MIC5156YM

Voltage Regulators - Linear Regulator Controllers Overview

The MIC5156YM is a Super LDO Regulator Controller manufactured by Microchip Technology, housed in an 8-pin SOIC package. It operates within a supply voltage range of 3V to 36V and supports an ambient temperature range from -40°C to +85°C. The device features a typical operating current of 4.5mA and a shutdown current of less than 1µA. It provides fixed output voltages of 3.3V or 5.0V, with an adjustable version available. Key electrical parameters include a current limit threshold of 35mV and a flag comparator threshold at 92% of nominal output.

Voltage Regulators - Linear Regulator Controllers Feature Summary

• Integrates error amplifier and bias circuitry for high-current low-dropout linear regulation using external N-channel MOSFETs
• Includes open-collector FLAG output that activates when output voltage drops more than 8% below nominal levels
• Features TTL-compatible enable pin for regulator activation or shutdown control
• Incorporates internal gate-to-source protective clamp to safeguard external MOSFETs during fault conditions

Voltage Regulators - Linear Regulator Controllers Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low parts count computer power supplies (e.g., 5.0V to 3.3V conversion)
• Low noise post-regulators for switch-mode power supplies
• High-current, current-limited switches

Voltage Regulators - Linear Regulator Controllers Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and output configuration. Ensure compatibility with required input voltage ranges and thermal management strategies for the 8-SOIC footprint. Confirm RoHS compliance status through manufacturer datasheets prior to integration into final designs.

Voltage Regulators - Linear Regulator Controllers Selection Notes

Select this controller when designing high-current linear regulators requiring minimal external component count. It is suitable for applications needing precise output voltage monitoring via the FLAG pin. Consider the need for an external gate drive supply versus models with integrated charge pumps based on input voltage constraints.

Voltage Regulators - Linear Regulator Controllers Part Context

This component belongs to the MIC5156/5157/5158 family of Super LDO Regulator Controllers. While the MIC5157 and MIC5158 feature internal charge pumps for gate drive, the MIC5156 requires an external gate drive supply voltage. All variants share similar control logic and protection features but differ in pin counts and internal voltage generation capabilities.

Voltage Regulators - Linear Regulator Controllers Replacement Considerations

MIC5156-3.3BM

Voltage Regulators - Linear Regulator Controllers FAQ

How does the MIC5156YM handle current limiting?

It uses an external sense resistor between VDD and the Drain pin. When the voltage drop across this resistor reaches 35mV, the internal comparator reduces the error amplifier output to maintain constant current.

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, signaling a fault condition.