Data brief

For further information contact your local STMicroelectronics sales office.

July 2009

Doc ID 15973 Rev 1

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STEVAL-ISA047V2

1.5 A / 3.3 V step-down DC-DC converter

demonstration board based on the ST1S03A

Features

DC-DC converter

and power on delay of 50-100 µs

(overtemperature range)

Description

This demonstration board is based on the

ST1S03A, an adjustable current mode PWM

step-down DC-DC converter with internal 1.5 A

power switch, packaged in a 6-lead DFN 3x3 mm.

It's a complete 1.5 A switching regulator with its

internal compensation eliminating additional

component.

The constant frequency, current mode, PWM

architecture and stable operation with ceramic

capacitors results in low, predictable output ripple.

However, in order to maximize the power

conversion efficiency with light load, the regulator

reduces automatically the switching frequency

when the output load becomes less than 250 mA

typically.

STEVAL-ISA047V2

www.st.com