STEVAL-ISA185V1 38 V, 0.5 A synchronous step-down switching regulator

STEVAL-ISA185V1  38 V, 0.5 A synchronous step-down switching regulator
STEVAL-ISA185V1
38 V, 0.5 A synchronous step-down switching regulator
evaluation board based on A6985F3V3
Data brief
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 highfrequency switching (programmable up to 2 MHz)
helps to 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)
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
January 2016
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.
DocID028905 Rev 1
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NM
VIN_FLT
GND
VIN
TP6
TP5
PGND
+
NM
C13
L3
J4
MPZ2012S221A
+
4.7uF
C16
C13A
TP3
10uF 50V
C1
4.7uF
C15
SYNCH
1uF
C2
TP1
0
R1
C3
470nF
4.7uH
NM
L2
PGND
VIN_FLT
R2
NM
NM
R3
C11
J5
4.7uF
DocID028905 Rev 1
C14
10nF
17
EP
DELAY
SS/INH
MLF
FSW
VCC
VIN
SYNCH
68nF
8
3
6
5
2
15
4
U1
C6
NM
10R
C5
VIN_EMI
TP8
J1
R4
56k
R10
R11
10
SGND
R5
11
12
PGND PGND
COMP
FB
LX
LX
VBIAS
RST
A6985F3V3
NM
7
9
13
14
16
1
R8
68p
power GND
signal GND
1.2p
110kC8
C4
R9
J2
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-ISA185V1
Schematic diagram
Figure 1: STEVAL-ISA185V1 board schematic
GSPG21012015DI1045
STEVAL-ISA185V1
2
Revision history
Revision history
Table 1: Document revision history
Date
Version
Changes
21-Jan-2016
1
Initial release.
DocID028905 Rev 1
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STEVAL-ISA185V1
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DocID028905 Rev 1
Mouser Electronics
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