SiC634
www.vishay.com
Vishay Siliconix
50 A VRPower® Integrated Power Stage
DESCRIPTION
FEATURES
The SiC634 is integrated power stage solutions optimized
for synchronous buck applications to offer high current, high
efficiency, and high power density performance. Packaged
in Vishay’s proprietary 5 mm x 5 mm MLP package, SiC634
enables voltage regulator designs to deliver up to 50 A
continuous current per phase.
• Thermally enhanced PowerPAK® MLP55-31L
package
• Vishay’s Gen IV MOSFET technology and a
low-side MOSFET with integrated Schottky
diode
• Delivers in excess of 50 A continuous current, 55 A at
10 ms peak current
• High efficiency performance
• High frequency operation up to 2 MHz
• Power MOSFETs optimized for 19 V input stage
• 5 V PWM logic with tri-state and hold-off
• Supports PS4 mode light load requirement for IMVP8 with
low shutdown supply current (5 V, 3 μA)
• Under voltage lockout for VCIN
The internal power MOSFETs utilizes Vishay’s
state-of-the-art Gen IV TrenchFET® technology that delivers
industry benchmark performance to significantly reduce
switching and conduction losses.
The SiC634 incorporates an advanced MOSFET gate driver
IC that features high current driving capability, adaptive
dead-time control, an integrated bootstrap Schottky diode,
and zero current detection to improve light load efficiency.
The driver is also compatible with a wide range of PWM
controllers, supports tri-state PWM, and 5 V PWM logic.
A user selectable diode emulation mode (ZCD_EN#) is
included to improve the light load performance. The device
also supports PS4 mode to reduce power consumption
when system operates in standby state.
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• Multi-phase VRDs for computing, graphics card and
memory
• Intel IMVP-8 VRPower delivery
- VCORE, VGRAPHICS, VSYSTEM
platforms
AGENT
Skylake, Kabylake
- VCCGI for Apollo Lake platforms
• Up to 24 V rail input DC/DC VR modules
TYPICAL APPLICATION DIAGRAM
5V
VIN
V IN
VDRV
BOOT
PHASE
VCIN
ZCD_EN#
PWM
controller
PWM
VSWH
VOUT
Gate
driver
PGND
GL
C GND
Fig. 1 - SiC634 Typical Application Diagram
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
1
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
SiC634
www.vishay.com
Vishay Siliconix
22 VSWH
VSWH 22
21 VSWH
VSWH 21
N.C. 4
20 VSWH
VSWH 20
BOOT 5
19 VSWH
VSWH 19
18 VSWH
VSWH 18
17 VSWH
VSWH 17
16 VSWH
VSWH 16
PGND
N.C. 6
VIN
VIN 8
N.C.
VDRV
PGND
VSWH
GL
N.C.
3 VCIN
4 N.C.
35
PGND
5 BOOT
6 N.C.
34
VIN
7 PHASE
8 VIN
PGND
PGND
15 14 13 12
PGND
PGND
PGND
PGND
12 13 14 15
VIN
VIN
10 11
VIN
9
2 ZCD_EN#
32
CGND
PGND
PHASE 7
1 PWM
GL
11 10
9
VIN
VSWH 23
VIN
CGND
VCIN 3
23 VSWH
VIN
GL
24 25 26 27 28 29 30 31
PGND
PWM 1
VSWH
VSWH
VSWH
GL
VSWH
PGND
VDRV
N.C.
N.C.
33
GL
31 30 29 28 27 26 25 24
ZCD_EN# 2
VSWH
PINOUT CONFIGURATION
Fig. 2 - SiC634 Pin Configuration
PIN CONFIGURATION
PIN NUMBER
NAME
1
PWM
2
ZCD_EN#
3
VCIN
5
BOOT
4, 6, 30, 31
N.C.
FUNCTION
PWM input logic
The ZCD_EN# pin enables or disables diode emulation. When ZCD_EN# is LOW, diode emulation is
allowed. When ZCD_EN# is HIGH, continuous conduction mode is forced.
ZCD_EN# can also be put in a high impedance mode by floating the pin. If both ZCD_EN# and PWM
are floating, the device shuts down and consumes typically 3 μA (9 μA max.) current
Supply voltage for internal logic circuitry
High-side driver bootstrap voltage
Pin 4 can be either left floating or connected to CGND. Internally it is either
connected to GND or not internally connected depending on manufacturing
location.
