MCP73855-I/MF

Overview

The MCP73855-I/MF is a linear charge management controller designed for USB-compatible Li-Ion and Li-Polymer battery applications. It features an integrated pass transistor and current sense, eliminating external components. The device offers high-accuracy voltage regulation with selectable options of 4.1V or 4.2V and a tolerance of +0.5%. It supports programmable charge currents and includes safety timers, preconditioning for deeply depleted cells, and automatic end-of-charge control. The component operates within a temperature range of -40°C to +85°C and is housed in a 10-lead, 3x3 mm DFN package.

Feature Summary

• Integrates pass transistor and current sense for space-limited designs
• Provides high-accuracy preset voltage regulation with selectable output levels
• Includes reverse blocking protection and thermal regulation capabilities
• Supports USB-compatible charge current settings and safety timers

Applications

• USB-powered portable electronic devices
• Li-Ion single-cell battery charging systems
• Li-Polymer battery management in compact consumer electronics
• Space-constrained cost-sensitive applications

Procurement Notes

Verify the specific suffix indicates the correct operating temperature range and packaging configuration. Confirm that the 10-lead DFN footprint matches the target PCB layout. Ensure compatibility with the intended USB power source specifications. Check for any recent manufacturing changes or obsolescence notices from Microchip Technology before finalizing procurement plans.

Selection Notes

Select this controller when integrating Li-Ion or Li-Polymer batteries into USB-powered devices requiring minimal external component count. It is suitable for applications needing precise voltage regulation without external sensing resistors. Consider the MCP73853 variant if continuous cell temperature monitoring is required, as the MCP73855 omits this feature. Evaluate the 3x3 mm DFN package constraints against available board space.

Part Context

This component belongs to the MCP7385X series of highly advanced linear charge management controllers. The series is optimized for space-limited and cost-sensitive applications, specifically adhering to USB power bus specifications. The MCP73855 differs from the MCP73853 by excluding the cell temperature monitor and one status output, offering a simplified solution in a smaller 10-lead package.

Replacement Considerations

The MCP73853 serves as a functional substitute if temperature monitoring is needed, though it uses a different 16-lead QFN package. Other MCP738xx series devices may offer similar charging profiles but require verification of pinout compatibility and specific feature sets such as fault outputs or temperature sensing.