STEVAL-ISA084V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – 4 A peak, 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40

STEVAL-ISA084V1
4 A peak, 800 kHz fixed-frequency PWM synchronous step-down
demonstration board with enable on/off based on the ST1S40
Data brief
Features
■ V_in: 4 V to 18 V
■ V_out: 3.3 V
■ Maximum output current: 4 A
■ Switching frequency: 800 kHz
■ Short-circuit: protected
■ RoHS compliant
Description
The STEVAL-ISA084V1, based on the ST1S40, is
an internally compensated 800 kHz fixed-
frequency PWM synchronous step-down
converter demonstration board.
The ST1S40 operates from 4.0 V to 18 V input,
while it regulates an output voltage as low as 0.8
V and up to V_IN (100% duty-cycle).
The ST1S40 integrates 95 mΩ high side switch
and 69 mΩ synchronous rectifier allowing very
high efficiency with very low output voltages.
The peak current mode control with internal
compensation delivers a very compact solution
with a minimum component count.
The device is protected through cycle-by-cycle
current limiting in case of overload and is also
protected by current foldback function with
frequency reduction in case of short-circuit
The device is available with an enable on/off
function.
STEVAL-ISA084V1
November 2011
Doc ID 022542 Rev 1
For further information contact your local STMicroelectronics sales office.
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