STEVAL-ISA188V1
38 V, 1.5 A synchronous step-down switching regulator
evaluation board based on A6986F3V3
Data brief
Description
The STEVAL-ISA188V1 is a product evaluation
board based on the ST synchronous step-down
switching regulator A6986F3V3, 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
frequency, high I
SKIP
current and the switchover
feature enabled, but all of these settings can be
easily changed so the user can evaluate different
application scenarios.
Features
AECQ100 qualification
1.5 A DC output current
4 V to 38 V operating input voltage
Low consumption mode or low noise mode
Programmable I
SKIP
current
30 μA I
Q
at light load (LCM V
IN
= 12 V)
8 μA I
Q-SHTDWN
Adjustable f
SW
(250 kHz - 2 MHz)
Fixed output voltage V
OUT
= 3.3 V
Embedded output voltage supervisor
Synchronization
Adjustable soft-start time
Internal current limiting
Overvoltage protection
Output voltage sequencing
Peak current mode architecture
R
DS(on)HS
= 180 mΩ; R
DS(on)LS
= 150 mΩ
Thermal shutdown
RoHS compliant
February 2016
DocID028953 Rev 1
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www.st.com
For further information contact your local STMicroelectronics sales
office
STEVAL-ISA188V1
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