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2A/3.3V high-efficiency synchronous buck converter evaluation board based on ST1S09I with suppression function

STEVAL-ISA046V2

Overview

This evaluation board, based on the ST1S09I family of synchronous step-down DC-DC converters, is optimized for powering all lowvoltage 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.
The ST1S09I features an inhibit function.
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 shortcircuit.
The ST1S09 family is available in the DFN6 3x3 package.

Main features

ST1S09I in the DFN6 3x3 package
Short-circuit protection
Input voltage range: 2.7 V to 5.5 V
Max I_out: 2 A
Output voltage: 3.3 V
Inhibit function
High internal switching frequency: 1.5 MHz

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-05-05 15:03:28

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