MCP73843-420I/MS

Overview

The MCP73843-420I/MS is a linear single-cell lithium-ion or lithium-polymer battery charge management controller manufactured by Microchip Technology. It operates within a supply voltage range of 4.5 V to 12 V and delivers a regulated output voltage of 4.2 V with a maximum output current of 10 mA. The device is housed in an 8-pin MSOP package, measuring 3 mm x 3 mm x 0.95 mm. It supports surface mount installation and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates a complete constant-current/constant-voltage linear charging profile for single-cell batteries
• Includes a programmable charge safety timer to terminate charging if the cell fails to reach full charge
• Features a thermal regulation loop that reduces charge current when die temperature reaches a predefined limit

Applications

• Portable electronic devices requiring single-cell Li-Ion or Li-Po power sources
• Battery-powered consumer electronics with limited space constraints
• Low-power embedded systems utilizing small form-factor battery packs

Procurement Notes

Verify component authenticity through authorized Microchip distributors or certified partners. Confirm the specific suffix matches the required package and temperature grade. Request official datasheets and RoHS compliance documentation prior to purchase. Ensure storage conditions adhere to moisture sensitivity level requirements to prevent package damage during assembly.

Selection Notes

Select this component for applications requiring low-cost, single-cell linear charging solutions. The 10 mA output current limits suitability to small-capacity batteries. Verify that the system input voltage remains within the 4.5 V to 12 V operational window. Consider the MSOP-8 footprint compatibility with existing PCB layouts and thermal dissipation capabilities of the target enclosure.

Part Context

This part belongs to the MCP7384x series of charge management controllers designed for portable applications. It provides a simplified interface for integrating battery charging functionality without complex external circuitry. The device complements other Microchip PMIC offerings by addressing basic single-cell charging needs in compact packages.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.