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Vishay Intertechnology Electronic Components Datasheet

SiC473 Datasheet

DC/DC Converter

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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


Vishay Intertechnology Electronic Components Datasheet

SiC473 Datasheet

DC/DC Converter

No Preview Available !

www.vishay.com
PIN CONFIGURATION
SiC471, SiC472, SiC473, SiC474
Vishay Siliconix
VCIN 1
PGOOD 2
EN 3
BOOT 4
PHASE 5
PHASE 6
28 AGND
IJ
30
VIN 29 PGND
ķ
19 SS
18 ULTRASONIC
17 PGND
16 VDRV
15 GL
14 SW
13 SW
12 SW
SS 19
ULTRASONIC 18
PGND 17
VDRV 16
GL 15
SW 14
SW 13
SW 12
28 AGND
30 PGND
ķ
29
VIN
1 VCIN
2 PGOOD
3 EN
4 BOOT
5 PHASE
6 PHASE
Fig. 3 - SiC47x Pin Configuration
PIN DESCRIPTION
PIN NUMBER
SYMBOL
1 VCIN
2 PGOOD
3
4
5, 6
7, 8, 29
9, 10, 11, 17, 30
12, 13, 14
15
16
EN
BOOT
PHASE
VIN
PGND
SW
GL
VDRV
18 ULTRASONIC
19
20
21
22
23, 28
24
25
26
27
SS
VSNS
COMP
VFB
AGND
fSW
ILIMIT
VDD
MODE
DESCRIPTION
Supply voltage for internal regulators VDD and VDRV. This pin should be tied to VIN, but can also be
connected to a lower supply voltage (> 5 V) to reduce losses in the internal linear regulators
Open-drain power good indicator - high impedance indicates power is good. An external pull-up
resistor is required
Enable pin. Tie high/low to enable/disable the IC accordingly. This is a high voltage compatible pin,
can be tied to VIN
High side driver bootstrap voltage
Return path of high side gate driver
Power stage input voltage. Drain of high side MOSFET
Power ground
Power stage switch node
Low side MOSFET gate signal
Supply voltage for internal gate driver. When using the internal LDO as a bias power supply, VDRV is
the LDO output. Connect a 4.7 μF decoupling capacitor to PGND
Float to disable ultrasonic mode, connect to VDD to enable. Depending on the operation mode set by
the mode pin, power save mode or forced continuous mode will be enabled when the ultrasonic
mode is disabled
Set the soft start ramp by connecting a capacitor to AGND. An internal current source will charge the
capacitor
Power inductor signal feedback pin for system stability compensation
Output of the internal error amplifier. The feedback loop compensation network is connected from
this pin to the AGND pin
Feedback input for switching regulator used to program the output voltage - connect to an external
resistor divider from VOUT to AGND
Analog ground
Set the on-time by connecting a resistor to AGND
Set the current limit by connecting a resistor to AGND
Bias supply for the IC. VDD is an LDO output, connect a 1 μF decoupling capacitor to AGND
Set various operation modes by connecting a resistor to AGND. See specification table for details
S19-0648-Rev. D, 29-Jul-2019
2
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


Part Number SiC473
Description DC/DC Converter
Maker Vishay
PDF Download

SiC473 Datasheet PDF






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