MIC79050-4.2BM-TR

Overview

The MIC79050-4.2BM-TR is a linear single-cell lithium-ion battery charger IC manufactured by Microchip Technology. It features an on-chip pass transistor and provides a fixed 4.2V charge termination voltage with ±0.75% accuracy over the charging temperature range. The device supports input voltages up to 16V and operates within a junction temperature range of -40°C to +125°C. It includes comprehensive fault protection mechanisms such as overcurrent, thermal shutdown, reverse battery, and reverse current protection. The component is supplied in an 8-pin MSOP package.

Feature Summary

• Integrates an on-chip pass transistor for high-precision charging without external switching components
• Provides ultra-high charge termination voltage accuracy of ±0.75% across the operating temperature range
• Features zero off-mode current state to minimize power consumption when not actively charging
• Includes built-in protection against overcurrent, thermal overload, reverse battery polarity, and reverse current

Applications

• Single-cell lithium-ion battery charging in portable consumer electronics
• Power management for mobile communication devices
• Charging solutions for handheld computing devices

Procurement Notes

Verify the specific suffix 'BM' against official Microchip documentation to confirm pinout and electrical characteristics, as suffixes often denote package type or temperature grade variations. Confirm RoHS compliance status, as some variants may be non-compliant. Ensure the supplier source is authorized to guarantee part authenticity and traceability. Check for end-of-life notifications or obsolescence warnings prior to final design commitment.

Selection Notes

Select this component for designs requiring a simple, cost-effective linear charging solution for single-cell lithium-ion batteries. It is suitable for applications where board space is limited due to its small MSOP footprint and minimal external component count. Consider the 16V maximum input voltage rating to ensure compatibility with the system power supply. Evaluate the thermal performance requirements given the linear regulation nature and the specified junction temperature range.

Part Context

The MIC79050 series represents Microchip's entry-level linear battery charger family designed for simplicity and reliability. This specific variant targets single-cell lithium-ion chemistry with a fixed 4.2V output. The MSOP package offers a compact surface-mount solution suitable for space-constrained portable devices. The series emphasizes ease of implementation by integrating the pass transistor and control logic into a single chip.

Replacement Considerations

MIC79050-4.2YMM-TR is identified as a direct substitute for the MIC79050-4.2BMM-TR variant. Verify pin compatibility and electrical specifications between the BM and YMM suffixes before substitution. Consult Microchip's official replacement guide for the most current cross-reference data.