MIC5158BN

Overview

The MIC5158BN is a Super LDO Regulator Controller manufactured by Microchip Technology, housed in a 14-pin DIP package. It operates within a supply voltage range of 3V to 36V and supports an operating temperature range from -40°C to +85°C. The device provides a fixed 5V output or allows for adjustable output voltages between 1.3V and 36V using external resistors. It features a typical operating current of 4.5mA and includes an internal charge pump tripler for gate drive generation.

Feature Summary

• Internal charge pump tripler generates the necessary gate drive voltage for external N-channel MOSFETs without requiring an external supply.
• Configurable as a fixed 5V controller or programmed for adjustable outputs ranging from 1.3V to 36V via external resistive dividers.
• Integrated constant-current limiting with a typical threshold of 35mV across an external sense resistor.
• Open-collector flag output signals when the regulated voltage drops more than 8% below nominal.

Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low noise or low-dropout SMPS post regulators
• High-current, current-limited high-side switches
• Battery chargers requiring constant-current regulation

Procurement Notes

Verify that the ordering suffix 'BN' corresponds specifically to the 14-pin DIP package variant. Confirm the manufacturer designation on the datasheet matches the intended component source. Ensure the procurement documentation explicitly lists the MIC5158BN part number to avoid confusion with SOIC or other family members.

Selection Notes

Select this component when an integrated gate drive solution is required for high-current linear regulation. The internal charge pump simplifies design compared to controllers needing external gate supplies. Verify that the application requires either a fixed 5V output or an adjustable range up to 36V. Ensure the system can accommodate the necessary external capacitors for the charge pump tripler operation.

Part Context

This component belongs to the MIC5156/5157/5158 Super LDO Regulator Controller family. While the MIC5156 requires an external gate drive supply and the MIC5157 offers selectable fixed voltages (3.3V, 5V, 12V), the MIC5158 specifically provides a fixed 5V option or fully adjustable output capability within the same 14-pin form factor.

Replacement Considerations

MIC5158YN is a direct replacement offering the same functionality in a 14-pin DIP package.

FAQ

How does the MIC5158 generate gate drive voltage?

It utilizes an internal charge pump tripler to create the higher voltage needed to drive the gate of the external N-channel MOSFET pass element.

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 8% or more below its nominal value, indicating an out-of-regulation condition.