SIC779 Datasheet, PDF (1/17 Pages) Vishay Siliconix – Integrated DrMOS Power Stage

Integrated DrMOS Power Stage
SiC779
Vishay Siliconix
DESCRIPTION
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 V_core 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.
The SiC779 incorporates an advanced MOSFET gate driver
IC. This IC accepts a single PWM input from the V_R 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.
SiC779 APPLICATION DIAGRAM
5V
FEATURES
• Industry benchmark Gen III MOSFETs with
integrated Schottky diode
• DrMOS compliant gate driver IC
• Enables V_core switching at 1 MHz
• Easily achieve > 93 % efficiency in multi-phase,
low output voltage solutions
• 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
• 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
• 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
• Halogen-free according to IEC 61249-2-21 definition
• Compliant to RoHS Directive 2002/95/EC
APPLICATIONS
• CPU and GPU core voltage regulation
• Server, computer, workstation, game console, graphics
boards, PC
VIN
VCIN
SMOD
DSBL#
PWM
THDN
BOOT
V_SWH
VO
PHASE
SiC779CD
Figure 1
Document Number: 67538
www.vishay.com
S11-0703-Rev. B, 18-Apr-11
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