L6743D Datasheet, PDF (1/16 Pages) STMicroelectronics – High current MOSFET driver

L6743D
High current MOSFET driver
Features
■ Dual MOSFET driver for synchronous rectified
converters
■ High driving current for fast external MOSFET
switching
■ Integrated bootstrap diode
■ High frequency operation
■ Enable pin
■ Adaptive dead-time management
■ Flexible gate-drive: 5 V to 12 V compatible
■ High-impedance (HiZ) management for output
stage shutdown
■ Preliminary OV protection
■ SO8 package
Applications
■ High current VRM / VRD for desktop / server /
workstation CPUs
■ High current and high efficiency DC / DC
converter
Description
L6743D is a flexible, high-frequency dual-driver
specifically designed to drive N-channel
MOSFETs connected in synchronous-rectified
buck topology.
SO8
Combined with ST PWM controllers, the driver
allows implementing complete voltage regulator
solutions for modern high-current CPUs and
DCDC conversion in general. L6743D embeds
high-current drivers for both high-side and low-
side MOSFETS. The device accepts flexible
power supply (5 V to 12 V) to optimize the gate-
drive voltage for high-side and low-side
maximizing the system efficiency.
The bootstrap diode is embedded saving the use
of external diodes. Anti shoot-through
management avoids high-side and low-side
MOSFET to conduct simultaneously and,
combined with adaptive dead-time control,
minimizes the LS body diode conduction time.
L6743D embeds preliminary OV protection: after
Vcc overcomes the UVLO and while the device is
in HiZ, the LS MOSFET is turned ON to protect
the load in case the output voltage overcomes a
warning threshold protecting the output against
HS failures.
The driver is available is SO8 package.
Table 1.
Device summary
Order codes
L6743D
L6743DTR
Package
SO8
Packing
Tube
Tape and reel
December 2008
Rev 1
1/16
www.st.com
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