SiC645
www.vishay.com
Vishay Siliconix
S16-2233-Rev. B, 31-Oct-16
1
Document Number: 65424
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
60 A VRPower
®
Smart Power Stage (SPS) Module with Integrated
High-Accuracy Current and Temperature Monitors
DESCRIPTION
The SiC645 is a smart VRPower
®
device that integrates a
high side and low side MOSFET, a high performance driver
with integrated bootstrap FET. The SiC645 offers high
accuracy current and temperature monitors that can be fed
back to the controller and doubler to complete a multiphase
DC/DC system. They simplify design and increase
performance by eliminating the DCR sensing network and
associated thermal compensation. Light-load efficiency is
supported via a dedicated left control pin. An industry
leading thermally enhanced dual cooled, 5 mm x 5 mm
PowerPAK
®
MLP package allows minimal overall PCB real
estate and low-profile construction.
The devices feature a 3.3 V (SiC645A) or 5 V (SiC645)
compatible tri-state PWM input that, working together with
multiphase PWM controllers, will provide a robustsolution in
the event of abnormal operating conditions. The SiC645
also improves system performance and reliability with
integrated fault protection of UVLO, over-temperature and
over-current. An open-drain fault reporting pin simplifies the
handshake between the smart VRPower device and
multiphase controllers and can be used to disable the
controller during start-up and fault conditions.
FEATURES
• Input range: 4.5 V to 18 V
• Supports 60 A DC current
• Compatible with 3.3 V (SiC645A) and 5 V
(SiC645) tri-state PWM
• Down slope current sensing
• ± 3 % accuracy current monitor (IMON) with REF
IN
input
• 8 mV/°C temperature monitor with OT flag
• Dedicated low-side FET control input
• Fault protection
- High-side FET short and over-current protection
- Over-temperature protection
- V
CC
and V
IN
under voltage lockout (UVLO)
• Open drain fault reporting output
• Up to 2 MHz switching frequency
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• High frequency and high efficiency VRM and VRD
• Core, graphic, and memory regulators for microprocessors
• High density VR for server, networking, and cloud computing
• POL DC/DC converters and video gaming consoles
TYPICAL APPLICATION DIAGRAM
Fig. 1 - SiC645 Typical Application Block Diagram
Multiphase
controller
PHASE
BOOT
+5 V
EN
TMON
Shoot-
through
protection
Smart
control
V
CC
PV
CC
PV
CC
GND
V
IN
+12 V
GND
L
OUT
IMON
REF
IN
CS#n
CSRTN#n
PWM
PWM
TEMP
FAULT#
LGCTRL
C
OUT
V
OUT
SW
V
CC
SiC645
GND
