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4A peak 800kHz fixed frequency PWM synchronous buck demonstration board based on ST1S40IPHR with enable on/off function

STEVAL-ISA082V1

Overview

The STEVAL-ISA082V1, based on the ST1S40IPHR, is an internally compensated 800 kHz fixed-frequency PWM synchronous stepdown converter evaluation board.

The ST1S40 operates from 4.0 V to 18.0 V input, while it regulates an output voltage as low as 0.8 V and up to VIN (100% duty cycle).
The ST1S40 integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltage.
The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.
The ST1S40 is protected through cycle-by-cycle current limiting in case of overload and is also protected by a current foldback function with frequency reduction in case of short-circuit.
The device is available with an enable on/off function.

Main features

Input voltage Vin = 4 V to 18 V
Output voltage Vout = 3.3 V
Maximum output current: 3 A
Switching frequency: 800 kHz
Short-circuit protected
RoHS compliant

Design Files

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Update:2025-05-08 20:59:15

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