February 2016

DocID028957 Rev 1

1/4

For further information contact your local STMicroelectronics sales

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STEVAL-ISA189V1

38 V, 1.5 A synchronous step-down switching regulator

evaluation board based on A6986F5V

Data brief

Features

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AECQ100 qualification

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1.5 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-ISA189V1 is a product evaluation

board based on the ST synchronous step-down

switching regulator A6986F5V, which can deliver

up to 1.5 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 that ensures high

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, 500 kHz switching

feature enabled, but all of these settings can be

easily changed so the user can evaluate different

application scenarios.