Data Sheet

April 2013
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FDMF6705B • Rev. 1.0.3
FDMF6705B - Extra-Small, High-Performance, High-Frequency DrMOS Module
FDMF6705B - Extra-Small, High-Performance, High-
Frequency DrMOS Module
Benefits
 Ultra-Compact 6x6 mm PQFN, 72% Space-Saving
Compared to Conventional Discrete Solutions
 Fully Optimized System Efficiency
 Clean Switching Waveforms with Minimal Ringing
 High-Current Handling
Features
 Over 93% Peak-Efficiency
 High-Current Handling of 40 A at 12 V
IN
 High-Current Handling of 38 A at 19 V
IN
 High-Performance PQFN Copper-Clip Package
 3-State 3.3 V PWM Input Driver
 Skip-Mode SMOD# (Low-Side Gate Turn-Off) Input
 Thermal Warning Flag for Over-Temperature
Condition
 Driver Output Disable Function (DISB# Pin)
 Internal Pull-Up and Pull-Down for SMOD# and
DISB# Inputs, Respectively
 Fairchild PowerTrench
®
Technology MOSFETs for
Clean Voltage Waveforms and Reduced Ringing
 Fairchild SyncFET™ (Integrated Schottky Diode)
Technology in the Low-Side MOSFET
 Integrated Bootstrap Schottky Diode
 Adaptive Gate Drive Timing for Shoot-Through
Protection
 Under-Voltage Lockout (UVLO)
 Optimized for Switching Frequencies up to 1 MHz
 Low-Profile SMD Package
 Fairchild Green Packaging and RoHS Compliance
 Based on the Intel
®
4.0 DrMOS Standard
Description
The XS™ DrMOS family is Fairchild’s next-generation,
fully optimized, ultra-compact, integrated MOSFET plus
driver power stage solution for high-current, high-
frequency, synchronous buck DC-DC applications. The
FDMF6705B integrates a driver IC, two power MOSFETs,
and a bootstrap Schottky diode into a thermally
enhanced, ultra-compact 6x6 mm PQFN package.
With an integrated approach, the complete switching
power stage is optimized with regards to driver and
MOSFET dynamic performance, system inductance,
and power MOSFET R
DS(ON).
XS™ DrMOS uses
Fairchild's high-performance PowerTrench
®
MOSFET
technology, which dramatically reduces switch ringing,
eliminating the need for a snubber circuit in most buck
converter applications.
A new driver IC with reduced dead times and
propagation delays further enhances the performance of
this part. A thermal warning function warns of a potential
over-temperature situation. The FDMF6705B also
incorporates features, such as Skip Mode (SMOD), for
improved light-load efficiency, along with a three-state
3.3 V PWM input for compatibility with a wide range of
PWM controllers.
Applications

High-Performance Gaming Motherboards
 Notebook Computers, V-Core and Non-V-Core
 Compact Blade Servers, V-Core and Non-V-Core
DC-DC Converters
 Desktop Computers, V-Core and Non-V-Core
DC-DC Converters
 Workstations
 High-Current DC-DC Point-of-Load (POL)
Converters
 Small Form-Factor Voltage Regulator Modules
Ordering Information
Part Number Current Rating Package Top Mark
FDMF6705B 40 A 40-Lead, Clipbond PQFN DrMOS, 6.0x6.0 mm Package FDMF6705B