MCP73837T-FJI/UN

Overview

The MCP73837T-FJI/UN is a single-cell lithium-ion and lithium-polymer battery charge management controller manufactured by Microchip Technology. It supports USB or DC input with automatic switchover between sources. The device delivers a programmable output current up to 1.2 A and provides a precise 4.2 V charging voltage. It operates within an input supply voltage range of 3.75 V to 6 V. The component is housed in a 10-pin MSOP package and is rated for operation across a temperature range of -40°C to +85°C.

Feature Summary

• Automatic switchover between USB and DC power inputs
• Programmable constant-current and constant-voltage charging profile
• Integrated thermal regulation to manage heat dissipation
• Charge status indicator pin for system monitoring

Applications

• Portable consumer electronics powered by single-cell lithium batteries
• USB-powered devices requiring integrated battery charging
• Mobile communication devices and handheld gadgets
• IoT edge nodes utilizing Li-Ion or Li-Po energy storage

Procurement Notes

Verify the specific suffix FJI against official Microchip documentation to confirm package type, tape-and-reel specifications, and regional compliance status. Ensure the ordering part number matches the required marking code and reel quantity. Cross-reference the datasheet revision date to confirm compatibility with current manufacturing standards and environmental directives before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring automatic source switching between USB and external DC supplies. It is suitable for applications needing a compact solution for single-cell lithium chemistry management. Consider the MSOP-10 footprint constraints and the 1.2 A maximum output current capability relative to the target battery capacity. Evaluate the operating temperature range requirements against the specified -40°C to +85°C limit.

Part Context

This part belongs to the MCP7383x family of charge management controllers from Microchip Technology. It shares functional similarities with models like the MCP73837T-FCI/UN but differs in packaging and marking codes. The series is designed for low-cost, high-performance battery charging in portable applications, offering integrated protection features alongside standard CC/CV charging algorithms.

Replacement Considerations

The MCP73837T-FCI/UN serves as a direct alternative with identical electrical characteristics but utilizes a different package marking code. Verify that the physical footprint and pinout remain compatible with the existing PCB layout before substitution.