STEVAL-ISA186V1 38 V, 0.5 A synchronous step-down switching regulator

STEVAL-ISA186V1  38 V, 0.5 A synchronous step-down switching regulator
STEVAL-ISA186V1
38 V, 0.5 A synchronous step-down switching regulator
evaluation board based on A6985F5V
Data brief
Description
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
45 μA IQ at light load (LCM VIN = 12 V)
8 μA IQ-SHTDWN
Adjustable f SW (250 kHz - 2 MHz)
Fixed output voltage VOUT = 5 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
January 2016
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.
DocID028925 Rev 1
For further information contact your local STMicroelectronics sales
office
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www.st.com
NM
GND
VIN
TP6
TP5
PGND
+
SYNCH
L3
J4
MPZ2012S221A
+
TP3
4.7uF
C16
C13A
NM
C13
4.7uF
C15
VIN_FLT
10uF
C1
50V
1uF
C2
TP1
470nF
4.7uH
NM
L2
PGND
VIN_FLT
R2
NM
0
R1
C3
NM
R3
C11
J5
4.7uF
DocID028925 Rev 1
C14
J1
4
10nF
17
EP
DELAY
SS/INH
MLF
FSW
VCC
VIN
SYNCH
68nF
8
3
6
5
2
15
U1
C6
NM
10R
C5
VIN_EMI
TP8
R4
56k
R10
R11
10
SGND
R5
COMP
FB
LX
LX
VBIAS
RST
A6985F5V
11
12
PGND PGND
NM
7
9
13
14
16
1
R8
47p
power GND
signal GND
1.2p
150kC8
C4
J2
R9
NM
L1A
L1
R6
R7
C7
NM
4.7uH
J3
1M
0R
NM
10uF
C9
2/4
NM
TP7
TP4
TP2
GND
VOUT
RST
1
C10
SS/INH
Schematic diagram
STEVAL-ISA186V1
Schematic diagram
Figure 1: STEVAL-ISA186V1 schematic circuit
GSPG26012016DI1415
STEVAL-ISA186V1
2
Revision history
Revision history
Table 1: Document revision history
Date
Version
Changes
26-Jan-2016
1
Initial release.
DocID028925 Rev 1
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STEVAL-ISA186V1
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DocID028925 Rev 1
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