Data Brief

For further information contact your local STMicroelectronics sales office.

March 2008

Rev 1

1/4

4

STEVAL-ISA045V2

2 A / 3.3 V high-efficiency synchronous buck converter

evaluation board based on the ST1S09

Features

Description

This evaluation board, based on the ST1S09

family of synchronous step-down DC-DC

converters, is optimized for powering all low-

voltage applications and, generally, replaces high

current linear solutions when power dissipation

may cause high heating of the application

environment.

It provides up to 2 A over an input voltage range

of 2.7 V to 5.5 V.

A high 1.5 MHz switching frequency allows the

use of tiny surface-mount components and in

addition to the resistor divider to set the output

voltage value, an inductor and two capacitors are

required.

A low output ripple is guaranteed by the current

mode PWM topology and by the use of low ESR

surface-mount ceramic capacitors.

The device is thermally protected and current

limited to prevent damage due to accidental short-

circuit.

The ST1S09 family is available in the DFN6 3x3

package.

STEVAL-ISA045V2

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