The Vishay Siliconix SiC414 and SiC424 are an advanced
stand-alone synchronous buck regulator featuring
integrated power MOSFETs, bootstrap switch, and an
internal 5 V
LDO
in a space-saving PowerPAK MLP44-28L
package.
The SiC414 and SiC424 are capable of operating with all
ceramic solutions and switching frequencies up to 1 MHz.
The programmable frequency, synchronous operation and
selectable power-save allow operation at high efficiency
across the full range of load current. The internal LDO may
be used to supply 5 V for the gate drive circuits or it may be
bypassed with an external 5 V for optimum efficiency and
used to drive external n-channel MOSFETs or other loads.
Additional features include cycle-by-cycle current limit,
voltage soft-start, under-voltage protection, programmable
over-current protection, soft shutdown, and selectable
power-save. The Vishay Siliconix SiC414 and SiC424 also
provides an enable input and a power good output.
FEATURES
• High efficiency > 95 %
• 6 A continuous output current capability
• Integrated bootstrap switch
• Integrated 5 V / 200 mA LDO with bypass logic
• Temperature compensated current limit
• Pseudo fixed-frequency adaptive on-time control
• All ceramic solution enabled
• Programmable input UVLO threshold
• Independent enable pin for switcher and LDO
• Selectable ultrasonic power-save mode (SiC414)
• Selectable power-save mode (SiC424)
• Internal soft-start and soft-shutdown
• 1 % internal reference voltage
• Power good output and over voltage protection
• PowerCAD Simulation software available at
www.vishay.com/power-ics/powercad-list/
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
PRODUCT SUMMARY
INPUT VOLTAGE RANGE
Output Voltage Range
Operating Frequency
Continuous Output Current
Peak Efficiency
Package
3 V to 28 V
0.75 V to 5.5 V
200 kHz to 1 MHz
6A
95 %
PowerPAK MLP44-28L
APPLICATIONS
• Notebook, desktop, and server computers
• Digital HDTV and digital consumer applications
• Networking and telecommunication equipment
• Printers, DSL, and STB applications
• Embedded applications
• Point of load power supplies
TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTION
LDO_EN
V
OUT
P
GOOD
EN/PSV (Tri-State)
3.3 V
28 27 26 25 24
TON
ENL
A
GND
EN/PSV
LX
1 FB
23 22
P
GOOD
I
LIM
V
OUT
LX 21
LX 20
P
GND
19
2 V5V
3 A
GND
V
IN
4 V
OUT
5 V
IN
6 V
LDO
PAD1
A
GND
PAD3
LX
PAD2
V
IN
P
GND
P
GND
18
P
GND
17
P
GND
16
P
GND
V
IN
V
IN
V
IN
V
IN
8
9
10 11 12
LX
7 BST
LX 15
13 14
S16-0640-Rev. C, 11-Apr-16
Document Number: 63388
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
SiC414, SiC424
www.vishay.com
PIN CONFIGURATION
(top view)
EN/PSV
TON
ENL
A
GND
I
LIM
P
GOOD
Vishay Siliconix
28 27 26 25
FB
V5V
A
GND
V
OUT
V
IN
V
LDO
BST
1
2
3
4
5
6
7
10
11
PAD2
V
IN
PAD1
A
GND
24 23 22
21
20
PAD3
LX
19
18
17
16
15
12
13
14
LX
LX
P
GND
P
GND
P
GND
P
GND
LX
8
V
IN
V
IN
9
V
IN
V
IN
LX
P
GND
PIN DESCRIPTION
PIN NUMBER
1
2
3, 26, PAD 1
4
5, 8 to 11, PAD 2
6
7
12
15, 20, 21, PAD 3
13, 14, 16 to 19
22
23
24
25
27
28
SYMBOL
FB
V5V
A
GND
V
OUT
V
IN
V
LDO
BST
LXBST
LX
P
GND
P
GOOD
I
LIM
LXS
EN / PSV
t
ON
ENL
DESCRIPTION
Feedback input for switching regulator used to program the output voltage - connect to an external
resistor divider from V
OUT
to A
GND
.