Factory code “G” on line 3, pin 4 = CGND
Factory code “T” on line 3, pin 4 = not internally connected
7
PHASE
8 to 11, 34
VIN
12 to 15, 28, 35
PGND
Power ground
16 to 26
VSWH
Phase node of the power stage
27, 33
GL
29
VDRV
Supply voltage for internal gate driver
32
CGND
Signal ground
P/N
P/N
LL
LL
GYWW
TYWW
Return path of high-side gate driver
Power stage input voltage. Drain of high-side MOSFET
Low-side MOSFET gate signal
ORDERING INFORMATION
PART NUMBER
SiC634CD-T1-GE3
SiC634DB
S20-0485-Rev. C, 29-Jun-2020
PACKAGE
MARKING CODE
OPTION
PowerPAK MLP55-31L
SiC634
5 V PWM optimized
Reference board
Document Number: 76784
2
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
SiC634
www.vishay.com
Vishay Siliconix
PART MARKING INFORMATION
= pin 1 indicator
P/N = part number code
P/N
= Siliconix logo
= ESD symbol
LL
FYWW
F
= assembly factory code
Y
= year code
WW
LL
= week code
= lot code
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL PARAMETER
CONDITIONS
LIMIT
VIN
-0.3 to +28
Control logic supply voltage
VCIN
-0.3 to +7
Drive supply voltage
VDRV
Input voltage
Switch node (DC voltage)
-0.3 to +7
-0.3 to +28
VSWH
Switch node (AC voltage) (1)
BOOT voltage (DC voltage)
-7 to +35
BOOT to PHASE (DC voltage)
40
-0.3 to +7
VBOOT-PHASE
BOOT to PHASE (AC voltage) (3)
-0.3 to +8
All logic inputs and outputs
(PWM, ZCD_EN#)
-0.3 to VCIN +0.3
Max. operating junction temperature
TJ
150
Ambient temperature
TA
-40 to +125
Storage temperature
Tstg
-65 to +150
Human body model, JESD22-A114
2000
Charged device model, JESD22-C101
1000
Electrostatic discharge protection
V
33
VBOOT
BOOT voltage (AC voltage) (2)
UNIT
°C
V
Notes
• Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability
(1) The specification values indicated “AC” is V
SWH to PGND -8 V (< 20 ns, 10 μJ), min. and 35 V (< 50 ns), max.
(2) The specification value indicates “AC voltage” is V
BOOT to PGND, 40 V (< 50 ns) max.
(3) The specification value indicates “AC voltage” is V
BOOT to VPHASE, 8 V (< 50 ns) max.
RECOMMENDED OPERATING RANGE
ELECTRICAL PARAMETER
Input voltage (VIN)
MINIMUM
TYPICAL
MAXIMUM
4.5
-
24
Drive supply voltage (VDRV)
4.5
5
5.5
Control logic supply voltage (VCIN)
4.5
5
5.5
5.5
BOOT to PHASE (VBOOT-PHASE, DC voltage)
4
4.5
Thermal resistance from junction to ambient
-
10.6
-
Thermal resistance from junction to case
-
1.6
-
S20-0485-Rev. C, 29-Jun-2020
UNIT
V
°C/W
Document Number: 76784
3
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
SiC634
www.vishay.com
Vishay Siliconix
ELECTRICAL SPECIFICATIONS
(ZCD_EN# = 5 V, VIN = 12 V, VDRV and VCIN = 5 V, TA = 25 °C, unless otherwise stated)
PARAMETER
SYMBOL
TEST CONDITION
LIMITS
MIN.
TYP.
MAX.
