MIC5156-3.3YM-TR

Overview

The MIC5156-3.3YM-TR is a Super LDO Regulator Controller manufactured by Microchip Technology, housed in an 8-pin SOIC package. It provides a fixed 3.3V output and operates within a supply voltage range of 3V to 36V. The device requires an external N-channel MOSFET as the pass element and utilizes an external gate drive supply for enhancement. Key electrical parameters include a typical operating current of 4.5mA, a shutdown current below 1µA, and a current limit threshold of 35mV.

Feature Summary

• Fixed 3.3V output configuration with 1% initial tolerance
• Requires external gate drive supply for MOSFET control
• Integrated open-collector flag for out-of-regulation detection
• Optional constant-current limiting via external sense resistor

Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low parts count 5.0V to 3.3V computer supplies
• Constant high-current sources
• High-current, current-limited switches

Procurement Notes

Verify that the specific ordering suffix corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm the component meets RoHS3 compliance standards and ensure the selected variant matches the necessary temperature rating for the intended operational environment.

Selection Notes

Select this controller when a fixed 3.3V output is required without external programming resistors. Designers must provide an external gate drive supply voltage, which distinguishes it from variants featuring internal charge pumps. Ensure the external MOSFET selection supports the required logic-level gate drive characteristics for optimal performance.

Part Context

This component belongs to the MIC5156/5157/5158 family of Super LDO Regulator Controllers. While the MIC5157 and MIC5158 integrate internal charge pumps for gate drive generation, the MIC5156 relies on an external VP pin for this function. This architecture allows for flexible gate drive voltage management tailored to specific power stage requirements.

Replacement Considerations

MIC5156-3.3BM

FAQ

How does the MIC5156-3.3 handle gate drive voltage?

Unlike other family members, the MIC5156-3.3 requires an external gate drive supply connected to the VP pin to enhance the external N-channel MOSFET.

What is the purpose 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, signaling a fault condition.