Bias input for internal analog circuits and gate drives - connect to external 3 V or 5 V supply or bias
connection to V
LDO
.
Analog ground.
Switcher output voltage sense pin, and also the input to the internal switch-over between V
OUT
and V
LDO
.
Input supply voltage.
5 V LDO output.
Bootstrap pin - connect a capacitor from BST to LXBST to develop the floating supply for the high-side
gate drive.
LX Boost - connect to the BST capacitor.
Switching (Phase) node.
Power ground.
Open-drain power good indicator. High impedance indicates power is good. An external pull-up resistor
is required.
Current limit sense pin - used to program the current limit by connecting a resistor from I
LIM
to LXS.
LX sense - connect to R
ILIM
resistor.
Enable / power save input for the switching regulator - connect to A
GND
to disable the switching regulator.
Float to operate in forced continuous mode (power save disabled).
For SiC414, connect to V5V to operate with ultrasonic power save mode enabled.
For SiC424, connect to V5V to operate with power save mode enabled with no minimum frequency.
On-time programming input - set the on-time by connecting through a resistor to A
GND
.
Enable input for the LDO - connect ENL to A
GND
to disable the LDO. Drive with logic to +3 V for logic
control, or program the V
IN
UVLO with a resistor divider between V
IN
, ENL, and A
GND
.
ORDERING INFORMATION
PART NUMBER
SiC414CD-T1-GE3
SiC424CD-T1-GE3
SiC414DB
PACKAGE
PowerPAK MLP44-28
PowerPAK MLP44-28
Reference board
S16-0640-Rev. C, 11-Apr-16
Document Number: 63388
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
P
GND
LX
SiC414, SiC424
www.vishay.com
FUNCTIONAL BLOCK DIAGRAM
2
V5V
V5V
22
P
GOOD
25
EN/PSV
5, 8 to 11, PAD2
V
IN
V
IN
Vishay Siliconix
A
GND
3, 26, PAD1
Reference
Control and Status
V5V
DL
BST
7
Soft Start
LX
12, 15, 20, 21,
24 PAD3
V5V
P
GND
Zero Cross
Detector
Bypass Comparator
V
LDO
6
Y
A
B
MUX
V
IN
LDO
ENL
Valley1-Limit
13, 14, 16 to 19
I
LIM
23
FB
1
TON
27
V
OUT
4
+
-
FB Comparator
On-Time
Generator
Gate Drive
Control
28
ABSOLUTE MAXIMUM RATINGS
(T
A
= 25 °C, unless otherwise noted)
ELECTRICAL PARAMETER
V
IN
LX
LX (transient < 100 ns)
EN / PSV, P
GOOD
, I
LIM
V
OUT
, V
LDO
, FB
V5V
t
ON
BST
ENL
A
GND
to P
GND
Temperature
Maximum Junction Temperature
Storage Temperature
Power Dissipation
Junction to Ambient Thermal Impedance (R
thJA
)
b
Maximum Power Dissipation
ESD Protection
HBM
2
kV
IC Section
Ambient temperature = 25 °C
Ambient temperature = 100 °C
43
3.4
1.3
°C/W
W
150
-65 to +150
°C
CONDITIONS
to P
GND
to P
GND
to P
GND
to GND
to GND
to P
GND
to P
GND
to LX
to P
GND
LIMITS
-0.3 to +30
-0.3 to +30
-2 to +30
-0.3 to +(V5V + 0.3)
-0.3 to +(V5V + 0.3)
-0.3 to +6
-0.3 to +(V5V - 1.5)
-0.3 to +6
-0.3 to +35
-0.3 to V
IN
-0.3 to +0.3
V
UNIT
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.
