DESCRIPTION
The MP4459 is a high frequency step-down switching regulator with an integrated internal high-side high voltage power MOSFET. It provides 1.5A output with current mode control for fast loop response and easy compensation.
The wide 3.8V to 36V input range accommodates a variety of step-down applications, including those in automotive systems. A 120μA operational quiescent current is suitable for use in battery-powered applications.
The frequency foldback helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation.
In some applications, such as AM radio and ADSL applications, in which the device is sensitive to frequency band, the MP4459 can avoid the related EMI problem by setting the frequency at 4MHz.
The MP4459 is available in thin 10-pin 3mm x 3mm TQFN package.

FEATURES
• 120μA Quiescent Current
• Wide 3.8V to 36V Operating Input Range
• 150mΩ Internal Power MOSFET
• Up to 4MHz Programmable Switching Frequency
• Ceramic Capacitor Stable
• Internal Soft-Start
• Precision Current Limit without a Current Sensing Resistor
• Up to 95% Efficiency
• Output Adjustable from 0.8V to 30V
• Available in 10-Pin 3x3mm TQFN Package

APPLICATIONS
• High Voltage Power Conversion
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Battery Powered Systems