MIC79050-4.2BMM TR

Overview

The MIC79050-4.2BMM TR is a linear battery charger IC designed for single-cell Lithium-Ion and Lithium-Polymer batteries, manufactured by Microchip Technology. It features an on-chip pass transistor to deliver high-precision charging with an accuracy of ±0.75% over the Li-Ion battery charging temperature range. The device supports a maximum supply voltage of 16V and operates within a junction temperature range of -40°C to +125°C. It utilizes an 8-pin MSOP package and implements constant current/constant voltage charging profiles. Integrated fault protection mechanisms include overcurrent, overtemperature, battery reverse, and reverse current safeguards.

Feature Summary

• Integrates an on-chip pass transistor for simplified circuit design and high-precision charging control.
• Provides ultra-high charging accuracy of ±0.75% across the specified lithium-ion battery temperature range.
• Features zero off-mode current state to minimize power consumption when not actively charging.
• Includes comprehensive fault protection against overcurrent, overtemperature, battery reverse polarity, and reverse current conditions.

Applications

• Simple single-cell Lithium-Ion battery chargers
• Lithium-Polymer battery management systems
• Portable electronic devices requiring cost-effective charging solutions

Procurement Notes

Verify component status carefully as this specific part number (MIC79050-4.2BMM TR) has been discontinued by DigiKey and may no longer be available from the manufacturer. Confirm end-of-life status directly with Microchip Technology before finalizing designs. Ensure that any substitute components meet the original electrical specifications and pinout requirements to maintain system compatibility and safety standards.

Selection Notes

Select this component for applications requiring a simple, low-component-count solution for single-cell Li-Ion or Li-Po batteries. The integrated pass transistor eliminates the need for external current-sensing resistors, reducing board space and cost. Consider the 8-MSOP package constraints for thermal management and layout. Verify that the input voltage does not exceed the 16V maximum rating and that the operating environment stays within the -40°C to +125°C junction temperature limits.

Part Context

The MIC79050 belongs to Microchip's family of linear battery chargers designed for portable electronics. This series emphasizes simplicity and precision, utilizing internal pass transistors to regulate charging currents and voltages. The MIC79050 specifically targets single-cell applications, offering a compact alternative to more complex switching charger controllers while maintaining high accuracy and built-in safety features for reliable battery management.

Replacement Considerations

The MIC79050-4.2YMM-TR is identified as a direct replacement for the discontinued MIC79050-4.2BMM-TR. Verify pin compatibility and electrical parameters between the BMM and YMM suffixes to ensure seamless integration without redesigning the PCB layout or surrounding circuitry.

FAQ

What is the charging accuracy of the MIC79050?

The MIC79050 offers ultra-high precision with a charging accuracy of ±0.75% over the Li-Ion battery charging temperature range.

Does the MIC79050 require an external pass transistor?

No, the MIC79050 includes an on-chip pass transistor, which simplifies the design by eliminating the need for external discrete transistors.

What fault protections are integrated into the MIC79050?

The device integrates protection against overcurrent, overtemperature, battery reverse polarity, and reverse current conditions.