VPWM = FLOAT
-
80
-
VPWM = FLOAT, VZCD_EN# = 0 V
-
120
-
fS = 300 kHz, D = 0.1
-
300
-
UNIT
POWER SUPPLY
Control logic supply current
Drive supply current
PS4 mode supply current
IVCIN
μA
fS = 300 kHz, D = 0.1
-
10
20
fS = 1 MHz, D = 0.1
-
30
-
IVCIN + IVDRV
VPWM = VZCD_EN# = FLOAT,
TA = -10 °C to +100 °C
-
3
9
μA
VF
IF = 2 mA
-
-
0.65
V
IVDRV
mA
BOOTSTRAP SUPPLY
Bootstrap diode forward voltage
PWM CONTROL INPUT
Rising threshold
VTH_PWM_R
3.6
3.9
4.2
Falling threshold
VTH_PWM_F
0.72
1
1.3
Tri-state voltage
VTRI
-
2.5
-
VTRI_TH_R
1.1
1.35
1.6
Tri-state rising threshold
Tri-state falling threshold
VPWM = FLOAT
VTRI_TH_F
3.4
3.7
4
Tri-state rising threshold hysteresis
VHYS_TRI_R
-
325
-
Tri-state falling threshold hysteresis
VHYS_TRI_F
-
250
-
VPWM = 5 V
-
-
350
VPWM = 0 V
-
-
-350
PWM input current
IPWM
V
mV
μA
ZCD_EN# CONTROL INPUT
Rising threshold
VTH_ZCD_EN#_R
3.3
3.6
3.9
Falling threshold
VTH_ZCD_EN#_F
1.1
1.4
1.7
Tri-state voltage
VTRI_ZCD_EN#
-
2.5
-
VTRI_ZCD_EN#_R
1.5
1.8
2.1
Tri-state rising threshold
Tri-state falling threshold
VZCD_EN# = FLOAT
VTRI_ZCD_EN#_F
2.9
3.15
3.4
Tri-state rising threshold hysteresis
VHYS_TRI_ZCD#_R
-
375
-
Tri-state falling threshold hysteresis
VHYS_TRI_ZCD#_F
-
450
-
VZCD_EN# = 5 V
-
-
100
VZCD_EN# = 0 V
-
-
-100
ZCD_EN# input current
IZCD_EN#
PS4 exit latency
tPS4EXIT
-
-
5
tPD_TRI_R
-
20
-
tTSHO
-
150
-
tPD_OFF_GH
-
20
-
-
15
-
V
mV
μA
μs
TIMING SPECIFICATIONS
Tri-state to GH/GL rising
propagation delay
Tri-state hold-off time
GH - turn off propagation delay
No load, see Fig. 4
GH - turn on propagation delay
(dead time rising)
tPD_ON_GH
GL - turn off propagation delay
tPD_OFF_GL
-
20
-
GL - turn on propagation delay
(dead time falling)
tPD_ON_GL
-
20
-
tPWM_ON_MIN.
30
-
-
PWM minimum on-time
ns
PROTECTION
Under voltage lockout
Under voltage lockout hysteresis
VUVLO
VCIN rising, on threshold
-
3.4
3.9
VCIN falling, off threshold
2.4
2.9
-
-
500
-
VUVLO_HYST
V
mV
Notes
(1) Typical limits are established by characterization and are not production tested
(2) Guaranteed by design
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
4
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
SiC634
www.vishay.com
Vishay Siliconix
DETAILED OPERATIONAL DESCRIPTION
PWM Input with Tri-State Function
Switch Node (VSWH and PHASE)
The PWM input receives the PWM control signal from the VR
controller IC. The PWM input is designed to be compatible
with standard controllers using two state logic (H and L) and
advanced controllers that incorporate tri-state logic (H, L
and tri-state) on the PWM output. For two state logic, the
PWM input operates as follows. When PWM is driven above
VPWM_TH_R the low-side is turned on and the high-side is
turned on. When PWM input is driven below VPWM_TH_F the
high-side is turned off and the low-side is turned on. For
tri-state logic, the PWM input operates as previously stated
for driving the MOSFETs when PWM is logic high and logic
low. However, there is an third state that is entered as the
PWM output of tri-state compatible controller enters its high
impedance state during shut-down. The high impedance
state of the controller’s PWM output allows the SiC634 to
pull the PWM input into the tri-state region (see definition of
PWM logic and tri-state, Fig. 4). If the PWM input stays in
this region for the tri-state hold-off period, tTSHO, both
high-side and low-side MOSFETs are turned off. The
function allows the VR phase to be disabled without
negative output voltage swing caused by inductor ringing
and saves a Schottky diode clamp. The PWM and tri-state
regions are separated by hysteresis to prevent false
triggering. The SiC634 incorporates PWM voltage
thresholds that are compatible with 5 V.
