MP4350DQ-LF-Z

Overview

The MP4350DQ-LF-Z is a high-frequency buck switching regulator from Monolithic Power Systems, designed for efficient voltage step-down applications. It integrates an internal high-voltage power MOSFET and operates with a wide input voltage range of 4.5V to 20V. The device delivers up to 2.5A output current with a peak switch current capability of 3A. Key electrical parameters include a 100µA operating quiescent current, adjustable output voltage from 0.8V to 16V, and a fixed switching frequency of 4MHz. It features internal soft-start, overcurrent protection, and thermal shutdown. The component is housed in a compact 3mm x 3mm 10-pin QFN package and supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates internal high-side power MOSFET for simplified external component requirements
• Provides fast transient response through current control mode architecture
• Includes comprehensive protection mechanisms such as overcurrent and thermal shutdown

Applications

• Battery-powered portable electronics requiring low static current
• Automotive systems with varying input voltage environments
• Industrial equipment needing stable DC-DC conversion

Procurement Notes

Verify the specific suffix designation against official MPS documentation to confirm package type and tape/reel specifications. Confirm that the NRND status does not impact existing production schedules. Ensure compatibility with required input voltage ranges and thermal management solutions for the QFN-10 footprint before finalizing procurement orders.

Selection Notes

Select this component when a 4MHz switching frequency is required to minimize EMI interference with AM radio or ADSL signals. Consider the 100µA quiescent current for battery-sensitive designs. Evaluate the 3mm x 3mm QFN package size constraints against available PCB real estate. Verify that the 20V maximum input voltage aligns with system supply rails.

Part Context

This part belongs to the MP4350 series of non-synchronous buck converters. It is positioned as a solution for applications demanding high efficiency and small form factors. The device complements other PMIC offerings by providing robust performance in space-constrained environments while maintaining stability with ceramic capacitors.

Replacement Considerations

MP2393GTL-Z is identified as an alternative for new designs.