SiC951
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Revision: 07-Feb-2023 1Document Number: 62195
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
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Reference Board User’s Manual
High Current microBRICK® DC/DC Regulator Module with PMBus
DESCRIPTION
The SiC951 is a complete package with no need for an
external inductor and minimal components. It is a PMBus
1.3 compliant non-isolated DC/DC buck regulator module
with integrated MOSFETs and inductor in a 10.6 mm x 6.5
mm x 3 mm thermally efficient package. It is capable of
supplying 25 A continuous with 30 A peak. It’s output
voltage is digitally adjustable from 0.3 V to 5.5 V from a 4.5
V to 20 V input with switching frequencies up to 1.5 MHz.
The SiC951 can accommodate a variety of applications,
including computing, consumer electronics, telecom, and
industrial. SiC951 architecture delivers ultrafast transient
response with minimum output capacitance and tight
regulation over a broad load range. The device has
integrated internal compensation and is stable with any type
of output capacitor. The device incorporates a power saving
scheme that significantly increases light load efficiency.
The SiC951 allows configuration programs to be stored in
non volatile memory (NVM). Operation parameters such as
VOUT, IOUT over temperature etc. can all be locally stored and
used to determine fault behavior. Operation is firmware
based and is field upgradable. The SiC951 is available in
lead (PB)-free power enhanced MLP60- A6 package.
APPLICATIONS
•Servers
• Networking, telecom, storage applications
• Ultrabook, notebook, desktop
• Distributed point of load power architectures
• Storage applications
• DDR memory
FEATURES
• Versatile
- Single supply operation from 4.5 V to 20 V input voltage
- Output current: 25 A continuous with 30 A peak
- Adjustable output voltage from 0.3 V to 5.5 V
- Built in 5 V regulator for internal circuits and driver supply
- ± 1 % output voltage accuracy over temperature
• Highly efficient
- close to 97 %
• Highly configurable
- PMBus 1.3 compliant with 1 MHz bus speed
- Internal NVM
- V
OUT adjustability and reading resolution of 2 mV
- Supports over 50 PMBus commands
- Ability to support sequential, tracking and simultaneous
operation
- Supports in phase or 180° out of phase synchronization
- Output voltage source and sink capability
• Robust and reliable
- V
IN, VOUT, IIN and IOUT and temperature reporting over
PMBus
- Over current protection in pulse-by-pulse mode
- Output over voltage protection
- Output under voltage protection
- Over temperature protection with hysteresis
- Dedicated enable pin for easy power sequencing
- Power good open drain output
- Remote sense amplifier with true differential voltage
sensing
- Ultrafast transient response
- Optional power saving mode
- Input power and output power monitoring
SiC951
www.vishay.com Vishay Siliconix
Revision: 07-Feb-2023 2Document Number: 62195
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
SPECIFICATIONS
This reference board allows the end user to evaluate the
SiC951 microBRICK® regulator module for its features and
all functionalities. It can also be served as a reference design
for a user’s application.
CONNECTION AND SIGNAL / TEST POINTS
Power Terminal
VIN (J1 - #1, #2), GND (J1 - #3, #4)
Connect a voltage source to this terminal. The input voltage
must be between 4.5 V and 20 V. An input of 12 V is a good
default voltage.
VOUT (J1 - #7, #8), GND (J1 - #5, #6)
Connect an electronic load to this terminal.
Fig. 1 - SiC951 EVB
SELECTION JUMPERS
Enable of Device
J6: this is the jumper that enables / disables the part. With
J6 two pins left open, the device is enabled. With J6 two
pins shorted, the device is disabled. The EN pin has an
internal pull-up to enable the device. The jumper pulls the
EN pin to GND to disable the device.
PMBUS CONNECTION AND CONFIGURATION
R4, shown in the schematic, sets the default VOUT to 1.05 V.
Output voltage can be changed with PMBus commands.
The VOUT defaults to the minimum of 0.6 V if R4 is missing
or shorted.
