STEVAL-ISA187V1 38 V, 0.5 A synchronous step-down switching regulator

STEVAL-ISA187V1  38 V, 0.5 A synchronous step-down switching regulator
STEVAL-ISA187V1
38 V, 0.5 A synchronous step-down switching regulator
evaluation board based on A6985F
Data brief
Description
The STEVAL-ISA187V1 is a product evaluation
board based on the ST synchronous step-down
switching regulator A6985F, 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, 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.
Features
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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 and
VOUT =3.3 V)
8 μA IQ-SHTDWN
Adjustable f SW (250 kHz - 2 MHz)
Output voltage adjustable from 0.85 V to VIN
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
January 2016
The device can operate in low consumption
mode (LCM), with a quiescent current of 30 μA at
VIN=12 V and VOUT= 3.3 V 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, 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.
DocID028932 Rev 1
For further information contact your local STMicroelectronics sales
office
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VIN_FLT
GND
VIN
TP6
TP5
PGND
+
SYNCH
NM
C13A
L3
J4
MPZ2012S221A
+
TP3
TP1
NM
C13
4.7uF
SS/INH
10uF
C1
C16
470nF
4.7uH
NM
L2
PGND
VIN_FLT
R2
NM
0
R1
C3
NM
R3
C11
J5
J1
U1
10nF
17
EP
DELAY
SS/INH
MLF
FSW
VCC
VIN
SYNCH
68nF
8
3
6
5
2
15
4
C6
NM
10R
C5
VIN_EMI
TP8
R4
56k
R10
R11
10
SGND
R5
COMP
FB
LX
LX
VBIAS
RST
A6985F
11
12
PGND PGND
NM
7
9
13
14
16
1
R8
C4
27p
power GND
signal GND
1.2p
200k C8
J2
R9
33k
L1A
L1
R6
R7
C7
NM
4.7uH
J3
1M
200k
NM
10uF
C9
50V
1uF
C2
4.7uF
C15
DocID028932 Rev 1
4.7uF
NM
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C10
TP7
TP4
TP2
GND
VOUT
RST
1
C14
Schematic diagram
STEVAL-ISA187V1
Schematic diagram
Figure 1: STEVAL-ISA187V1 schematic circuit
GSPG27012016DI1116
STEVAL-ISA187V1
2
Revision history
Revision history
Table 1: Document revision history
Date
Version
Changes
27-Jan-2016
1
Initial release.
DocID028932 Rev 1
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STEVAL-ISA187V1
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DocID028932 Rev 1
Mouser Electronics
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STEVAL-ISA187V1
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