MIC5159BM6-TR

Overview

The MIC5159BM6-TR is a precision-voltage regulator controller from Microchip Technology, packaged in an SOT-23-6. It operates with an input voltage range of 1.65V to 5.5V and provides a fixed output voltage of 1.8V. The device features ±1.0% initial output tolerance at 25°C and is designed for use with external P-Channel MOSFETs to form low-dropout regulators capable of driving high currents up to 10A. It includes logic-controlled shutdown and programmable current limit protection.

Feature Summary

• Logic-controlled enable input for active-high ON/OFF control
• Programmable current limit via external sense resistor
• Stable operation with ceramic output capacitors
• Fast transient response characteristics

Applications

• Ultra-high current, ultra-low dropout voltage regulators
• Low-voltage distributed power systems
• Fixed telecom power supplies
• Multimedia and PC power supplies
• Battery chargers

Procurement Notes

Verify the specific suffix BM6 corresponds to the SOT-23-6 package and 1.8V fixed output configuration as documented in the ordering information. Confirm that the component is sourced from authorized distributors to ensure authenticity, as the datasheet indicates Micrel Inc. as the original manufacturer before acquisition by Microchip Technology. Check for any recent Product Change Notifications regarding packaging or assembly changes.

Selection Notes

Select this controller when designing a two-chip LDO using an external P-Channel MOSFET. Ensure the external MOSFET meets the required gate threshold and breakdown voltage specifications for the target input voltage. Calculate the current sense resistor value based on the desired maximum output current using the 50mV threshold specified in the electrical characteristics. Verify thermal dissipation requirements for the MOSFET, as the controller lacks internal thermal protection.

Part Context

The MIC5159 series consists of precision-voltage regulator controllers available in adjustable and fixed output versions. The MIC5159BM6-TR specifically denotes the 1.8V fixed output variant in the SOT-23-6 package. Other variants include the MIC5159YM6 (adjustable) and MIC5159-3.0BM6 (3.0V fixed). The 'TR' suffix typically indicates tape and reel packaging, though the provided source text lists it alongside other suffixes without explicit packaging definition beyond the standard part number structure.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.