S16-0640-Rev. C, 11-Apr-16
Document Number: 63388
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
SiC414, SiC424
www.vishay.com
Vishay Siliconix
RECOMMENDED OPERATING RANGE
(all voltages referenced to GND = 0 V)
PARAMETER
V
IN
V5V to P
GND
V
OUT
to P
GND
Temperature
Recommended Ambient Temperature
-40 to +85
°C
Note
• For proper operation, the device should be used within the recommended conditions.
MIN.
3
3
0.75
TYP.
-
-
-
MAX.
28
5.5
5.5
V
UNIT
ELECTRICAL SPECIFICATIONS
PARAMETER
Input Supplies
V
IN
UVLO Threshold Voltage
a
(not available for V5V < 4.5 V)
V
IN
UVLO Hysteresis
V5V UVLO Threshold Voltage
V
DD
UVLO Hysteresis
V
IN
Supply Current
V
UVLO
V
UVLO_HYS
V
UVLO
V
UVLO_HYS
EN / PSV, ENL = 0 V, V
IN
= 28 V
I
IN
Standby mode:
ENL = V5V, EN / PSV = 0 V
EN / PSV, ENL = 0 V, V5V = 5 V
EN / PSV, ENL = 0 V, V5V = 3 V
SiC414, EN/PSV = V5V, no load,
(f
sw
= 25 kHz), V
FB
> 0.75 V
b
V5V Supply Current
I
DD
SiC424, EN/PSV = V5V, no load,
V
FB
> 0.75 V
b
V5V = 5 V, f
sw
= 250 kHz,
EN / PSV = floating, no load
b
V5V = 5 V, f
sw
= 250 kHz,
EN / PSV = floating, no load
b
Controller
FB Comparator Threshold
b
SYMBOL
TEST CONDITIONS UNLESS SPECIFIED
V
IN
= 12 V, V5V = 5 V, T
A
= +25 °C for typ.,
-40 °C to +85 °C for min. and max.,
T
J
= < 125 °C
Sensed at ENL pin, rising edge
Sensed at ENL pin, falling edge
Measured at V
DD
pin, rising edge
Measured at V
DD
pin, falling edge
MIN.
TYP.
MAX.
UNIT
2.4
2.23
-
2.5
2.4
-
-
-
-
-
-
-
-
-
2.6
2.4
0.2
2.9
2.7
0.2
8.5
130
3
2
1
0.4
4
2.5
2.95
2.57
-
3.0
2.9
-
20
-
7
-
-
-
mA
-
-
μA
V
V
FB
f
sw
Static V
IN
and load, -40 °C to +85 °C,
V5V = 3 V or 5 V
Continuous mode
Minimum f
SW
, (SiC414 only),
EN/PSV= V5V, no load
0.7425 0.7500 0.7575
200
-
-
-
25
10
1000
-
-
V
Frequency Range
kHz
Bootstrap Switch Resistance
Timing
On-Time
Minimum On-Time
b
Minimum Off-Time
b
Soft Start
Soft Start Time
b
Analog Inputs/Outputs
VOUT Input Resistance
Current Sense
Zero-Crossing Detector Threshold Voltage
S16-0640-Rev. C, 11-Apr-16
V
Sense-th
LX-P
GND
R
O-IN
t
SS
t
ON
t
ON, min.
t
OFF, min.
