MIC5156YN

Overview

The MIC5156YN is a Super LDO Regulator Controller manufactured by Microchip Technology, housed in an 8-pin DIP package. It operates within a supply voltage range of 3V to 36V and supports an adjustable output voltage from 1.3V to 36V using two external resistors. The device features a typical operating current of 4.5mA and a shutdown current below 1µA. It includes an internal 1.235V bandgap reference, an open-collector flag for out-of-regulation detection, and optional constant-current limiting with a 35mV threshold.

Feature Summary

• Requires an external N-channel power MOSFET as the linear pass element
• Includes an active-low open-collector flag indicating low voltage conditions
• Features TTL-compatible enable control for regulator activation or shutdown
• Supports optional constant-current limiting via an external sense resistor

Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low parts count computer power supplies
• High-current, current-limited switches
• Constant high-current sources

Procurement Notes

Verify that the specific part number MIC5156YN corresponds to the adjustable version in the 8-pin DIP package. Confirm the manufacturer origin, as the datasheet references Micrel, Inc., which was acquired by Microchip Technology. Ensure compliance with RoHS standards and check for any specific moisture sensitivity level requirements during storage and handling.

Selection Notes

Select this controller when designing high-current regulation circuits requiring an external MOSFET pass element. It is suitable for applications needing precise output voltage adjustment between 1.3V and 36V. Consider the need for an external gate drive supply, as this model lacks an internal charge pump unlike the MIC5157/8 variants. Evaluate thermal management based on the 100°C/W junction-to-ambient resistance of the DIP package.

Part Context

This component belongs to the MIC5156/5157/5158 family of Super LDO Regulator Controllers. While the MIC5157 and MIC5158 integrate internal charge pumps for gate drive, the MIC5156 requires an external gate drive supply voltage (VP). This distinction makes the MIC5156YN a compact solution for designs where external gate drive generation is acceptable or already present.

Replacement Considerations

MIC5156BN

FAQ

Does the MIC5156YN include an internal charge pump?

No, the MIC5156YN does not have an internal charge pump. It requires an external gate drive supply voltage (VP) to drive the gate of the external N-channel MOSFET.

How is the output voltage configured on the MIC5156YN?

The output voltage is programmable from 1.3V to 36V using two external resistors connected to the Error Amplifier (EA) pin.