MIC2225-4MYMT

Overview

The MIC2225-4MYMT is a dual-output voltage regulator manufactured by Micrel, now part of Microchip Technology. It integrates a high-efficiency 2MHz PWM synchronous buck (step-down) DC/DC converter and a 300mA Low Dropout (LDO) regulator. The switching regulator accepts an input voltage range of 2.7V to 5.5V and delivers up to 600mA output current with internal power MOSFETs. The device operates at a constant 2MHz frequency in PWM mode, achieving greater than 95% efficiency. It is housed in a compact 10-pin 2mm x 2mm Thin MLF package and supports fixed output voltages down to 1V.

Feature Summary

• Integrates a 2MHz synchronous buck converter and a 300mA LDO in a single ultra-small package
• Features fully integrated internal power MOSFET switches for high efficiency and minimal external component count
• Includes micropower shutdown capability reducing quiescent current to 1mA
• Provides thermal shutdown and current limit protection for enhanced reliability

Applications

• Application processor core and I/O supply rails
• Camera DSP power management
• Multimedia chipset power distribution

Procurement Notes

Verify the manufacturer origin, as Micrel was acquired by Microchip Technology. Confirm the specific suffix indicates the fixed output voltage variant required for the design. Ensure the package type matches the 10-pin 2mm x 2mm Thin MLF specification. Check RoHS compliance status if required by the target assembly process. Validate that the operating temperature range meets the environmental requirements of the final application.

Selection Notes

Select this component when space-constrained portable designs require both a high-current switching regulator and a low-noise LDO. The 2MHz switching frequency allows for smaller external inductors and capacitors compared to lower-frequency alternatives. The fixed output version simplifies design by removing external feedback resistors. Consider the 600mA buck and 300mA LDO current limits to ensure they meet the peak load demands of the application processors or DSPs being powered.

Part Context

The MIC2225 series is designed for portable electronics requiring efficient power management in small form factors. It combines the high efficiency of a synchronous buck converter with the low noise of an LDO. This dual-output architecture reduces board space and component count. The family targets applications like mobile phones, PDAs, and digital cameras where battery life and physical size are critical constraints.

Replacement Considerations

MIC2225-4KYMT TR

FAQ

What is the switching frequency of the MIC2225-4MYMT?

The MIC2225-4MYMT operates at a constant 2MHz frequency in PWM mode.

Does the MIC2225-4MYMT include protection features?

Yes, it includes thermal shutdown and current limit protection.

What is the maximum output current for the buck converter section?

The synchronous buck converter can supply up to 600mA of output current.