STEVAL-ISA185V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Adjustable soft-start time

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
 Programmable ISKIP current
 30 μA IQ at light load (LCM VIN = 12 V)
 8 μA IQ-SHTDWN
 Adjustable f SW (250 kHz - 2 MHz)
 Fixed output voltage VOUT = 3.3 V
 Embedded output voltage supervisor
 Synchronization
 Adjustable soft-start time
 Internal current limiting
 Overvoltage protection
 Output voltage sequencing
 Peak current mode architecture
 RDS(on)HS = 360 mΩ ; RDS(on)LS = 150 mΩ
 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
MHz switching frequency, high ISKIP current and
the switchover feature enabled, but all of these
settings can be easily changed so the user can
evaluate different application scenarios.
January 2016
DocID028905 Rev 1
For further information contact your local STMicroelectronics sales
office
1/4
www.st.com