MCP73834T-CNI/UN

Overview

The MCP73834T-CNI/UN is a linear charge management controller designed for single-cell lithium-ion and lithium-polymer batteries. It operates within an input voltage range of 3.75 V to 6 V and supports output voltages of 4.2 V, 4.35 V, 4.4 V, and 4.5 V. The device delivers a maximum output current of 1200 mA. It functions reliably across an operating temperature range from -40°C to +85°C. The component is housed in a DFN package with dimensions of 3 mm by 3 mm and a height of 0.88 mm.

Feature Summary

• Integrates thermal regulation to dynamically reduce charging current based on die temperature
• Includes battery temperature monitoring using external thermistors to ensure safe charging conditions
• Provides status indication through dedicated open-drain flags for charge state and fault detection

Applications

• Single-cell lithium-ion battery charging in portable electronic devices
• Power management systems for mobile communication equipment
• Charging circuits for consumer electronics utilizing Li-Polymer cells

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm the exact output voltage setting, as variations exist within the family. Confirm the package type matches the design requirements, noting that the CNI designation corresponds to the DFN form factor. Ensure compatibility with the intended battery chemistry and system voltage constraints before integration.

Selection Notes

Select this component when precise thermal management and battery temperature monitoring are required for safety compliance. The integrated thermal regulation simplifies heat dissipation design compared to controllers lacking this feature. Verify that the available output voltage options align with the target battery specifications and that the DFN package fits the board layout constraints.

Part Context

This part belongs to the MCP7383x series of charge management controllers from Microchip Technology. The series includes variants such as the MCP73833 and MCP73834, differentiated primarily by their safety features and monitoring capabilities. The MCP73834 specifically adds thermal regulation and battery temperature monitoring compared to earlier models in the lineup.

Replacement Considerations

Public confirmed substitute part numbers: MCP73834T-CNI/MF