MIC5156BM

Overview

The MIC5156BM is a Super LDO Regulator Controller manufactured by Microchip Technology, designed for high-current linear voltage regulation. It utilizes an external N-channel power MOSFET as the pass element, achieving dropout voltages determined by the MOSFET's on-resistance. The device features a typical operating current of 4.5mA and standby current below 1µA. It offers fixed output voltages of 3.3V or 5.0V with 1% initial tolerance. Key specifications include a 35mV typical current limit threshold, internal gate-to-source protection, and an enable pin for shutdown control.

Feature Summary

• Utilizes an external N-channel power MOSFET to achieve ultralow dropout voltage proportional to the transistor's on-resistance.
• Provides fixed output voltage configurations with 1% initial tolerance and 2% temperature stability.
• Includes an internal charge pump-free architecture with an enable pin for active shutdown management.
• Features integrated gate-to-source protective clamping and optional current limiting capabilities.

Applications

• Ultrahigh current ultralow dropout voltage regulator circuits
• Constant high-current source implementations
• Low parts count 5.0V to 3.3V computer supply conversions
• Low noise post-regulation for switching power supplies

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm package type and thermal rating. Ensure the external MOSFET selection matches the required current and voltage ratings. Confirm RoHS compliance status through the manufacturer's latest environmental declaration. Validate that the fixed output variant aligns with the target system voltage requirements before procurement.

Selection Notes

Select this controller when minimizing component count and dropout voltage are critical. It requires an external N-channel MOSFET sized for the load current. Verify that the input voltage range supports the desired output level. Consider the 4.5mA quiescent current for battery life calculations. Ensure the PCB layout accommodates the external pass element and sense connections properly.

Part Context

This component belongs to the MIC5156/7/8 family of Super LDO Regulator Controllers. The MIC5156 specifically provides fixed 3.3V or 5.0V outputs, distinguishing it from the programmable MIC5158. It serves as a core control IC for high-efficiency linear regulation systems requiring low noise and high current capability without complex feedback networks.

Replacement Considerations

Direct substitutes within the same family include MIC5156-3.3YM and MIC5156-5.0YM for SOIC packages. For DIP packages, MIC5156YN variants may be considered. Verify pin compatibility and thermal performance when cross-referencing with other manufacturers' high-side P-MOS controllers.