The switch node, VSWH, is the circuit power stage output.
This is the output applied to the power inductor and output
filter to deliver the output for the buck converter. The PHASE
pin is internally connected to the switch node VSWH. This pin
is to be used exclusively as the return pin for the BOOT
capacitor.
Diode Emulation Mode and PS4 Mode (ZCD_EN#)
The ZCD_EN# pin enables or disables diode emulation
mode. When ZCD_EN# is driven below VTH_ZCD_EN#_F, diode
emulation is allowed. When ZCD_EN# is driven above
VTH_ZCD_EN#_R, continuous conduction mode is forced.
Diode emulation mode allows for higher converter efficiency
under light load situations. With diode emulation active, the
SiC634 will detect the zero current crossing of the output
inductor and turn off the low-side MOSFET. This ensures
that discontinuous conduction mode (DCM) is achieved.
Diode emulation is asynchronous to the PWM signal,
therefore, the SiC634 will respond to the ZCD_EN# input
immediately after it changes state.
The ZCD_EN# pin can be floated resulting in a high
impedance state. High impedance on the input of ZCD_EN#
combined with a tri-stated PWM output will shut down the
SiC634, reducing current consumption to typically 5 μA.
This is an important feature in achieving the low standby
current requirements required in the PS4 state in ultrabooks
and notebooks.
Voltage Input (VIN)
This is the power input to the drain of the high-side power
MOSFET. This pin is connected to the high power
intermediate BUS rail.
Ground Connections (CGND and PGND)
PGND (power ground) should be externally connected
to CGND (control signal ground). The layout of the printed
circuit board should be such that the inductance separating
CGND and PGND is minimized. Transient differences due to
inductance effects between these two pins should not
exceed 0.5 V
Control and Drive Supply Voltage Input (VDRV, VCIN)
VCIN is the bias supply for the gate drive control IC. VDRV is
the bias supply for the gate drivers. It is recommended to
separate these pins through a resistor. This creates a low
pass filtering effect to avoid coupling of high frequency gate
drive noise into the IC.
Bootstrap Circuit (BOOT)
The internal bootstrap diode and an external bootstrap
capacitor form a charge pump that supplies voltage to the
BOOT pin. An integrated bootstrap diode is incorporated so
that only an external capacitor is necessary to complete the
bootstrap circuit. Connect a boot strap capacitor with one
leg tied to BOOT pin and the other tied to PHASE pin.
Shoot-Through Protection and Adaptive Dead Time
The SiC634 has an internal adaptive logic to avoid shoot
through and optimize dead time. The shoot through
protection ensures that both high-side and low-side
MOSFETs are not turned on at the same time. The adaptive
dead time control operates as follows. The high-side and
low-side gate voltages are monitored to prevent the one
turning on from tuning on until the other's gate voltage is
sufficiently low (< 1 V). Built in delays also ensure that one
power MOS is completely off, before the other can be turned
on. This feature helps to adjust dead time as gate transitions
change with respect to output current and temperature.
Under Voltage Lockout (UVLO)
During the start up cycle, the UVLO disables the gate
drive holding high-side and low-side MOSFET gates low
until the supply voltage rail has reached a point at which
the logic circuitry can be safely activated. The SiC634 also
incorporates logic to clamp the gate drive signals to zero
when the UVLO falling edge triggers the shutdown of the
device.
