MCP73855T-I/MF

Overview

The MCP73855T-I/MF is a USB-compatible linear charge management controller for single-cell lithium-ion and lithium-polymer batteries. It integrates the pass transistor, current sense resistor, and reverse blocking protection within a compact 10-lead, 3x3 mm DFN package. The device provides high-accuracy voltage regulation with selectable options of 4.1V or 4.2V and supports programmable charge currents compatible with USB power specifications. Key operational features include automatic end-of-charge control, preconditioning for deeply depleted cells, and thermal regulation to ensure safe charging under varying conditions.

Feature Summary

• Integrates pass transistor, current sensing, and reverse blocking protection in a small footprint
• Provides high-accuracy constant-voltage and constant-current regulation
• Supports USB-compatible charge current settings and safety timers
• Includes automatic power-down and thermal regulation capabilities

Applications

• Portable consumer electronics powered by USB
• Single-cell lithium-ion battery charging systems
• Lithium-polymer battery management in space-limited devices
• Cost-sensitive applications requiring integrated linear charge control

Procurement Notes

Verify the package suffix against official Microchip documentation. The model indicates an ML package, while the input specifies MF. Confirm that the MF variant matches the required 10-lead DFN form factor and electrical characteristics before procurement to ensure compatibility with the intended PCB layout and design specifications.

Selection Notes

Select this component when a highly integrated solution is required for single-cell Li-Ion or Li-Po batteries. It is suitable for designs constrained by board space due to its small DFN package. Ensure the application requires USB-compatible charging profiles and does not need external temperature monitoring, as this specific model omits the thermistor interface found in other variants.

Part Context

This part belongs to the MCP7385X family of charge management controllers designed specifically for USB applications. It shares core functionality with the MCP73853 but differs in packaging and feature set. While the MCP73853 offers cell temperature monitoring in a QFN package, the MCP73855 utilizes a smaller DFN package and excludes the temperature monitor to reduce component count and size.

Replacement Considerations

The MCP73853 serves as a functional substitute if temperature monitoring is required, though it uses a different QFN package. Direct pin-to-pin replacement with other MCP7385X series parts may require verification of package dimensions and specific feature availability such as status outputs.