MIC5156-3.3YN

Overview

The MIC5156-3.3YN is a Super LDO Regulator Controller manufactured by Microchip Technology, housed in an 8-pin DIP package. It provides a fixed 3.3V output and operates within a supply voltage range of 3V to 36V across an industrial temperature range of -40°C to +85°C. The device requires an external N-channel MOSFET as the pass element and utilizes an external gate drive supply for gate enhancement. Key electrical characteristics 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 high initial accuracy
• Requires external gate drive supply for N-channel MOSFET control
• Integrated open-collector flag output for out-of-regulation detection
• Supports constant-current limiting via external sense resistor

Applications

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

Procurement Notes

Verify that the specific ordering suffix 'YN' corresponds to the 8-pin DIP package variant when sourcing components. Confirm compatibility with external gate drive supply requirements, as this controller does not possess an internal charge pump unlike other family members. Ensure the application design accommodates the necessary external MOSFET and sense resistor for proper operation.

Selection Notes

Select this component when a fixed 3.3V output is required alongside high current capabilities using an external pass transistor. Unlike the MIC5157 or MIC5158, this model relies on an external VP pin for gate drive rather than an internal charge pump. It is suitable for designs where an external higher voltage rail is available to drive the MOSFET gate efficiently.

Part Context

This part 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 series requires an external gate drive supply. The 'Y' suffix indicates standard Pb-Free manufacturing, and 'N' denotes the 8-pin DIP package format.

Replacement Considerations

MIC5156-3.3BN serves as the direct equivalent in the same package family.