MIC5159-1.8BM6-TR

Overview

The MIC5159-1.8BM6-TR is a precision-voltage regulator controller from Microchip Technology, packaged in an SOT-23-6 housing. 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 via the enable pin and offers programmable current limit protection.

Feature Summary

• Logic-controlled shutdown capability via active-high enable pin
• Programmable current limit protection using an external sense resistor
• Stable operation with ceramic output capacitors due to µCap design
• Fast transient response characteristics

Applications

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

Procurement Notes

Verify that the component matches the specific fixed 1.8V output variant, as the MIC5159 family also includes adjustable versions. Confirm the SOT-23-6 package type and ensure the supplier documentation references the correct Micrel/Microchip datasheet for electrical specifications. Check for RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this controller when designing a linear regulator requiring a fixed 1.8V output from inputs between 1.65V and 5.5V. It is suitable for applications needing high efficiency and fast transient response. Ensure the external P-Channel MOSFET selection accounts for thermal dissipation and gate threshold requirements relative to the minimum input voltage.

Part Context

This component belongs to the MIC5159 family of programmable current limit µCap LDO regulator controllers. It is manufactured by Microchip Technology, formerly Micrel. The family includes both fixed voltage options like the 1.8V and 3.0V variants, as well as adjustable versions, all sharing the same core control architecture and SOT-23-6 packaging.

Replacement Considerations

MIC5159YM6-TR (Adjustable version)

FAQ

How is the current limit programmed?

The current limit is set by placing a sense resistor between the input and the IS pin. The threshold is determined by the formula RSENSE = 50mV / IOUT.

What is the function of the Enable pin?

The Enable pin controls the regulator state. A logic high turns the regulator on, while a logic low shuts it down into a low off-mode-current state.