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
5
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
SiC634
www.vishay.com
Vishay Siliconix
FUNCTIONAL BLOCK DIAGRAM
BOOT
V IN
VDRV
VCIN
UVLO
ZCD_EN#
VCIN
PWM
PWM logic
control &
state
machine
Anti-cross
conduction
control
logic
+
GL
PHASE
VSWH
+
VDRV
CGND
GL
PGND
Fig. 3 - SiC634 Functional Block Diagram
DEVICE TRUTH TABLE
ZCD_EN#
PWM
GH
Tri-state
X
L
L
L
L
H, IL > 0 A
L, IL < 0 A
L
H
H
L
L
Tri-state
L
L
L
GL
H
L
L
H
H
H
H
L
H
Tri-state
L
L
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
6
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
SiC634
www.vishay.com
Vishay Siliconix
PWM TIMING DIAGRAM
VTH_PWM_R
VTH_TRI_F
VTH_TRI_R
VTH_PWM_F
PWM
t PD_OFF_GL
t TSHO
GL
t PD_ON_GL
t PD_TRI_R
t TSHO
t PD_ON_GH
t PD_OFF_GH
t PD_TRI_R
GH
Fig. 4 - Definition of PWM Logic and Tri-State
ZCD_EN# - PS4 EXIT TIMING
5V
PWM
tPS4EXIT
VSWH
5V
ZCD_EN#
2.5 V
Fig. 5 - ZCD_EN# - PS4 Exit Timing
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
7
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
SiC634
www.vishay.com
Vishay Siliconix
ELECTRICAL CHARACTERISTICS
Test condition: VIN = 13 V (unless otherwise stated), VDRV = VCIN = 5 V, ZCD_EN# = 5 V, VOUT = 1 V, LOUT = 250 nH (DCR = 0.32 m), TA = 25 °C,
natural convection cooling (All power loss and normalized power loss curves show SiC634 losses only unless otherwise stated)
94
60
90
55
50
500 kHz
750 kHz
82
Output Current, IOUT (A)
Efficiency (%)
86
1 MHz
78
74
70
500 kHz
40
1 MHz
35
30
25
Complete converter efficiency
PIN = [(VIN x IIN) + 5 V x (IVDRV + IVCIN)]
POUT = VOUT x IOUT, measured at output capacitor
66
45
20
15
62
0
5
10
15 20 25 30 35
Output Current, IOUT (A)
40
45
0
50
15
30
45 60 75 90 105 120 135 150
PCB Temperature, TPCB (°C)
Fig. 9 - Safe Operating Area (VIN = 12.6 V)
Fig. 6 - Efficiency vs. Output Current (VIN = 12.6 V)
16.0
5.0
4.5
14.0
4.0
12.0
Power Loss, PL (W)
Power Loss, PL (W)
IOUT = 25 A
3.5
3.0
2.5
1MHz
10.0
8.0
750 kHz
6.0
2.0
4.0
1.5
2.0
500 kHz
0.0
1.0
200
300
0
400 500 600 700 800 900 1000 1100
Switching Frequency, fS (kHz)
Fig. 7 - Power Loss vs. Switching Frequency (VIN = 12.6 V)
10
15 20 25 30 35
Output Current, IOUT (A)
40
45
50
Fig. 10 - Power Loss vs. Output Current (VIN = 12.6 V)
98
94
500 kHz
500 kHz
94
90
90
Efficiency (%)
86
86
Efficiency (%)
5
750 kHz
82
1 MHz
78
82
750 kHz
78
1 MHz
74
74
70
70
Complete converter efficiency
PIN = [(VIN x IIN) + 5 V x (IVDRV + IVCIN)]
POUT = VOUT x IOUT, measured at output capacitor
66
Complete converter efficiency
PIN = [(VIN x IIN) + 5 V x (IVDRV + IVCIN)]
POUT = VOUT x IOUT, measured at output capacitor
66
62
62
0
5
10
15 20 25 30 35
Output Current, IOUT (A)
40
45
50
Fig. 8 - Efficiency vs. Output Current (VIN = 9 V)
S20-0485-Rev. C, 29-Jun-2020
0
5
10
15 20 25 30 35
Output Current, IOUT (A)
40
45
50
Fig. 11 - Efficiency vs. Output Current (VIN = 19 V)
Document Number: 76784
8
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
SiC634
www.vishay.com
Vishay Siliconix
ELECTRICAL CHARACTERISTICS
4.2
0.80
4.0
0.75
BOOT Diode Forward Voltage, VF (V)
Control Logic Supply Voltage, VCIN (V)
Test condition: VIN = 13 V (unless otherwise stated), VDRV = VCIN = 5 V, ZCD_EN# = 5 V, VOUT = 1 V, LOUT = 250 nH (DCR = 0.32 m), TA = 25 °C,
natural convection cooling (All power loss and normalized power loss curves show SiC634 losses only unless otherwise stated)
3.8
3.6
VUVLO_RISING
3.4
3.2
VUVLO_FALLING
3.0
2.8
2.6
0
20
40
60
80
0.55
0.50
0.45
-60 -40 -20
0
40
60
80
100 120 140
Temperature (°C)
Fig. 12 - UVLO Threshold vs. Temperature
Fig. 15 - BOOT Diode Forward Voltage vs. Temperature
4.8
VTH_PWM_R
3.6
VTRI_TH_F
3.0
VTRI
1.8
VTRI_TH_R
1.2
VTH_PWM_F
0.6
0.0
4.2
VTH_ZCD_EN#_R
3.6
3.0
