MIC5157YM

Overview

The MIC5157YM is a Super LDO Regulator Controller in a 14-pin SOIC package. It operates from 3V to 36V with a typical operating current of 4.5mA and less than 1µA shutdown current. The device features an internal charge pump tripler for gate drive, selectable fixed outputs of 3.3V, 5.0V, or 12V, and a 35mV current limit threshold. It includes an open-collector flag output for out-of-regulation detection.

Feature Summary

• Internal charge pump voltage tripler eliminates the need for external gate drive supplies
• Selectable fixed output voltages via pin configuration
• Open-collector flag output signals when voltage drops below nominal levels
• TTL-compatible enable control for low-power shutdown

Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low parts count computer power supplies
• High-current current-limited switches
• Uninterruptible power supply battery switching

Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm package type and temperature range. Ensure compatibility with required input voltage ranges and MOSFET gate drive requirements before procurement.

Selection Notes

Select this controller for applications requiring high-current regulation with minimal external components. The internal charge pump simplifies design compared to controllers requiring external gate drive supplies. Verify that the selected fixed output configuration matches the application needs.

Part Context

Part of the MIC5156/5157/5158 family of Super LDO Regulator Controllers designed for high-current linear regulation using external N-channel MOSFETs. The MIC5157 specifically offers selectable fixed outputs without external resistive dividers.

Replacement Considerations

MIC5157YN (DIP package equivalent)

FAQ

How is the output voltage configured on the MIC5157?

The output voltage is selected by connecting the 3.3V or 5V pins to the Source pin. Leaving both pins open results in a 12V output.

What is the function of the FLAG pin?

The FLAG pin is an open-collector output that goes active low when the output voltage falls more than 8% below its nominal value.