MIC79050-4.2YS

Overview

The MIC79050-4.2YS is a linear single-cell Lithium-Ion battery charger IC manufactured by Microchip Technology. It integrates an on-chip pass transistor to provide high-precision charging for Li-Ion and Lithium-Polymer batteries. The device features ultra-high accuracy of ±0.75% over the standard charging temperature range and maintains zero off-mode current, ensuring minimal power consumption when not in use. Designed for cost-effective applications, it supports a maximum input voltage of 16V and operates within a junction temperature range of -40°C to +125°C. The component is housed in a 4-pin (3+Tab) SOT-223 package.

Feature Summary

• Integrates an on-chip pass transistor for simplified circuit design and high-precision charging control
• Delivers ultra-high voltage accuracy of ±0.75% across the specified lithium-ion charging temperature range
• Achieves zero off-mode current state to minimize standby power consumption in portable devices

Applications

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

Procurement Notes

Verify the specific suffix 'YS' corresponds to the SOT-223 tube packaging configuration. Confirm RoHS compliance status as older variants may differ from current production runs. Ensure the application circuit accounts for the thermal performance of the exposed tab in the SOT-223 package for adequate heat dissipation during continuous charging operations.

Selection Notes

Select this component for designs prioritizing simplicity and low component count over high-efficiency switching regulation. It is suitable for applications where the input-to-output voltage differential is moderate, allowing the linear topology to manage heat effectively. Consider the fixed 4.2V output setting which matches standard single-cell Li-Ion full-charge voltages without requiring external programming resistors.

Part Context

The MIC79050 belongs to Microchip's family of linear battery chargers designed for single-cell applications. It serves as a direct replacement for legacy Micrel MIC79050 parts following the company acquisition. The series offers various package options including SOIC, MSOP, and SOT-223 to accommodate different PCB space constraints and thermal requirements.

Replacement Considerations

MIC79050-4.2YM is available in an 8-pin SOIC-N tube package. MIC79050-4.2YMM is available in an 8-pin MSOP tube package. MIC79050-4.2BMM-TR was previously offered in an 8-pin MSOP tape-and-reel format but is now discontinued.