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FAN53418M Datasheet

  • FAN53418M

  • Synchronous DC-DC MOSFET Driver

  • 11頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN53418
Synchronous DC-DC MOSFET Driver
Features
鈥?Drives N-channel High-Side and Low-Side MOSFETs in
a synchronous buck con鏗乬uration
鈥?Internal Adaptive 鈥淪hoot-Through鈥?Protection
鈥?High Switching Frequency (> 500kHz)
鈥?30ns Output Rise/Fall Times w/3000pF load
鈥?20ns Propagation Delay
鈥?12V High-Side and 12V Low-Side Drive
鈥?OD input for Output Disable 鈥?allows for synchronization
with PWM controller
鈥?SOIC-8 Package
General Description
The FAN53418 is a high frequency, dual MOSFET driver
speci鏗乧ally designed to drive two power N-Channel
MOSFETs in a synchronous recti鏗乪d buck converter.
These drivers combined with a FAN53168 Multi-Phase Buck
PWM controller and power MOSFETs form a complete core
voltage regulator solution for advanced microprocessors.
The FAN53418 drives both the upper and lower gates in a
synchronous recti鏗乪r to +12V. The upper gate drive imple-
ments bootstrapping with only an external capacitor and
diode required. This reduces implementation complexity
and allows the use of higher performance, cost effective,
N-Channel MOSFETs.
The output drivers in the FAN53418 have the capacity to
ef鏗乧iently switch power MOSFETs at frequencies over
500kHz. Each driver is capable of driving a 3000pF load
with a ~20ns propagation delay and ~30ns transition time.
Adaptive shoot-through protection is integrated to prevent
both MOSFETs from conducting simultaneously. Addition-
ally an Output Disable function is included to synchronize
the driver with the PWM controller. The FAN53418 is
rated for operation from 0擄C to +85擄C and is available in a
low-cost SOIC-8 package.
Applications
鈥?Multi-phase VRM/VRD regulators for Microprocessor
Power
鈥?High Current/High Frequency DC/DC Converters
鈥?High Power Modular Power Supplies
Basic Application
+12V
C BST
D1
Q1
1
BST
DRVH
8
L1
2
IN
FAN54318
3
OD
PGND
6
Q2
4
C VCC
VCC
DRVL 5
SW
7
C VIN
Figure 1. Basic Application Circuit
REV. 1.0.0 6/11/03

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