MP4459

1.5A, 4MHz, 36V Step-Down Converter

Datasheet

概要

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 4.5V to 36V input range accommodates a variety of step-down applications, including those in automotive systems. A 100µA 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 3x3mm TQFN package.

機能と利点

100μA Quiescent Current
Wide 4.5V to 36V Operating Input Range
50mΩ 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 36V
Available in 10-Pin 3x3mm TQFN Package

アクティブ部品番号

MP4459DQT-LF-P MP4459DQT-LF-P MP4459DQT-LF-Z

Evaluation Tools

EV4459DQT-00A Evaluation Kit 1.5A, 4MHz, 36V Step-Down Converter

The EV4459DQT-00A is an evaluation board for the MP4459, a high frequency step-down switching regulator with an integrated internal high-side high voltage power MOSFET. The IC provides 1.5A output with current mode control for fast loop response and easy compensation.

High power conversion efficiency over a wide load range is achieved by scaling down the switching frequency at light load condition to reduce the switching and gate driving losses.

The frequency foldback helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation.

By switching at 4MHz, the MP4459 prevents EMI (Electromagnetic Interference) noise problems, such as those found in AM radio and ADSL applications.

￥2,740.25
+ tax