www.vishay.com
SiC471, SiC472, SiC473, SiC474
Vishay Siliconix
4.5 V to 55 V Input, 3 A, 5 A, 8 A, 12 A
microBUCK® DC/DC Converter
DESCRIPTION
The SiC47x is a family of wide input voltage, high efficiency
synchronous buck regulators with integrated high side
and low side power MOSFETs. Its power stage is capable
of supplying high continuous current at up to 2 MHz
switching frequency. This regulator produces an adjustable
output voltage down to 0.8 V from 4.5 V to 55 V input
rail to accommodate a variety of applications, including
computing, consumer electronics, telecom, and industrial.
SiC47x’s architecture allows for ultrafast transient response
with minimum output capacitance and tight ripple regulation
at very light load. The device enables loop stability
regardless of the type of output capacitor used, including
low ESR ceramic capacitors. The device also incorporates a
power saving scheme that significantly increases light load
efficiency. The regulator integrates a full protection feature
set, including over current protection (OCP), output
overvoltage protection (OVP), short circuit protection (SCP),
output undervoltage protection (UVP) and over temperature
protection (OTP). It also has UVLO for input rail and a user
programmable soft start.
The SiC47x family is available in 3 A, 5 A, 8 A, 12 A pin
compatible 5 mm by 5 mm lead (Pb)-free power enhanced
MLP55-27L package.
TYPICAL APPLICATION CIRCUIT
INPUT
4.5 VDC to 55 VDC
CIN
Css
VCIN
V IN
V DD
V DRV
MODE
SS
ILIMIT
PHASE
SW
SiC47x
V SNS
ULTRASONIC
V FB
COMP
Rlimit
Rfsw
CBOOT
Rx
Cy
Rcomp
Ccomp
V OUT
Cx
Rup
Rdown
COUT
Fig. 1 - Typical Application Circuit for SiC47x
FEATURES
• Versatile
- Single supply operation from 4.5 V to 55 V
input voltage
- Adjustable output voltage down to 0.8 V
- Scalable solution 3 A (SiC474), 5 A (SiC473),
8 A (SiC472), 12 A (SiC471)
- Output voltage tracking and sequencing with
pre-bias start up
- ± 1 % output voltage accuracy at -40 °C to +125 °C
• Highly efficient
- 98 % peak efficiency
- 4 μA supply current at shutdown
- 235 μA operating current, not switching
• Highly configurable
- Adjustable switching frequency from 100 kHz to 2 MHz
- Adjustable soft start and adjustable current limit
- 3 modes of operation, forced continuous conduction,
power save or ultrasonic
• Robust and reliable
- Output over voltage protection
- Output under voltage / short circuit protection with auto
retry
- Power good flag and over temperature protection
- Supported by Vishay PowerCAD online design
simulation
• Design support tools
- PowerCAD online design simulation (vishay.transim.com)
- External component calculator (www.vishay.com/doc?75760)
- Schematic, design, BOM, and gerber files
(www.vishay.com/doc?75763)
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• Industrial and automation
• Home automation
• Industrial and server computing
• Networking, telecom, and base station power supplies
• Unregulated wall transformer
• Robotics
• High end hobby electronics: remote control cars, planes,
and drones
• Battery management systems
• Power tools
• Vending, ATM, and slot machines
Axis Title
100 10000
VIN = 24 V, VOUT = 12 V
98
96
94 1000
92
VIN = 48 V, VOUT = 12 V
90
88 VIN = 24 V, VOUT = 5 V
86 100
84
VIN = 48 V, VOUT = 5 V
82
80 10
012345678
IOUT - Output Current (A)
Fig. 2 - SiC472 Efficiency vs. Output Current
S19-0648-Rev. D, 29-Jul-2019
1
Document Number: 75786
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
