MIC79050-4.2BM

Overview

The MIC79050-4.2BM is a linear single-cell lithium-ion battery charger manufactured by Microchip Technology, designed for high-precision charging applications. It integrates an on-chip pass transistor to eliminate the need for external current-sensing resistors, thereby simplifying the circuit design and reducing component count. The device supports a maximum input voltage of 16V and operates within a junction temperature range of -40°C to 125°C. It features ultra-high accuracy with a tolerance of ±0.75% over the Li-Ion battery charging temperature range and maintains zero off-mode current when not actively charging.

Feature Summary

• Integrates an on-chip pass transistor for simplified, high-precision charging without external sensing components
• Provides ultra-high charging accuracy of ±0.75% across the full lithium-ion battery temperature range
• Ensures minimal power loss with zero off-mode current state when the charging cycle is complete

Applications

• Simple single-cell lithium-ion battery chargers
• Lithium-polymer battery management systems
• Portable electronic devices requiring compact power management solutions

Procurement Notes

Verify the specific suffix (e.g., YM, YMM) against the required package type such as SOIC-N or MSOP, as these denote physical form factors rather than functional differences. Confirm that the selected variant aligns with the target PCB layout constraints. Ensure compliance with project-specific environmental standards, noting that some variants may not meet RoHS requirements. Cross-reference the manufacturer's latest documentation to confirm current production status and availability before finalizing procurement plans.

Selection Notes

Select this component for designs prioritizing simplicity and precision in single-cell lithium-based battery charging. The integrated pass transistor reduces bill-of-materials complexity compared to controllers requiring external FETs. Consider the operating temperature range and available package options to match thermal and spatial requirements. This IC is suitable for applications where high accuracy is critical but complex fuel gauging or multi-cell management is unnecessary.

Part Context

The MIC79050 belongs to Microchip's family of linear battery management ICs focused on single-cell applications. It serves as a cost-effective alternative to more complex digital chargers, offering reliable performance for standard lithium-ion and lithium-polymer cells. The series is characterized by its ease of implementation and high accuracy, making it a common choice for consumer electronics and industrial portable devices.

Replacement Considerations

MIC79050-4.2YMM-TR is listed as a direct substitute for discontinued variants like the MIC79050-4.2BMM-TR. Verify pinout compatibility and package dimensions before substitution. Check for any updates in manufacturing processes or material compositions that might affect long-term reliability or regulatory compliance.