VTRI_ZCD_EN#_F
2.4
VTRI_ZCD_EN#_R
1.8
1.2
VTH_ZCD_EN#_F
0.6
0.0
-60 -40 -20
0
20
40
60
80
100 120 140
-60 -40 -20
0
Temperature (°C)
Fig. 13 - PWM Threshold vs. Temperature
20 40 60 80
Temperature (°C)
100 120 140
Fig. 16 - ZCD_EN# Threshold vs. Temperature
1.8
6.0
5.5
1.6
PS4 Mode Current, IVDRV & IVCIN (uA)
Normalized PS4 Exit Latency, tPS4EXIT
20
Temperature (°C)
ZCD_EN# Threshold Voltage, VZCD_EN# (V)
PWM Threshold Voltage, VPWM (V)
0.60
100 120 140
4.8
2.4
0.65
0.40
-60 -40 -20
4.2
IF = 2 mA
0.70
1.4
1.2
1.0
0.8
0.6
0.4
0.2
VPWM = VZCD_EN # = FLOAT
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
-60 -40 -20
0
20
40
60
80
100 120 140
-60 -40 -20
0
20
40
60
80
100 120 140
Temperature (°C)
Temperature (°C)
Fig. 14 - PS4 Exit Latency vs. Temperature
Fig. 17 - PS4 Mode Current vs. Temperature
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
9
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
SiC634
www.vishay.com
Vishay Siliconix
PCB LAYOUT RECOMMENDATIONS
Step 1: VIN/GND Planes and Decoupling
Step 3: VCIN/VDRV Input Filter
VSWH
P
G
N
D
PGND
CVDRV
CVCIN
VIN
CGND
VIN plane
PGND plane
1. Layout VIN and PGND planes as shown above
2. Ceramic capacitors should be placed directly between
VIN and PGND, and close to the device for best
decoupling effect
3. Different values / packages of ceramic capacitors should
be used to cover entire decoupling spectrum e.g. 1210,
0805, 0603, and 0402
4. Smaller capacitance values, closer to device VIN pin(s),
- results in better high frequency noise absorbing
Step 2: VSWH Plane
1. The VCIN/VDRV input filter ceramic capacitors should be
placed close to IC. It is recommended to connect two
caps separately
2. VCIN capacitor should be placed between pin 3 (VCIN)
and pin 4 (CGND of driver IC) to achieve best noise
filtering
3. VDRV capacitor should be placed between pin 28 (PGND
of driver IC) and pin 29 (VDRV) to provide maximum
instantaneous driver current for low-side MOSFET
during switching cycle
4. It is recommended to use a large plane analog ground,
CGND, plane to reduce parasitic inductance
VVSWH
SWH
Step 4: BOOT Resistor and Capacitor Placement
Snubber
Cboot
Rboot
PPGND
Plane
GND plane
1. Connect output inductor to DrMOS with large plane to
lower resistance
2. If a snubber network is required, place the components
as shown above, the network can be placed at bottom
1. The components should be placed close to IC, directly
between PHASE (pin 7) and BOOT (pin 5)
2. To reduce parasitic inductance, chip size 0402 can be
used
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
10
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
SiC634
www.vishay.com
Vishay Siliconix
Step 5: Signal Routing
1. Thermal relief vias can be added on the VIN and PGND
pads to utilize inner layers for high-current and thermal
dissipation
CGND
2. To achieve better thermal performance, additional vias
can be added to VIN and PGND planes
CGND
3. VSWH pad is a noise source and not recommended to put
vias on this plane
4. 8 mil vias for pads and 10 mils vias for planes are the
optimal via sizes. Vias on pads may drain solder during
assembly and cause assembly issue. Please consult
with the assembly house for guideline
Step 7: Ground Connection
CGND
PGND
VSWH
1. Route the PWM / ZCD_EN# signal traces out of the top
left corner, next to DrMOS pin 1
PGND
2. PWM is an important signal, both signal and return
traces should not cross any power nodes on any layer
3. It is best to “shield” traces form power switching nodes,
e.g. VSWH, to improve signal integrity
4. GL (pin 27) has been connected with GL pad internally
and does not need to connect externally
Step 6: Adding Thermal Relief Vias
1. It is recommended to make a single connection between