R5 sets the default frequency to 600 kHz, this can be
changed with PMBus commands. The frequency defaults to
600 kHz if the resistor is missing or shorted. The PMBus
interface is described in the SiC951 datasheet and can be
found on our website.
PMBus SDA (J2 - #2)
PMBus SCL (J2 - #4)
PMBus SALERT (J2 - #6)
Resistors R7, R8, R9 are DNP, these can be populated with
10 k pull-up resistors if the PMBus interface being used
does not perform this function already.
SIGNALS AND TEST LEADS
Input Voltage Sense
VIN_SENSE (J8), GNDIN_SENSE (J9): this allows the user to
measure the voltage directly at the input of the regulator
bypassing any losses generated by connections to the
board.
Output Voltage Sense
VOUT_SENSE (J10), GNDOUT_SENSE (J11): this allows the user
to measure the output voltage directly at the sense point of
the regulator bypassing any losses generated by
connections to the board.
Power Good Indicator
PGOOD (J5): is an open drain output and is pulled up with a
100 k resistor. See SiC951 datasheet for details on fault
conditions.
Snubber Circuit
Snubber may be used when the user desires to decrease the
peak voltage of switching node (SW) during turn on of the
high side switch. There are place holders on the reference
board, R14, and C26, for the snubber.
SiC951
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Revision: 07-Feb-2023 3Document Number: 62195
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
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PCB LAYOUT
Fig. 2 - Top Layer
Fig. 3 - Inner Layer 3
Fig. 4 - Inner Layer 5
Fig. 5 - Inner Layer 2
Fig. 6 - Inner Layer 4
Fig. 7 - Inner Layer 6
SiC951
www.vishay.com Vishay Siliconix
Revision: 07-Feb-2023 4Document Number: 62195
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Fig. 8 - Inner Layer 7 Fig. 9 - Bottom Layer
SiC951
www.vishay.com Vishay Siliconix
Revision: 07-Feb-2023 5Document Number: 62195
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
SCHEMATIC
PMBus connector
External PV
cc
R8
DNP
C26 DNP
C16
100uF
C13
100uF
C9
220uF
C17
100uF
R2
100k
C31
100uF
R9
DNP
J11
TP4
1
C8
22uF
C11
100uF
R11
DNP
C18
100uF
C20 1u
C32
100uF
J9
TP4
1
J14
TP4
1
R5
2.87k
J5
TP2
1
J6
CON2
1
R3
0.845k
C2
0.1uF
J1
CON8
1
2
3
4
5
6
7
8
C10
0.1u
C19
100uF
C21 0.1u
IC1
SiC951
SALERT
34
SDAT
35
SCLK
36
V
DD
39
V
SEN+
16
P
GND4
43
P
GNG1
46
V
IN1
47
V
IN3
4
PHASE2
6
BOOT
12
A
GND1
37
V
SET
38
ADDR
13
A
GND2
14
P
GOOD
15
PHASE
42
LX1
48
V
DRV
40
GL
41
LX2
49
LX3
50
LX4
51
LX5
52
LX6
53
LX7
54
LX8
55
LX9
56
LX10
57
LX12
59
A
GND PAD
61
PHASE1
7
V
IN
8
GH
9
REF_IN
17
V
OUT14
19
V
OUT13
20
V
OUT12
21
V
OUT11
22
V
OUT10
23
V
OUT9
24
V
OUT8
25
V
OUT7
26
V
OUT6
27
V
IN2
5
