regulator: 0.98V to VIN at 900mA

　　1MHz Boost WLED Driver

　　Drives Up to 7 White LEDs at 30mA (max)

　　PWM and Analog Dimming Control

　　Four Low-Dropout Linear Regulators

　　1.7V to 5.5V Input Range

　　15μA Quiescent Current

　　Single-Cell Li+ Charger

　　Adapter or USB Input

　　Thermal-Overload Protection

　　Smart Power Selector (SPS)

　　AC Adapter/USB or Battery Source

　　Charger-Current and System-Load Sharing

　　MAX8662/MAX8663应用:

　　Smart Phones and PDAs

　　MP3 and Portable Media Players

　　Palmtop and Wireless Handhelds

　　图1。MAX8662/MAX8663方框图和应用电路

　　MAX8662评估板

　　The MAX8662 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that evaluates the MAX8662 power-management IC. The MAX8662 integrates two synchronous rectified step-down regulators, a step-up regulator driving two to seven white LEDs (WLEDs), four low-dropout linear regulators (LDOs), and a linear charger for a single-cell Li-ion (Li+) battery. Maxim’s Smart Power Selector™ (SPS) safely distributes power between an external power source (AC adapter, auto adapter, or USB source), battery, and the system load.

　　MAX8662评估板主要特性：

　　Two 95%-Efficient 1MHz Synchronous Rectified Step-Down Regulators

　　One 1MHz Step-Up WLED Driver

　　Four LDO Regulators with Jumper-Selectable Output Voltages

　　Single-Cell Li+ Charger

　　Smart Power Selector (SPS)

　　Power-OK, Charger Status, and Timeout Fault Indicators

　　LED Analog Brightness and PWM Dimming Control

　　48-Pin, 6mm x 6mm x 0.8mm Thin QFN IC Package

　　Fully Assembled and Tested

　　MAX8662评估板应用:

　　3G Smart cellular phones

　　Other Handheld Devices

　　PDAs, portable media players (PMPs)

　　Portable GPS Navigation Devices (PNDs)

　　图2。MAX8662评估板电路图

　　MAX8662评估板所用材料清单：