Data brief

For further information contact your local STMicroelectronics sales office.

November 2010

Doc ID 18212 Rev 1

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STEVAL-ISA043V2

1.5 A /1.2 V high-frequency synchronous buck converter

demonstration board based on the ST1S06

Features

modulation (PWM) synchronous, step-down

DC-DC converter with inhibit function

Description

This demonstration board, based on the ST1S06,

is an adjustable current-mode PWM synchronous,

step-down DC-DC converter with inhibit function.

It is optimized for powering all low-voltage

applications and, more generally, to replace the

high-current linear solution when the power

dissipation may cause overheating of the

application environment.

It provides up to 1.5 A over an input voltage range

of 2.5 V to 5.5 V.

A high switching frequency (1.5 MHz) enables the

use of tiny surface-mounted components (SMD).

In addition to the resistor divider used to set the

output voltage value, only an inductor and two

capacitors are required.

Moreover, low output ripple is guaranteed by the

current-mode PWM topology and by the use of

low series resistance (ESR) SMD ceramic

capacitors.

The device is thermal protected and current

limited to prevent damage due to accidental short

circuits.

It is a complete 1.5 A switching regulator with its

internal compensation eliminating the need for

additional components.

The constant-frequency, current-mode, PWM

architecture and stable operation with ceramic

capacitors results in a low, predictable output

ripple. To clamp the error amplifier reference

voltage, this device includes a soft-start control

block generating a voltage ramp.

The ST1S06 is available in a 6L-DFN 3x3

package.

STEVAL-ISA043V2

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