EN
11
P
GND3
44
LX11
58
V
CIN
10
V
SEN-
18
V
OUT5
28
LX13
60
LX14
1
LX15
2
LX16
3
V
OUT4
29
V
OUT3
30
V
OUT1
32
P
GND PAD
63
V
OUT2
31
P
GND2
45
SYNC
33
V
IN PAD
62
R7
DNP
J7
TP2
1
J3
PV
cc
1
C27
100uF
R10
100k
C3
22uF
R6
0
J13
TP4
1
C28
100uF
C4
22uF
J4
GND
1
C1
100n
J10
TP4
1
C7
22uF
R13 0
C14
100uF
J8
TP4
1
C12
100uF
C29
100uF
C5
22uF
R1
0
J2
CON10A
1 2
4
56
78
910
C6
22uF
R14
DNP
C15
100uF
R12 0
R4
2.87k
C30
100uF
V
IN
V
OUT
PG V
IN
V
IN_ GND
V
O_GND
V
O
SALRT
SYNC
V
cc
PG
V
OUT
GH
SDA
SCL
EN
V
IN
phase
BOOT V
cc
GL
V
IN
LX
SDA
SCL
3.3V
SALRT
EN
A_PB02 A_PB03
P
VCC
V
OUT
EN V
cc
V
cc
3
2
C22 1u
SiC951
www.vishay.com Vishay Siliconix
Revision: 07-Feb-2023 6Document Number: 62195
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
SCHEMATIC, DESIGN, BILL OF MATERIALS, AND GERBER FILES FOR PCB FABRICATION
These files are as follows and available for download at
www.vishay.com/power-ics/integrated-microbrick/list/product-71554/tab/documents/
• “*.DSN” for schematic design file
• “*.DBK” for data backup file for Orcad
• “.opj” Orcad project file. Any schematic work should always be opened with the opj file. Use of a DSN file for this purpose is
not advised
• “*.xlsx” is the bill of materials (BOM) derived from the schematic
• “*.PDF” is the PDF version of the schematic from the “*.DSN” file
BILL OF MATERIAL REPORT
SYM_NAME COMP_DEVICE_TYPE COMP VALUE SPEC FOR ORDER QTY REFDES
C0402-TDK1 CAPACITOR NON-POL 0.1 μF Cap. cer 0.1 μF, 50 V, X7R, 0402 1 C1, C2
C1210-TDK CAPACITOR NON-POL 22 μF Cap. cer 22 μF, 25 V, X7R, 1210 6 C3, C4, C5, C6, C7, C8
cap_rad CAP 220 μF Cap. alu 220 μF, 20 %, 35 V,
radial 1C9
C0603-TDK1 CAPACITOR NON-POL 0.1 μF 2 C10, C21
C1210-TDK CAPACITOR NON-POL 100 μF 15
C11, C12, C13, C14, C15,
C16, C17, C18, C19, C27,
C28, C29, C30, C31, C32
C0603-TDK1 CAPACITOR NON-POL 1 μF Cap. cer 1 μF, 25 V, X7R, 0603 2 C20, C22
C0603-TDK1 CAPACITOR NON-POL DNP / Snubber C 0 C26
SiC951 SiC951 SiC951 1 IC1
PHC8 CON8 CON8 1 J1
SHF-105-01-X-D-T
HCON10A CON10A 1 J2
TP30 CON1 PVCC PC test point, red 1 J3
TP30 CON1 GND PC test point, black 1 J4
TP30 CON1 TP2 PC test point, red 2 J5, J7
MINIJUMPER2 CON2_MINIJUMPER2_CON2 CON2 1 J6
TP30 CON1 TP4 PC test point 6 J8, J9, J10, J11, J13, J14
R0402-VISHAY1 R 0 Res. SMD 0 k, 1 %, 1/16 W,
402 4 R1, R6, R12, R13
R0402-VISHAY1 R 100 kRes. SMD 100 k, 1 %, 1/16 W,
402 1R2
R0402-VISHAY1 R 0.845 kRes. SMD 845 , 1 %, 1/16 W,
402 1R3
R0402-VISHAY1 R 2.87 kRes. SMD 2.87 k, 1 %, 1/16 W,
402 2R4, R5
R0402-VISHAY1 R DNP / 10 kRes. SMD 10 k, 1 %, 1/16 W,
402 0 R7, R8, R9
R0402-VISHAY1 R 100 kRes. SMD 100 k, 1 %, 1/16 W,
402 1R10
R0603-VISHAY1 R DNP / < 10 0R11
R1206-VISHAY R DNP / Snubber R 0 R14
/