March 2011
FDMF6705 – XS™ DrMOS — Extra-Small, High-
Performance, High-Frequency DrMOS Module
Benefits
Description
The XS™ DrMOS family is Fairchild’s nextꢀgeneration,
fully optimized, ultraꢀcompact, integrated MOSFET plus
driver power stage solutions for highꢀcurrent, highꢀ
frequency, synchronous buck DCꢀDC applications. The
FDMF6705 integrates a driver IC, two power MOSFETs,
and a bootstrap Schottky diode into a thermally
enhanced, ultraꢀcompact 6x6mm PQFN package.
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UltraꢀCompact 6x6mm PQFN, 72% SpaceꢀSaving
Compared to Conventional Discrete Solutions
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Fully Optimized System Efficiency
Clean Switching Waveforms with Minimal Ringing
HighꢀCurrent Handling
With an integrated approach, the complete switching
power stage is optimized with regards to driver and
MOSFET dynamic performance, system inductance,
and Power MOSFET RDS(ON). XS™ DrMOS uses
Fairchild's highꢀperformance PowerTrench® MOSFET
technology, which dramatically reduces switch ringing,
eliminating the need for a snubber circuit in most buck
converter applications.
Features
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Over 93% PeakꢀEfficiency
HighꢀCurrent Handling of 43A
HighꢀPerformance PQFN Copper Clip Package
3ꢀState 5V PWM Input Driver
Shorter Propagation Delays than FDMF6704
Shorter Dead Times than FDMF6704
SkipꢀMode SMOD# (LowꢀSide Gate Turn Off) Input
A
new driver IC with reduced dead times and
propagation delays further enhances the performance
of this part. A thermal warning function has been
included to warn of
a potential overꢀtemperature
Thermal Warning Flag for OverꢀTemperature
Condition
situation. The FDMF6705 also incorporates features,
such as Skip Mode (SMOD), for improved lightꢀload
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Driver Output Disable Function (DISB# Pin)
efficiency along with
a
3ꢀstate PWM input for
compatibility with a wide range of PWM controllers.
Internal PullꢀUp and PullꢀDown for SMOD# and
DISB# Inputs, Respectively
Applications
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Fairchild PowerTrench® Technology MOSFETs for
Clean Voltage Waveforms and Reduced Ringing
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HighꢀPerformance Gaming Motherboards
Fairchild SyncFET™ (Integrated Schottky Diode)
Technology in the LowꢀSide MOSFET
Compact Blade Servers, VꢀCore and NonꢀVꢀCore
DCꢀDC Converters
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Integrated Bootstrap Schottky Diode
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Desktop Computers, VꢀCore and NonꢀVꢀCore
DCꢀDC Converters
Adaptive Gate Drive Timing for Shootꢀthrough
Protection
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Workstations
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UnderꢀVoltage Lockout (UVLO)
HighꢀCurrent DCꢀDC PointꢀofꢀLoad (POL)
Converters
Optimized for Switching Frequencies up to 1MHz
LowꢀProfile SMD Package
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Networking and Telecom Microprocessor Voltage
Regulators
Fairchild Green Packaging and RoHS Compliant
Based on the Intel® 4.0 DrMOS Standard
Small FormꢀFactor Voltage Regulator Modules
Ordering Information
Part
Number
Current
Rating
Input
Voltage
Maximum
Frequency
Package
Top Mark
40ꢀLead, Clipbond PQFN DrMOS,
6.0x6.0mm Package
FDMF6705
38A
19V
1000kHz
FDMF6705
© 2011 Fairchild Semiconductor Corporation
FDMF6705 • Rev. 1.0 0
www.fairchildsemi.com