CGND and PGND, this connection can be done on top
layer
2. It is recommended to make the entire first inner layer
(next to top layer) a ground plane and separate it into
CGND and PGND plane
VSWH
3. These ground planes provide shielding between noise
sources on top layer and signal traces on bottom layer
CGND
PGND
VIN
PGND
plane
VIN plane
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
11
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
SiC634
www.vishay.com
Vishay Siliconix
Multi-Phases VRPower PCB Layout
The following is an example of 6 phase layout. As can be seen, all the VRPower stages are lined in X-direction compactly with
decoupling capacitors next to them. The inductors are placed as close as possible to the SiC634 to minimize the PCB copper
loss. Vias are applied on all PADs (VIN, PGND, CGND) of the SiC634 to ensure that both electrical and thermal performance are
optimized. Large copper planes are used for all high current loops, such as VIN, VSWH, VOUT and PGND. These copper planes are
duplicated in other layers to minimize the inductance and resistance. All the control signals are routed from the SiC634 to a
controller placed to the north of the power stage through inner layers to avoid the overlap of high current loops. This achieves
a compact design with the output from the inductors feeding a load located to the south of the design as shown in the figure.
VIN
PGND
VOUT
Fig. 18 - Multi-Phase VRPower Layout Top View
VIN
PGND
VOUT
Fig. 19 - Multi-Phase VRPower Layout Bottom View
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
12
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
SiC634
www.vishay.com
Vishay Siliconix
PRODUCT SUMMARY
Part number
SiC634
Description
50 A power stage, 4.5 VIN to 24 VIN, 5 V PWM with ZCD, PS4 mode
Input voltage min. (V)
4.5
Input voltage max. (V)
24
Continuous current rating max. (A)
50
Switch frequency max. (kHz)
Enable (yes / no)
Monitoring features
Protection
Light load mode
Pulse-width modulation (V)
Package type
Package size (W, L, H) (mm)
Status code
2000
No
UVLO, THDN
ZCD, PS4
5
PowerPAK MLP55-31L
5.0 x 5.0 x 0.75
2
Product type
VRPower (DrMOS)
Applications
Computer, industrial, networking
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon
Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package / tape drawings, part marking, and
reliability data, see www.vishay.com/ppg?76784.
S20-0485-Rev. C, 29-Jun-2020
Document Number: 76784
13
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
Package Information
www.vishay.com
Vishay Siliconix
PowerPAK® MLP55-31L Case Outline
K12
K1 D2- 1
E2- 2
L
15
C
9
K2
D2- 3
D2- 2
e2
Top view
DIM.
e1/3x
8
16
b1
31x
K6
K10
K3
E2- 3
0.10 M C A B
0.05 M C
1
e/25x
3
E
31
F3
b
31x
B
K8
K4
D2-4
23
MLP55-31L
(5 mm x 5 mm)
K13
8x
K5 E2- 1
24
E2-4
A2
0.10 C B
F2
F1
D
2x
D2-5
A1
0.10 C A
A
K7
A
2x
K11
0.08 C
0.10 C
5 6
Pin 1 dot
by marking
K9
e3
Bottom view
Side view
MILLIMETERS
INCHES
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
A
0.70
0.75
0.80
0.027
0.029
0.031
A1
0.00
-
0.05
0.000
-
0.002
A2
0.20 ref.
0.008 ref.
b
0.20
0.25
0.30
0.078
0.098
0.011
b1
0.15
0.20
0.25
0.006
0.008
0.010
D
4.90
5.00
5.10
0.193
0.196
0.200
e
0.50 BSC
0.019 BSC
e1
3.50 BSC
0.138 BSC
e2
1.50 BSC
0.060 BSC
e3
1.00 BSC
0.040 BSC
E
4.90
5.00
5.10
0.193
0.196
0.200
L
0.35
0.40
0.45
0.013
0.015
0.017
D2-1
0.98
1.03
1.08
0.039
0.041
0.043
D2-2
0.98
1.03
1.08
0.039
0.041
0.043
D2-3
1.87
1.92
1.97
0.074
0.076
0.078
D2-4
0.30 BSC
0.012 BSC
D2-5
1.05
1.10
1.15
0.041
0.043
0.045
E2-1
1.27
1.32
1.37
0.050
0.052
0.054
E2-2
1.93
1.98
2.03
0.076
0.078
0.080
E2-3
3.75
3.80
3.85
0.148
0.150
0.152
E2-4
F1
0.45 BSC
0.15
0.20
0.018 BSC
0.25
0.006
0.008
F2
0.20 ref.
