Data brief

For further information contact your local STMicroelectronics sales office.

September 2010

Doc ID 18024 Rev 1

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STEVAL-ISA042V2

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

based on the ST1S03

Features

DC converter

components

maintain the regulation with light loads

Description

The STEVAL-ISA042V2 demonstration board is a

step-down DC-DC converter optimized for

powering the low-voltage digital core in HDD

applications and, more generally, replacing the

high-current linear solution when the power

dissipation may cause excessive heating of the

application environment. It provides up to 1.5 A

over an input voltage range of 3 V to 16 V.

A high switching frequency (1.5 MHz) allows the

use of tiny surface-mounted components, as well

as the use of a resistor divider to set the output

voltage value. Only an inductor, a Schottky diode,

and two capacitors are required. In addition, a low

output ripple is guaranteed by the current-mode

PWM topology and by the use of low ESR SMD

ceramic capacitors. The device is thermal

protected and current limited to prevent damage

due to accidental short-circuits.

It uses the ST1S03 device.

The ST1S03 is available in a DFN6 (3x3mm)

package.

STEVAL-ISA042V2

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