MIC79050-4.2BS

Overview

The MIC79050-4.2BS is a linear single-cell lithium-ion battery charger IC manufactured by Microchip Technology. It features an on-chip pass transistor and provides a charging termination voltage of 4.2V with a precision of ±0.75% over the operating 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 integrated fault protection mechanisms such as over-current, thermal shutdown, reverse battery, and reverse current protection.

Feature Summary

• Integrates an on-chip pass transistor for high-precision charging without external power switches
• Provides ultra-high charging accuracy of ±0.75% across the specified temperature range
• Features zero off-mode current state to minimize power consumption when disconnected
• Includes comprehensive internal fault protection against over-current, thermal overload, and reverse polarity

Applications

• Single-cell lithium-ion battery charging in mobile phones
• Power management for personal digital assistants (PDAs)
• Charging solutions for handheld electronic devices

Procurement Notes

Verify the specific suffix 'BS' against official Microchip documentation, as standard listings often utilize suffixes like 'YM', 'YS', or 'YMM'. Confirm RoHS compliance status, as some variants may not meet current environmental standards. Ensure the package type matches the required PCB layout, typically SOT-23 or MSOP/SOIC depending on the exact suffix designation.

Selection Notes

Select this component for applications requiring a minimal external component count and high charging accuracy. The integrated pass transistor simplifies design by eliminating the need for external MOSFETs. Consider the thermal performance and package size constraints, as the device relies on internal thermal shutdown protection. Verify that the input voltage source does not exceed the 16V maximum rating.

Part Context

The MIC79050 series represents a family of simple, cost-effective linear chargers designed primarily for single-cell lithium-ion and lithium-polymer batteries. Manufactured originally by Micrel and later acquired by Microchip Technology, these ICs are characterized by their simplicity and high precision. The product line offers various package options to accommodate different space requirements in portable electronics.

Replacement Considerations

MIC79050-4.2YMM-TR