January 2016

DocID028932 Rev 1

1/4

For further information contact your local STMicroelectronics sales

office

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STEVAL-ISA187V1

38 V, 0.5 A synchronous step-down switching regulator

evaluation board based on A6985F

Data brief

Features

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AECQ100 qualification

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0.5 A DC output current

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4 V to 38 V operating input voltage

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Low consumption mode or low noise mode

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Embedded output voltage supervisor

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Synchronization

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Adjustable soft-start time

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Internal current limiting

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Overvoltage protection

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Output voltage sequencing

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Peak current mode architecture

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Thermal shutdown

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RoHS compliant

Description

The STEVAL-ISA187V1 is a product evaluation

board based on the ST synchronous step-down

switching regulator A6985F, which can deliver up

to 0.5 A and, with its 100% duty cycle ability to

withstand cold crank events and wide input

operating voltage range, represents the ideal

choice for battery-powered automotive systems.

Synchronous rectification helps achieve higher

efficiency at full load as well as application

compactness, while high-frequency switching

(programmable up to 2 MHz) helps reduce the

cost and size of power passive components while

remaining outside the AM band.

The device can operate in low consumption

mode (LCM), with a quiescent current of 30 μA at

efficiency under light load, which is a requirement

in typical car body applications that are active

when a car is parked. A low noise mode (LNM)

can be selected to meet the requirements of

infotainment applications with forced PWM mode

under all load conditions. The default board

configuration is LCM active, 2 MHz switching

feature enabled, but all of these settings can be

easily changed so the user can evaluate different

application scenarios.