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L6743B Datasheet, PDF (1/16 Pages) STMicroelectronics – High current MOSFET driver | |||
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L6743B
High current MOSFET driver
Features
â Dual MOSFET driver for synchronous rectified
converters
â High driving current for fast external MOSFET
switching
â Integrated bootstrap diode
â High frequency operation
â Enable pin
â Adaptive dead-time management
â Flexible gate-drive: 5 V to 12 V compatible
â High-impedance (HiZ) management for output
stage shutdown
â Preliminary OV protection
â VFDFPN8 3 x 3 mm package
Applications
â High current VRM / VRD for desktop / server /
workstation CPUs
â High current and high efficiency DC / DC
converters
Description
L6743B is a flexible, high-frequency dual-driver
specifically designed to drive N-channel
MOSFETs connected in synchronous-rectified
buck topology.
VFDFPN8 3 x 3 mm
Combined with ST PWM controllers, the driver
allows implementing complete voltage regulator
solutions for modern high-current CPUs and
DC-DC conversion in general. L6743B 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.
L6743B 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 VFDFPN8 3 x 3 mm
packages.
Table 1.
Device summary
Order code
L6743B
L6743BTR
Package
VFDFPN8
Packing
Tube
Tape and reel
June 2008
Rev 1
1/16
www.st.com
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