MIC79050-4.2BS TR

Overview

The MIC79050-4.2BS TR is a single-cell lithium-ion battery charger IC manufactured by Microchip Technology, housed in an SOT-223 package with tape-and-reel delivery. It integrates an on-chip pass transistor to deliver high-precision charging for Li-ion and Li-polymer batteries. The device supports a maximum supply voltage of 16V and operates within a junction temperature range of -40°C to +125°C. It provides fault protection against overcurrent, overtemperature, reverse battery, and reverse current conditions.

Feature Summary

• Integrates an on-chip pass transistor for simplified circuit design
• Provides ultra-high precision charging accuracy across the operating temperature range
• Includes comprehensive fault protection mechanisms for system safety

Applications

• Single-cell lithium-ion battery charging systems
• Lithium-polymer battery management applications
• Portable electronic devices requiring simple charging solutions

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when sourcing. Confirm the manufacturer is Microchip Technology, as Micrel was acquired. Check RoHS compliance status as some variants may differ. Ensure the SOT-223 package matches your PCB footprint requirements before ordering.

Selection Notes

Select this component for applications requiring a minimal external component count due to the integrated pass transistor. It is suitable for designs needing precise charge termination without complex monitoring circuits. Consider the thermal performance of the SOT-223 package relative to the expected charging current and ambient temperature conditions.

Part Context

This part belongs to the MIC79050 family of linear battery chargers designed for single-cell chemistries. It serves as a cost-effective alternative to more complex switching chargers. The device simplifies the charging architecture by combining control logic and power handling in a single small outline package.

Replacement Considerations

Direct substitutes include other MIC79050 variants such as MIC79050-4.2YMM-TR or MIC79050-4.2YM, depending on the required package type (MSOP vs SOIC). Verify pin compatibility and thermal characteristics when cross-referencing with similar single-cell chargers from other manufacturers.