SiC779
Vishay Siliconix
Integrated DrMOS Power Stage
FEATURES
DESCRIPTION
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Industry benchmark Gen III MOSFETs with
The SiC779 is an integrated solution that contains PWM
optimized n-channel MOSFETs (high side and low side) and
a full featured MOSFET driver IC. The device complies with
the Intel DrMOS standard for desktop and server Vcore power
stages. The SiC779 delivers up to 40 A continuous output
current and operates from an input voltage range of 3 V to
16 V. The integrated MOSFETs are optimized for output
voltages in the ranges of 0.8 V to 2.0 V with a nominal input
voltage of 12 V. The device can also deliver very high power
at 5 V output for ASIC applications.
integrated Schottky diode
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DrMOS compliant gate driver IC
Enables Vcore switching at 1 MHz
Easily achieve > 93 % efficiency in multi-phase,
low output voltage solutions
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Low ringing on the VSWH pin reduces EMI
Pin compatible with DrMOS 6 x 6 version 4.0
Tri-state PWM input function prevents negative output
voltage swing
The SiC779 incorporates an advanced MOSFET gate driver
IC. This IC accepts a single PWM input from the VR controller
and converts it into the high side and low side MOSFET gate
drive signals. The driver IC is designed to implement the skip
mode (SMOD) function for light load efficiency improvement.
Adaptive dead time control also works to improve efficiency
at all load points. The SiC779 has a thermal warning (THDN)
that alerts the system of excessive junction temperature. The
driver IC includes an enable pin, UVLO and shoot through
protection.
The SiC779 is optimized for high frequency buck
applications. Operating frequencies in excess of 1 MHz can
easily be achieved.
The SiC779 is packaged in Vishay Siliconix high
performance PowerPAK MLP 6 x 6 package. Compact
co-packaging of components helps to reduce stray
inductance, and hence increases efficiency.
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5 V logic levels on PWM
MOSFET threshold voltage optimized for 5 V driver bias
supply
Automatic skip mode operation (SMOD) for light load
efficiency
Under-voltage lockout
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Built-in bootstrap schottky diode
Adaptive deadtime and shoot through protection
Thermal shutdown warning flag
Low profile, thermally enhanced PowerPAK® MLP 6 x 6
40 pin package
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Halogen-free according to IEC 61249-2-21 definition
• Compliant to RoHS Directive 2002/95/EC
APPLICATIONS
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CPU and GPU core voltage regulation
Server, computer, workstation, game console, graphics
boards, PC
SiC779 APPLICATION DIAGRAM
5 V
V
IN
V
CIN
SMOD
DSBL#
PWM
BOOT
V
SWH
V
O
PHASE
THDN
SiC779CD
Figure 1
Document Number: 67538
S11-0703-Rev. B, 18-Apr-11
www.vishay.com
1
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