MIC5156BM-TR

Overview

The MIC5156BM-TR 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 below 1µA. It provides fixed output voltages of 3.3V or 5.0V with a typical initial tolerance of 1%. An optional external sense resistor enables constant-current limiting at a threshold of 35mV.

Feature Summary

• Integrates error amplifier and bias circuitry for high-current low-dropout linear regulation using an external N-channel MOSFET pass element.
• Includes an open-collector flag output that signals when the regulated output drops more than 8% below nominal voltage.
• Features TTL-compatible enable control to activate or shut down the regulator, reducing supply current during standby.
• Provides internal gate-to-source protective clamping to safeguard the external power MOSFET against overvoltage conditions.

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

Procurement Notes

Verify the specific suffix 'BM' corresponds to the 8-pin SOIC package and the '-TR' indicates tape-and-reel packaging. Confirm the manufacturer designation as Microchip Technology, noting the component's historical origin from Micrel. Ensure the fixed output voltage variant matches the design requirement, as the base MIC5156 model also exists in adjustable configurations.

Selection Notes

Select this controller when designing a high-efficiency linear regulator requiring minimal external components. It is suitable for applications needing precise voltage regulation with low quiescent current. Consider the need for an external N-channel MOSFET and ensure the chosen MOSFET logic level matches the available gate drive voltage provided by the controller.

Part Context

This component belongs to the MIC5156/5157/5158 family of Super LDO Regulator Controllers. While the MIC5157 and MIC5158 include internal charge pumps for gate drive, the MIC5156 requires an external gate drive supply voltage. All variants share similar protection features and are designed to work with external power MOSFETs to achieve high current capabilities.

Replacement Considerations

Direct replacements include MIC5156YM-TR and MIC5156-3.3YM-TR. Verify pin compatibility and package dimensions before substitution.