January 2016

DocID028905 Rev 1

1/4

For further information contact your local STMicroelectronics sales

office

www.st.com

STEVAL-ISA185V1

38 V, 0.5 A synchronous step-down switching regulator

evaluation board based on A6985F3V3

Data brief

Features



AECQ100 qualification



0.5 A DC output current



4 V to 38 V operating input voltage



Low consumption mode or low noise mode













Embedded output voltage supervisor



Synchronization



Adjustable soft-start time



Internal current limiting



Overvoltage protection



Output voltage sequencing



Peak current mode architecture





Thermal shutdown



RoHS compliant

Description

The STEVAL-ISA185V1 is a product evaluation

board based on the ST synchronous step-down

switching regulator A6985F3V3, 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, renders the

A6985F3V3 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 to 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,

hence ensuring the high efficiency under light

load condition required in typical car body

applications that are active during car parking. 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

the switchover feature enabled, but all of these

settings can be easily changed so the user can

evaluate different application scenarios.