MCP73834-NVI/UN

Overview

The MCP73834-NVI/UN is a stand-alone linear charge management controller designed for lithium-ion and lithium-polymer batteries. It supports input voltages from 3.75 V to 6 V and delivers an output current of 1.2 A. The device regulates charging voltage at 4.2 V or 4.35 V depending on the specific suffix configuration. It operates within a temperature range of -40°C to +85°C and is housed in a 10-MSOP package.

Feature Summary

• Autonomous source selection between AC adapter and USB port inputs
• Integrated thermal regulation to manage die temperature during high-current charging
• Charge status indicator pin for external LED connection
• Safety timer to terminate charging if battery connection is lost

Applications

• Portable electronic devices requiring Li-Ion/Polymer charging
• USB-powered consumer electronics
• Battery backup systems for embedded applications
• Handheld medical instruments

Procurement Notes

Verify the exact voltage suffix (e.g., UN for 4.2V, UF for 4.35V) as part numbers differ by output specification. Confirm package type matches design requirements. Check RoHS compliance status. Ensure ESD handling procedures are followed due to moisture sensitivity classification. Validate operating temperature range against application environment.

Selection Notes

Select this component for applications requiring autonomous input switching without external logic. Compare with MCP73838 if higher current or different packaging is needed. Ensure input voltage stays within 3.75V to 6V limits. Consider thermal dissipation capabilities when designing PCB layout for continuous 1.2A operation.

Part Context

This IC belongs to Microchip's MCP7383x family of single-cell lithium battery chargers. It shares functional similarities with the MCP73838 but differs in package options and specific electrical characteristics. The family targets cost-sensitive portable applications where space and simplicity are critical design constraints.

Replacement Considerations

MCP73838-NVI/UN offers similar functionality with potential package variations. MCP73834-NVI/MF provides the same electrical performance in a TSSOP package. Verify pin compatibility and voltage settings before substitution.

FAQ

What is the maximum input voltage supported?

The device supports input voltages up to 6 V.

Does it support automatic input source switching?

Yes, it autonomously selects between AC adapter and USB sources.

Is there a safety feature for disconnected batteries?

Yes, it includes a charge safety timer that terminates charging if the battery is removed.