0.008 ref.
F3
0.15 ref.
0.006 ref.
Revision: 21-Aug-17
0.010
Document Number: 64909
1
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
Package Information
www.vishay.com
DIM.
Vishay Siliconix
MILLIMETERS
MIN.
NOM.
INCHES
MAX.
MIN.
NOM.
K1
0.67 BSC
0.026 BSC
K2
0.22 BSC
0.008 BSC
K3
1.25 BSC
0.049 BSC
K4
0.10 BSC
0.004 BSC
K5
0.38 BSC
0.015 BSC
K6
0.12 BSC
0.005 BSC
K7
0.40 BSC
0.016 BSC
K8
0.40 BSC
0.016 BSC
K9
0.40 BSC
0.016 BSC
K10
0.85 BSC
0.033 BSC
K11
0.40 BSC
0.016 BSC
K12
0.40 BSC
0.016 BSC
K13
0.75 BSC
0.030 BSC
MAX.
ECN: T17-0423-Rev. F, 21-Aug-17
DWG: 6025
Notes
1. Use millimeters as the primary measurement
2. Dimensioning and tolerances conform to ASME Y14.5M. - 1994
3. Dimension b applies to plated terminal and is measured between 0.20 mm and 0.25 mm from terminal tip
4. The pin #1 identifier must be existed on the top surface of the package by using indentation mark or other feature of package body
5. Exact shape and size of this feature is optional
6. Package warpage max. 0.08 mm
7. Applied only for terminals
Revision: 21-Aug-17
Document Number: 64909
2
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
PAD Pattern
www.vishay.com
Vishay Siliconix
Recommended Land Pattern
PowerPAK® MLP55-31L
Top side transparent view
(not bottom view)
Land pattern for MLP55-31L
5
(D2-5)
1.05 24
1.35 0.57
1 24
0.5
31
0.3
0.33
0.75
(D2-1)
31 1.03
(D2-4)
3.4
0.33
1.42
0.35
(D2-2)
1.03
(D2-3)
1.92
15
(L)
0.4
3.05
0.07
2.15
2.08
8
16
0.18
0.65
9
(L)
0.4
0.3
3.5
0.4
2.02
1.75
0.58
16
23
1.15
0.3
0.35
9
0.5
0.35
0.65
0.5
15
0.75
0.3
8
0.5
(E2-3)
1.98
(b)
0.25
5
(E2-1)
4.2
(K2) 0.22
(K1) 0.67
1.13
0.3
1
0.35
0.15
(E3)
0.45
(E2-2)
1.32
0.5 (e)
23
1.6
0.85
0.75
(D3) 0.3
1
All dimensions in millimeters
24
31
1
23
33
Component for MLP55-31L
32
Land pattern for MLP55-31L
35
33
8
16
9
Revision: 18-Oct-2019
15
Document Number: 66944
1
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
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay's knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer's responsibility to validate that a particular product
with the properties described in the product specification is suitable for use in a particular application. Parameters provided in
datasheets and / or specifications may vary in different applications and performance may vary over time. All operating
parameters, including typical parameters, must be validated for each customer application by the customer's technical experts.
Product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited
to the warranty expressed therein.
Hyperlinks included in this datasheet may direct users to third-party websites. These links are provided as a convenience and
for informational purposes only. Inclusion of these hyperlinks does not constitute an endorsement or an approval by Vishay of
any of the products, services or opinions of the corporation, organization or individual associated with the third-party website.
Vishay disclaims any and all liability and bears no responsibility for the accuracy, legality or content of the third-party website
or for that of subsequent links.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk. Please
contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by
any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
© 2023 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 01-Jan-2023
1
Document Number: 91000
工商网监
湘ICP备2023018690号
