MIC5157BN

Overview

The MIC5157BN is a Super LDO Regulator Controller in a 14-pin DIP package. It operates from 3V to 36V with selectable fixed outputs of 3.3V, 5.0V, or 12V. An internal charge pump tripler provides gate drive voltage for an external N-channel MOSFET. The device features a typical operating current of 4.5mA and less than 1µA shutdown current. It includes optional current limiting at a 35mV threshold and an open-collector flag output.

Feature Summary

• Internal charge pump tripler generates gate drive voltage for external N-channel MOSFETs
• Selectable fixed output voltages of 3.3V, 5.0V, or 12V via pin configuration
• TTL-compatible enable control reduces supply current to under 1µA during shutdown
• Open-collector flag output signals when regulation drops below nominal levels

Applications

• Ultrahigh current ultralow dropout voltage regulators
• Low parts count computer power supplies
• High-current current-limited switches
• Uninterruptible power supply battery switching

Procurement Notes

Verify the specific ordering suffix 'BN' corresponds to the standard lead-free 14-pin DIP package variant. Confirm that the selected component matches the industrial temperature range specifications required for your design environment. Ensure compatibility with the intended external MOSFET selection for optimal performance.

Selection Notes

Select this controller when a fixed output voltage is preferred over adjustable configurations. The internal charge pump simplifies design by eliminating the need for an external gate drive supply. Consider the 14-pin DIP package constraints if through-hole mounting is required for the application layout.

Part Context

This component belongs to the MIC5156/5157/5158 family of Super LDO Regulator Controllers. While the MIC5156 requires an external gate drive supply, the MIC5157 integrates a charge pump tripler. This integration allows for simpler designs using logic-level MOSFETs without additional high-voltage generation circuitry.

Replacement Considerations

MIC5157YM-TR (SOIC version)

FAQ

How is the output voltage configured?

Connect the 3.3V pin to the Source pin for 3.3V output, the 5V pin to the Source pin for 5V output, or leave both pins open for 12V output.

What is the function of the FLAG pin?

The FLAG pin is an open-collector output that goes low when the output voltage falls more than 8% below its nominal value.