V5V = 5 V
V5V = 3 V
Continuous mode operation V
IN
= 15 V,
V
OUT
= 3 V, f
SW
= 300 kHz, R
ton
= 133 k
1350
-
-
-
-
-
-3
1500
80
320
390
1.7
500
0
1650
-
-
-
-
-
+3
ms
k
mV
ns
Document Number: 63388
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
SiC414, SiC424
www.vishay.com
Vishay Siliconix
TEST CONDITIONS UNLESS SPECIFIED
V
IN
= 12 V, V5V = 5 V, T
A
= +25 °C for typ.,
-40 °C to +85 °C for min. and max.,
T
J
= < 125 °C
Upper limit,
V
FB
> internal reference 750 mV
Lower limit,
V
FB
< internal reference 750 mV
V5V = 5 V
V5V = 3 V
ELECTRICAL SPECIFICATIONS
PARAMETER
Power Good
-
-
-
-
-
-
-
V5V = 5 V, R
ILIM
= 5 k
I
LIM
V
ILM-LK
V
OUV_Fault
P
SAVE_VTH
With respect to A
GND
V
FB
with respect to Internal 750 mV
reference, 8 consecutive clocks
V
FB
with respect to internal 750 mV
reference
V
FB
with respect to internal 750 mV
reference
t
OV-Delay
b
SYMBOL
MIN.
TYP.
MAX.
UNIT
+20
-10
4
2
5
-
10
4
8
0
-25
+10
+20
5
150
-
-
-
-
-
-
11
-
5
115
200
-
-
2
1.2
-
%
-
-
-
-
1
-
5
-
+8
-
-
-
-
-
-
0.4
100
%
42
0.4
+10
18
+1
5.1
-
-
+140
+450
-
-
V
mA
mV
V
μA
V
μs
°C
%
ms
μs
μA
A
μA
mV
Power Good Threshold Voltage
PG_
VTH_UPPER
Start-Up Delay Time
(between PWM enable and P
GOOD
high)
Fault (noise-immunity) Delay Time
b
Power Good Leakage Current
Power Good On-Resistance
Fault Protection
Valley Current Limit
I
LIM
Source Current
I
LIM
Comparator Offset Voltage
Output Under-Voltage Fault
Smart Power-Save Protection
Threshold Voltage
b
Over-Voltage Protection Threshold
Over-Voltage Fault Delay
b
Over Temperature Shutdown
Logic Inputs / Outputs
Logic Input High Voltage
Logic Input Low Voltage
EN / PSV
Input for PSAVE Operation
b
EN / PSV
Input for Forced Continuous Operation
b
EN / PSV Input for Disabling Switcher
EN / PSV Input Bias Current
ENL Input Bias Current
FB Input Bias Current
Linear Dropout Regulator
V
LDO
Accuracy
LDO Current Limit
V
LDO
to V
OUT
Switch-Over Threshold
c
V
LDO
to V
OUT
Non-Switch-Over Threshold
c
V
LDO
to V
OUT
Switch-Over Resistance
LDO Drop Out Voltage
d
PG_T
d
PG_I
CC
PG_I
LK
PG_R
DS-ON
3
-
-8
-
-
-
-
T
Shut
V
IH
V
IL
10 °C hysteresis
-
1
-
45
ENL
V
% of V5V
1V
0
I
EN
FBL_I
LK
V
LDO_ACC
LDO_I
LIM
V
LDO-BPS
V
LDO-NBPS
R
LDO
V
OUT
= 5 V
From V
IN
to V
VLDO
, V
VLDO
= 5 V,
I
VLDO
= 100 mA
EN / PSV = V5V or A
GND
V
IN
= 28 V
FB = V5V or A
GND
V
LDO
load = 10 mA
Start-up and foldback, V
IN
= 12 V
Operating current limit, V
IN
= 12 V
-10
-
-1
4.9
-
135
-140
-450
-
-
Notes
a. V
IN UVLO
is programmable using a resistor divider from V
IN
to ENL to A
GND
. The ENL voltage is compared to an internal reference.
b. Guaranteed by design.
c. The switch-over threshold is the maximum voltage differential between the V
LDO
and V
OUT
pins which ensures that V
LDO
will internally
switch-over to V
OUT
. The non-switch-over threshold is the minimum voltage differential between the V
LDO
and V
OUT
pins which ensures that
V
LDO
will not switch-over to V
OUT
d. The LDO drop out voltage is the voltage at which the LDO output drops 2 % below the nominal regulation point.
S16-0640-Rev. C, 11-Apr-16
Document Number: 63388
5
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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