MIC5156-3.3BM-TR

Overview

The MIC5156-3.3BM-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 power MOSFET as the linear pass element. Key electrical parameters include a typical operating current of 4.5mA and a shutdown current of less than 1µA. It features a 35mV typical current limit threshold and maintains a 1% initial output voltage tolerance.

Feature Summary

• Utilizes an external N-channel power MOSFET as the linear pass element for high-current regulation.
• Includes an active-low open-collector flag output that signals when the output voltage drops more than 8% below nominal.
• Features a TTL-compatible enable pin that activates or shuts down the regulator with minimal standby current consumption.
• Provides internal gate-to-source protective clamping to safeguard the external MOSFET during fault conditions.

Applications

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

Procurement Notes

Verify the specific suffix 'BM' corresponds to the 8-pin SOIC package and industrial temperature range (-40°C to +85°C). Confirm the '-TR' designation indicates tape and reel packaging if required for automated assembly. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability according to manufacturer specifications.

Selection Notes

Select this controller when a fixed 3.3V output is required without external programming resistors. It is suitable for designs where an external gate drive supply is available to power the MOSFET gate. Consider alternative family members like the MIC5157 or MIC5158 if an internal charge pump is preferred over an external gate drive supply.

Part Context

This component belongs to the MIC5156/5157/5158 Super LDO Regulator Controller family. While the MIC5157 and MIC5158 feature internal charge pumps for gate drive, the MIC5156 relies on an external gate drive supply. The family shares common features such as low standby current, current limiting capabilities, and robust protection mechanisms for high-performance linear regulation applications.

Replacement Considerations

MIC5156-3.3BN (DIP package), MIC5156-3.3YM (SOIC package, standard lead-free).