AN2815 datasheet(1/42 Pages) STMICROELECTRONICS

Part #	AN2815

Description	High-efficiency step-down controller

PDF	42 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 42 page

August 2008

Rev 1

1/42

AN2815

Application note

High-efficiency step-down controller

with embedded 2 A LDO regulator

Introduction

The PM6675AS device consists of a single, high-efficiency step-down controller and an

independent low dropout (LDO) linear regulator.

The constant on-time (COT) architecture assures fast transient response supporting both

electrolytic and ceramic output capacitors. An embedded integrator control loop

compensates the DC voltage error due to the output ripple.

Selectable low-consumption mode allows the highest efficiency over a wide range of load

conditions. The low-noise mode sets the minimum switching frequency to 33 kHz for audio-

sensitive applications. The LDO linear regulator can sink and source up to 2 Apk. Two fixed

current limits (±1 A and ±2 A) can be chosen.

An active soft-end is independently performed on both the switching and the linear

regulators outputs when disabled.

Figure 1.

PM6675AS demonstration board

www.st.com

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