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1.5 A/3.3 V step-down DC-DC converter demonstration board based on ST1S03

STEVAL-ISA042V2

Overview

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.

Main features

Adjustable current-mode PWM step-down DC-DC converter
Output voltage, V_out: 3.3 V
Output current, I_out: 1.5 A
Internal compensation to eliminate additional components
Pulse skipping for I_outlower than 15 mA, to maintain the regulation with light loads
RoHS compliant

Design Files

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Update:2025-06-20 12:56:50

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