L6743 Datasheet, PDF (1/17 Pages) STMicroelectronics – High current MOSFET driver

L6743
L6743Q
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: 5V to 12V compatible
■ High-impedance (HiZ) management for output
stage Shutdown
■ Preliminary OV protection
■ SO-8 and DFN10 3x3 packages
Applications
■ High current VRM / VRD for Desktop / Server /
Workstation CPUs
■ High current and high efficiency DC / DC
converters
Description
L6743, L6743Q is a flexible, high-frequency dual-
driver specifically designed to drive N-channel
MOSFETs connected in Synchronous-Rectified
Buck topology.
SO-8
DFN10 3x3
Combined with ST PWM Controllers, the driver
allows implementing complete voltage regulator
solutions for modern high-current CPUs and
DCDC conversion in general. L6743, L6743Q
embeds high-current drivers for both high-side
and low-side MOSFETS. The device accepts
flexible power supply (5V to 12V) 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.
L6743, L6743Q 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 and DFN10 3x3
packages
Table 1.
Device summary
Order code
L6743
L6743TR
L6743Q
L6743QTR
August 2007
Package
SO-8
SO-8
DFN10
DFN10
Rev 1
Packaging
Tube
Tape & Reel
Tube
Tape & Reel
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