April 2014
FDMF5823DC – Smart Power Stage (SPS) Module
with Integrated Thermal Warning and Thermal Shutdown
Features
Description
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Ultra-Compact 5 mm x 5 mm PQFN Copper-Clip
Package with Flip Chip Low-Side MOSFET and
Dual Cool Architecture
The SPS 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
FDMF5823DC integrates a driver IC with a bootstrap
Schottky diode, two power MOSFETs, and a thermal
monitor into a thermally enhanced, ultra-compact 5 mm,
x 5 mm package.
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High Current Handling: 55 A
3-State 5 V PWM Input Gate Driver
Dynamic Resistance Mode for Low-Side Drive
(LDRV) Slows Low-Side MOSFET during Negative
Inductor Current Switching
With an integrated approach, the SPS switching power
stage is optimized for driver and MOSFET dynamic
performance, minimized system inductance, and power
MOSFET RDS(ON). The SPS family uses Fairchild's high-
performance PowerTrench® MOSFET technology,
which reduces switch ringing, eliminating the need for a
snubber circuit in most buck converter applications.
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Auto DCM (Low-Side Gate Turn Off) Using
ZCD# Input
Thermal Warning (THWN#) to Warn Over-
Temperature of Gate Driver IC
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Thermal Shutdown (THDN)
HS-Short Detect Fault# / Shutdown
Dual Mode Enable / Fault# Pin
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. A thermal shutdown function turns off the
driver if an over-temperature condition occurs. The
FDMF5823DC incorporates an Auto-DCM Mode (ZCD#)
for improved light-load efficiency. The FDMF5823DC
also provides a 3-state 5 V PWM input for compatibility
with a wide range of PWM controllers.
Internal Pull-Up and Pull-Down for ZCD# and
EN Inputs, respectively
Fairchild PowerTrench® MOSFETs for Clean
Voltage Waveforms and Reduced Ringing
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Fairchild SyncFET™ Technology (Integrated
Schottky Diode) in Low-Side MOSFET
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Integrated Bootstrap Schottky Diode
Applications
Optimized / Extremely Short Dead-Times
Under-Voltage Lockout (UVLO) on VCC
Optimized for Switching Frequencies up to 1.5 MHz
PWM Minimum Controllable On-Time: 30 ns
Low Shutdown Current: < 3 µA
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Servers and Workstations, V-Core and Non-V-Core
DC-DC Converters
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Desktop and All-in-One Computers, V-Core and
Non-V-Core DC-DC Converters
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High-Performance Gaming Motherboards
Optimized FET Pair for Highest Efficiency:
10 ~ 15% Duty Cycle
High-Current DC-DC Point-of-Load Converters
Networking and Telecom Microprocessor Voltage
Regulators
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Operating Ambient Temperature Range:
-40°C to +125°C
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Small Form-Factor Voltage Regulator Modules
Fairchild Green Packaging and RoHS Compliance
Ordering Information
Part Number Current Rating
Package
Top Mark
FDMF5823DC
55 A
31-Lead, Clip Bond PQFN SPS, 5.0 mm x 5.0 mm Package
5823DC
© 2013 Fairchild Semiconductor Corporation
FDMF5823DC • Rev. 1.0.2
www.fairchildsemi.com