STEVAL-ISA158V1 38 V, 2 A synchronous step-down switching regulator evaluation

STEVAL-ISA158V1  38 V, 2 A synchronous step-down switching regulator evaluation
STEVAL-ISA158V1
38 V, 2 A synchronous step-down switching regulator evaluation
board based on the A6986
Data brief
Description
The STEVAL-ISA158V1 is a product evaluation
board based on ST's A6986, a 38 V, 2 A
synchronous step-down switching regulator with
30 µA of quiescent current. It is designed for
automotive system battery-powered applications.
It can be used in low consumption mode (LCM)
such as in car body implementations, or in low
noise mode (LNM) such as in car audio
applications.
Features
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4 V to 38 V operating input voltage
Low consumption mode or low noise mode
30 µA IQ at light load (LCM VOUT = 3.3 V)
5 µA IQ-SHTDWN
Adjustable fSW (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 = 180 mΩ; RDS(on)LS = 150 mΩ
Thermal shutdown
RoHS compliant
January 2015
DocID027297 Rev 1
For further information contact your local STMicroelectronics sales
office
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www.st.com
GND
VIN
PGND
VIN_FLT
SYNCH
TP6
TP5
+
TP3
NM
C13
50V
10uF
C1
50V
NM
size 0805
L3
NM
C11
NM
C16
SS/INH
L2
470nF
10 V
R2
NM
0
R1
C3
NM
R3
4.7uH
J1
PGND
VIN_EM I
17
EP
DELAY
SS/INH
ML F
FSW
VCC
VIN
10nF
TP8
U1
SYNCH
68nF
8
3
6
5
2
15
4
C6
0
R10
C5
10
R11
VIN_FLT
R4
0
4.7uF
1uF
C2
4.7uF
C15
DocID027297 Rev 1
C14
2/5
10
SGND
R5
COM P
FB
LX
LX
VBIAS
RST
L6986
11
12
PGND PGND
NM
7
9
13
14
16
1
R8
120p
power GND
signal GND
2.2p
130k C8
C4
R9
J2
62k
L1
R6
R7
C7
10uH
J3
1M
180k
NM
47uF 16V
C9
GND
TP7
VOUT
TP4
RST
TP2
1
NM
C10
TP1
Schematic diagram
STEVAL-ISA158V1
Schematic diagram
Figure 1: STEVAL-ISA158V1 circuit schematic
GSPG1212141030SG
STEVAL-ISA158V1
Schematic diagram
Table 1: BOM list
Reference
Part number
Description
Manufact.
C1
CGA5L3X5R1H106K
10 µF - 1206 - 50 V - X7R - 10%
TDK
C2
C2012X7S2A105K
1 µF - 0805 - 50 V - X7S - 10%
TDK
C3
470 nF - 50 V - 0603
C4
2.2 pF - 50 V - 0603
C5
68 nF - 50 V - 0603
C6
10 nF - 50 V - 0603
C8
120 pF - 50 V - 0603
C9
C3216X5R1C476M
47 µF - 1206 - 16 V - X5R - 20%
TDK
C14, C15, C16
C3216X7R1H475K160AC
4.7 µF - 1206 - 50 V - X7R - 10%
TDK
C7, C10, C11, C13
Not mounted
R1, R4
0 R - 0603
R6
1 MΩ - 1% - 0603
R7
180 kΩ - 1% - 0603
R8
130 kΩ - 1% - 0603
R9
62 kΩ - 1% - 0603
R11
10 Ω - 1% - 0603
R2, R3, R5, R10
Not mounted
L1
XAL5050-103MEC
10 µH
Coilcraft
L2
XAL5030-472MEC
4.7 µH
Coilcraft
L3
MPZ2012S221A
EMC bead
TDK
J1
Open
J2
Open
J3
Closed
J4
Open
U1
A6986
Switchover
ST
DocID027297 Rev 1
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Revision history
2
STEVAL-ISA158V1
Revision history
Table 2: Document revision history
4/5
Date
Rev
15-Jan-2015
1
DocID027297 Rev 1
Changes
First release.
STEVAL-ISA158V1
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© 2015 STMicroelectronics – All rights reserved
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