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Fairchild Semiconductor Electronic Components Datasheet

FDMF6708N Datasheet

High-Frequency DrMOS

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April 2013
FDMF6708N — 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: 50 A
High-Performance PQFN Copper-Clip Package
3-State 5 V PWM Input Driver
Automatic Diode Emulation (Skip Mode) enabled
through ZCD_EN# Input
Thermal Warning Flag for Over-Temperature
Condition
Driver Output Disable Function (DISB# Pin)
Internal Pull-Up and Pull-Down for ZCD_EN# and
DISB# Inputs, Respectively
Fairchild PowerTrench® Technology MOSFETs for
Clean Voltage Waveforms and Reduced Ringing
Fairchild SyncFET™ (Integrated Schottky Diode)
Technology in 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 1MHz
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
FDMF6708N integrates a driver IC, two power
MOSFETs, and a bootstrap Schottky diode into a
thermally enhanced, ultra-compact 6x6 mm package.
With an integrated approach, the complete switching
power stage is optimized with regard to driver and
MOSFET dynamic performance, system inductance,
and power MOSFET RDS(ON). XS™ DrMOS uses
Fairchild's high-performance PowerTrench® MOSFET
technology, which dramatically reduces switch ringing,
eliminating the need for snubber circuit in most buck
converter applications.
A driver IC with reduced dead times and propagation
delays further enhances the performance. A thermal
warning function warns of a potential over-temperature
situation. The FDMF6708N also incorporates a Zero-
Cross Detect (ZCD_EN#) for improved light-load
efficiency. The FDMF6708N also provides a 3-state 5 V
PWM input for compatibility with a wide range of PWM
controllers.
Applications
Notebook Computers
High-Performance Gaming Motherboards
Compact Blade Servers & Workstations, V-Core
and Non-V-Core DC-DC Converters
Desktop Computers, V-Core and Non-V-Core
DC-DC Converters
High-Current DC-DC Point-of-Load Converters
Networking and Telecom Microprocessor Voltage
Regulators
Small Form-Factor Voltage Regulator Modules
Ordering Information
Part Number Current Rating
Package
Top Mark
FDMF6708N
50 A
40-Lead, Clipbond PQFN DrMOS, 6.0 mm x 6.0 mm Package FDMF6708N
© 2011 Fairchild Semiconductor Corporation
FDMF6708N • Rev. 1.0.3
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FDMF6708N Datasheet

High-Frequency DrMOS

No Preview Available !

Typical Application Circuit
V5V
C VDRV
RVCIN
CVCIN
CVIN
VIN
3V ~ 24V
DISB#
PWM
Input
OFF
ON
Open-
Drain
Output
VDRV VCIN
VIN
DISB#
RBOOT
BOOT
PWM
SMOD#
FDMF6708N
PHASE
CBOOT
THWN#
CGND
VSWH
PGND
LOUT
COUT
VOUT
Figure 1. Typical Application Circuit
DrMOS Block Diagram
VCIN
UVLO
DISB#
10µA
VCIN
PWM
RUP_PWM
RDN_PWM
Input
3-State
Logic
THWN#
Temp.
Sense
VDRV
GH
Logic
DBoot
Level-Shift
Dead-Time
Control
VCIN
GL
Logic
10µA
BOOT
VIN
Q1
HS Power
MOSFET
GH
20kΩ
PHASE
VDRV
GL
VSWH
Q2
LS Power
MOSFET
CGND
ZCD_EN#
Figure 2. DrMOS Block Diagram
PGND
© 2011 Fairchild Semiconductor Corporation
FDMF6708N • Rev. 1.0.3
2
www.fairchildsemi.com


Part Number FDMF6708N
Description High-Frequency DrMOS
Maker Fairchild Semiconductor
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