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...

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