MCP73834-CNI/UN

Overview

The MCP73834-CNI/UN is a linear charge management controller designed for single-cell lithium-ion and lithium-polymer batteries. It operates within a supply voltage range of 3.75 V to 6 V and provides a regulated output voltage of 4.2 V with an output current capability of 1.2 A. The device features a ±0.75% output voltage tolerance and includes integrated thermal regulation to manage heat dissipation during charging. It supports standard charge termination methods, including automatic recharge functionality when battery voltage drops below the threshold. The component is housed in a 10-pin MSOP package and is rated for operation between -40°C and +85°C.

Feature Summary

• Integrated thermal regulation to reduce charging current based on die temperature
• Automatic recharge function triggered when battery voltage falls below the programmed threshold
• Charge status indicator pin for monitoring charging state
• Supports both constant-current and constant-voltage charging profiles

Applications

• Single-cell lithium-ion battery charging in portable electronics
• Lithium-polymer battery management in consumer devices
• Power management systems requiring thermal protection
• Battery backup units for embedded applications

Procurement Notes

Verify the specific suffix 'CNI' against the manufacturer's official datasheet to confirm pinout compatibility and functional specifications. Ensure the operating environment remains within the specified -40°C to +85°C temperature range. Confirm that the PCB footprint matches the MSOP-10 package dimensions provided in the mechanical drawings. Validate input voltage stability within the 3.75 V to 6 V range to ensure proper controller operation.

Selection Notes

Select this component when designing circuits for single-cell Li-Ion or Li-Po batteries requiring precise voltage regulation and thermal management. Consider the 1.2 A output current limit and 4.2 V fixed output voltage as primary constraints. Evaluate the MSOP-10 package size against available board space. Verify compatibility with external programming resistors if custom charge parameters are required, although default settings often suffice for standard applications.

Part Context

The MCP73834 series belongs to Microchip Technology's family of linear charge management controllers. These components are engineered for high efficiency and reliability in portable device power systems. The CNI/UN variant specifically denotes the commercial temperature grade and tube packaging format. This series integrates essential safety features such as thermal regulation and charge termination logic, making it suitable for cost-sensitive applications where discrete solution complexity must be minimized.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific component configuration are not available in the provided documentation. Users should consult the manufacturer's latest replacement guide or cross-reference tools for verified alternatives.