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FDMF6704V
XS?DrMOS
August 2009
FDMF6704V - XSTM DrMOS
The Xtra Small, High Performance, High Frequency DrMOS Module with LDO
Benefits Single 12 V power supply operation. Ultra compact size - 6 mm x 6 mm MLP, 44 % space
saving compared to conventional MLP 8 mm x 8 mm
DrMOS packages. Ultra compact thermally enhanced 6 mm x 6 mm MLP
package 84 % smaller than conventional discrete solutions. Fully optimized system efficiency. Clean voltage waveforms with reduced ringing. High frequency operation. Compatible with a wide variety of PWM controllers in the
market. Single input voltage operation.
Features Internal 12 V to 5 V regulator. Synchronous driver plus FET multichip module. High current handling of 35 A. Over 93 % peak efficiency. Tri-State PWM input. Fairchild's PowerTrench® 5 technology MOSFETs for clean
voltage waveforms and reduced ringing. Optimized for high switching frequencies of up to 1 MHz. Skip mode SMOD [low side gate turn off] input. Fairchild SyncFETTM [integrated Schottky diode] technology
in the low side MOSFET. Integrated bootstrap Schottky diode. Adaptive gate drive timing for shoot-through protection. Driver output disable function [DISB# pin]. Undervoltage lockout (UVLO). Fairchild Green Packaging and RoHS
compliant. Low profile SMD package.
General DescriptionThe XSTM DrMOS family is Fairchild’s next-generation fully-
optimized, ultra-compact, integrated MOSFET plus driver power
stage solutions for high current, high frequency synchronous
buck DC-DC applications. The FDMF6704V XSTM DrMOS
integrates a driver IC, two power MOSFETs and a bootstrap
Schottky diode along with an integrated 5 V gate drive LDO
regulator into a thermally enhanced, ultra compact 6 mm x 6
mm MLP package. With an integrated approach, the complete
switching power stage is optimized with regards to driver and
MOSFET dynamic performance, system inductance and
RDS(ON). This greatly reduces the package parasitics and layout
challenges associated with conventional discrete solutions.TM DrMOS uses Fairchild's high performance
PowerTrenchTM 5 MOSFET technology, which dramatically
reduces ringing in synchronous buck converter applications.
PowerTrenchTM 5 can eliminate the need for a snubber circuit in
buck converter applications. The driver IC incorporates
advanced features such as SMOD for improved light load
efficiency and a Tri-State PWM input for compatibility with a
wide range of PWM controllers. A 5 V gate drive and an
improved PCB interface, optimized for a maximum low side FET
exposed pad area, ensure higher performance. This product is
compatible with the new Intel 6 mm x 6 mm DrMOS
specification.
Applications Compact blade servers V-core, non V-core and VTT DC-DC
converters. Desktop computers V-core, non V-core and VTT DC-DC
converters. Workstations V-core, non V-core and VTT DC-DC
converters. Gaming Motherboards V-core, non V-core and VTT DC-DC
converters. Gaming consoles. High-current DC-DC Point of Load (POL) converters. Networking and telecom microprocessor voltage regulators.
Power Train Application CircuitFigure 1. Power Train Application Circuit
DISB#
PWM
CGND PGND
VDRV VIN
BOOT
VSWH
DISB#
PWM Input
CVIN
CBOOT
COUT
OUTPUT VCIN
VCIN
CVDRV
SMOD#ON
OFF PHASE
Ordering InformationVDRV
VIN
LOUT
RBOOT
