FM4258概述：
FM4258 is a dual lithium-ion battery boost charging management IC with high integration and reliability. The FM4258 charging current can be configured with an external resistor. The charging system integrates three loops: input adaptive loop, constant voltage output loop, and constant current output loop, providing excellent performance for the charging system. The working frequency of the FM4258 boost switch charging converter is 650KHz, and the maximum input charging is 2.5A, with a conversion efficiency of 90%. The input voltage of FM4258 is 5V, with built-in adaptive loop, which can intelligently adjust the charging current and match all adapters.
FM4258 integrates success rate MOS and adopts asynchronous switch architecture, so that it only needs few peripheral devices in application, which can effectively reduce the overall scheme size and BOM cost. FM4258 integrates perfect protection functions: input overvoltage, input undervoltage, output short circuit, output overvoltage and chip over temperature protection.
The FM4258 provides the slim ESOP8 package type for customers to choose, and its rated operating temperature range is - 40 ℃ to 85 ℃.
FM4258是一款兼具高集成度和高可靠性的双节锂电池升压充电管理IC。FM4258充电电流可用外部电阻配置，充电系统集成三个环路:输入自适应环路，恒压输出环路，恒流输出环路，为充电系统提供卓越的性能。FM4258的升压开关充电转换器的工作频率为650KHz最大2.5A输入充电，转换效率为90%。FM4258输入电压为5V，内置自适应环路，可智能调节充电电流，可匹配所有适配器。
FM4258集成功率MOS，采用异步开关架构，使其在应用时仅需极少的外围器件，可有效减少整体方案尺寸，降低BOM成本。FM4258集成了完善的保护功能：输入过压、输入欠压、输出短路、输出过压和芯片过温保护。
FM4258提供了纤小的ESOP8封装类型供客户选择，其额定的工作温度范围为-40℃至85℃。
FM4258特性：
输入电压工作范围 3.6V~5.5V
5V，2.5A 输入异步开关升压充电
涓流/恒流/恒压充电
内置功率 MOS
升压充电效率可达 90%
充电电流外部可调
输入自适应充电，匹配所有适配器
650KHz 开关频率，可支持 2.2uH 电感
支持 LED 充电状态指示
输出过压，短路保护
输入欠压，过压保护
OTP 过温保护
MPL 最大功率限制
FM4258应用：
双节串联锂电池充电
对讲机
蓝牙音响
电子烟
电动工具
FM4258封装形式：
ESOP-8
FM4258典型应用电路图：
FM4258典型应用电路图：
FM4258 PCB Layout布线参考图：
FM4258引脚定义及说明：
FM4258功能框图：
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