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38 V, 0.5 A synchronous step-down switching regulator
evaluation board based on A6985F5V
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 I
SKIP
current
45 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
= 5 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
= 360 mΩ; R
DS(on)LS
= 150 mΩ
Thermal shutdown
RoHS compliant
Description
The STEVAL-ISA186V1 is a product evaluation
board based on the A6985F5V ST synchronous
step-down switching regulator, 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 A6985F5V
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 45 μA, hence ensuring the
high efficiency under light load condition required
in typical car body applications that are active
when the 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
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.
