Maxim MAX8671X功率管理解决方案

        Maxim公司的功率管理集成电路(PMIC)MAX8671X集成了5个可调整输出电压,一个锂离子(Li+)或锂聚合物(Li-Poly)充电器以及有两个电源(AC/DC适配器和USB)输入的智能功率选择器(Smart Power Selector).

        所有充电开关和系统负载切换开关都集成在芯片内,而且不需要外接MOSFET. MAX8671X广泛应用手提媒体播放器和其它手提设备.本文给出了MAX8671X的主要性能特性,方框图以及典型的应用电路.

        概述:

      The MAX8671X integrated power-management IC (PMIC) is ideal for use in portable media players and other handheld devices. In addition to five regulated output voltages, the MAX8671X integrates a 1-cell lithium ion (Li+) or lithium polymer (Li-Poly) charger and Smart Power Selector™ with dual (AC-to-DC adapter and USB) power inputs*. The dual-input Smart Power Selector supports end products with dual or single power connectors. All power switches for charging and switching the system load between battery and external power are included on-chip. No external MOSFETs are
required.

        Maxim’s Smart Power Selector makes the best use of limited USB or AC-to-DC adapter power. Battery charge current and input current limit are independently set. Input power not used by the system charges the battery. Charge current and DC current limit are programmable up to 1A while USB input current can be set to 100mA or 500mA. Automatic input selection switches the system load from battery to external power. Other features include overvoltage protection, charge status
and fault outputs, power-OK monitors, charge timer, and battery thermistor monitor. In addition, on-chip thermal limiting reduces battery charge rate to prevent charger overheating.

        The MAX8671X offers adjustable voltages for all outputs.Similar parts with factory-preset output voltages are also available (contact factory for availability).

        主要特性:
        _ 16V-Tolerant USB and DC Inputs
        _ Automatically Powers from External Power or Battery
        _ Operates with No Battery Present
        _ Single-Cell Li+/Li-Poly Charger
        _ Three 2MHz Step-Down Regulators Up to 96% Efficiency
        _ Two Low IQ Linear Regulators
        _ Output Power-Up Sequencing
        _ Thermal-Overload Protection

        应用:
Portable Audio Players
GPS Portable Navigators

                                               图1. MAX8671X 功能方框图

        图2. MAX8671X 典型应用电路

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