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雙節(jié)鋰電池升壓充電管理IC。FM4258充電電流可用外部電阻配置，充電系統(tǒng)集成三個環(huán)路:輸入自適應(yīng)環(huán)路，恒壓輸出環(huán)路，恒流輸出環(huán)路，為充電系統(tǒng)提供卓越的性能。FM4258的升壓開關(guān)充電轉(zhuǎn)換器的工作頻率為650KHz最大2.5A輸入充電，轉(zhuǎn)換效率為90%。FM4258輸入電壓為5V，內(nèi)置自適應(yīng)環(huán)路，可智能調(diào)節(jié)充電電流，可匹配所有適配器。
FM4258集成功率MOS，采用異步開關(guān)架構(gòu)，使其在應(yīng)用時僅需極少的外圍器件，可有效減少整體方案尺寸，降低BOM成本。FM4258集成了完善的保護功能：輸入過壓、輸入欠壓、輸出短路、輸出過壓和芯片過溫保護。
FM4258提供了纖小的ESOP8封裝類型供客戶選擇，其額定的工作溫度范圍為-40℃至85℃。
FM4258特性：
輸入電壓工作范圍 3.6V~5.5V
5V，2.5A 輸入異步開關(guān)升壓充電
涓流/恒流/恒壓充電
內(nèi)置功率 MOS
升壓充電效率可達 90%
充電電流外部可調(diào)
輸入自適應(yīng)充電，匹配所有適配器
650KHz 開關(guān)頻率，可支持 2.2uH 電感
支持 LED 充電狀態(tài)指示
輸出過壓，短路保護
輸入欠壓，過壓保護
OTP 過溫保護
MPL 最大功率限制
FM4258應(yīng)用：
雙節(jié)串聯(lián)鋰電池充電
對講機
藍牙音響
電子煙
電動工具
FM4258封裝形式：
ESOP-8
FM4258典型應(yīng)用電路圖：
FM4258典型應(yīng)用電路圖：
FM4258 PCB Layout布線參考圖：
FM4258引腳定義及說明：
FM4258功能框圖：
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