MIC5191YMM

Overview

The MIC5191YMM is an ultra high-speed linear regulator controller manufactured by Microchip Technology, housed in a 10-pin MSOP package. It operates with an input voltage range of 1.0V to 5.5V and supports adjustable output voltages down to 1.0V. The device features a +1.0% initial output tolerance and achieves dropout as low as 25mV at 10A. It provides a large signal bandwidth exceeding 500kHz and maintains PSRR greater than 40dB at 500kHz. The junction temperature range spans from –40°C to +125°C.

Feature Summary

• Ultra high-speed capabilities handle fast load demands for microprocessor cores and ASICs while maintaining clean output voltage.
• Filters out switching frequency noise on the input and provides excellent line and load regulation specifications.
• Logic controlled shutdown allows for efficient power management with current limit protection included.
• Stable with any output capacitor type, allowing flexible design choices for transient response optimization.

Applications

• Distributed power supplies
• ASIC power supplies
• DSP, µP, and µC power supplies

Procurement Notes

Verify the component origin carefully, as Micrel was acquired by Microchip Technology. Confirm that the specific ordering suffix matches the required package variant. Ensure all technical parameters align with the official datasheet before integration into final designs.

Selection Notes

Select this controller when driving external N-Channel MOSFETs for high-current applications requiring rapid transient response. Ensure the external MOSFET gate capacitance remains below 10nF to maintain optimal slew rates. Verify that the VCC supply voltage provides sufficient headroom above the output voltage and MOSFET threshold requirements.

Part Context

This component belongs to the MIC5191 family of ultra high-speed active filter and LDO controllers. It is designed to replace bulkier filtering solutions by utilizing an external pass element. The YMM suffix specifically denotes the MSOP-10 package configuration within the broader product lineup.

Replacement Considerations

MIC5191BML

FAQ

How does the MIC5191 handle stability with different output capacitors?

The MIC5191 is designed to be stable with any type or value of output capacitor, including ceramic types with low ESR and ESL, allowing designers to optimize for transient response without risking oscillation.

What is the function of the ISENSE pin regarding current limiting?

The ISENSE pin serves as the second input to the internal current limit comparator. Output current is limited when the voltage at the ISENSE pin drops 50mV below the VIN pin voltage.