MIC5157YN

Overview

The MIC5157YN is a Super LDO Regulator Controller manufactured by Microchip Technology, housed in a 14-pin DIP package. It operates within an input voltage range of 3V to 36V and supports an ambient temperature range from -40°C to +85°C. The device features selectable fixed output voltages of 3.3V, 5.0V, or 12V. It includes an internal charge pump tripler for gate drive generation, with a typical operating current of 4.5mA and a shutdown current below 1µA.

Feature Summary

• Internal charge pump tripler generates gate drive voltage without external supplies
• Selectable fixed output configurations for 3.3V, 5.0V, or 12V applications
• TTL-compatible enable pin facilitates low-power shutdown modes
• Integrated open-collector flag output signals out-of-regulation conditions

Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low noise post regulators for switch-mode power supplies
• High-current constant current sources
• Uninterruptible power supply battery switching circuits

Procurement Notes

Verify the component matches the specific 14-pin DIP configuration and the selectable voltage variant. Confirm that the manufacturer designation aligns with the original Micrel specifications now under Microchip Technology. Ensure the operating temperature range meets the required environmental standards for the intended deployment.

Selection Notes

Select this controller when a high-current linear regulator requires an external N-channel MOSFET pass element. The internal charge pump simplifies design compared to controllers requiring external gate drive supplies. Verify that the selected external MOSFET logic level is compatible with the internal tripler output voltage for proper enhancement.

Part Context

This component belongs to the MIC5156/5157/5158 family of Super LDO Regulator Controllers. While the MIC5156 requires an external gate drive supply, the MIC5157 integrates a charge pump tripler. This integration reduces the external component count and simplifies the layout for high-current regulation applications.

Replacement Considerations

MIC5157BM (SOIC-14 version)

FAQ

How is the output voltage configured on the MIC5157?

The output voltage is set by connecting the 3.3V pin to the Source pin for 3.3V output, the 5V pin to the Source pin for 5V output, or leaving both pins open for 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 drops more than 8% below its nominal value, indicating a fault condition.