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FM4258
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 Features:
The input voltage ranges from 3.6V to 5.5V
5V, 2.5A input asynchronous switch boost charging
Trickle/constant current/constant voltage charging
Built-in power MOS
The boost charging efficiency can reach 90%
The charging current is externally adjustable
Input adaptive charging, matching all adapters
650KHz switching frequency, can support 2.2uH inductance
Support LED charging status indication
Output overvoltage, short circuit protection
Input undervoltage, overvoltage protection
OTP overtemperature protection
MPL maximum power limit
5V, 2.5A input asynchronous switch boost charging
Trickle/constant current/constant voltage charging
Built-in power MOS
The boost charging efficiency can reach 90%
The charging current is externally adjustable
Input adaptive charging, matching all adapters
650KHz switching frequency, can support 2.2uH inductance
Support LED charging status indication
Output overvoltage, short circuit protection
Input undervoltage, overvoltage protection
OTP overtemperature protection
MPL maximum power limit
FM4258 Application:
Two-section series lithium battery charging
walkie-talkie
Bluetooth speaker
Electronic cigarette
Power tool
walkie-talkie
Bluetooth speaker
Electronic cigarette
Power tool
FM4258 Package form:
ESOP-8
FM4258 Typical application circuit diagram:
FM4258 Typical application circuit diagram:
FM4258 PCB Layout Layout reference diagram:
FM4258 Pin Definition and description:
FM4258 function block diagram:
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