L6747ATR Datasheet, PDF (1/15 Pages) STMicroelectronics – High current MOSFET driver

L6747A
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 overvoltage (OV) protection
■ VFDFPN8 3x3 mm package
Applications
■ High current VRM / VRD for desktop / server /
workstation CPUs
■ High current and high efficiency DC-DC
converters
Description
The L6747A is a flexible, high-frequency dual-
driver specifically designed to drive N-channel
MOSFETs connected in synchronous-rectified
buck topology.
Combined with ST PWM controllers, the driver
allows the implementation of complete voltage
VFDFPN8 3x3 mm
regulator solutions for modern high-current CPUs
and for DC-DC conversion in general.
The L6747A embeds high-current drivers for both
high-side and low-side MOSFETS. The device
accepts a flexible power supply of 5 V to 12 V.
This allows optimization of the high-side and low-
side gate-drive voltage to maximize system effi-
ciency.
The embedded bootstrap diode eliminates the
need for external diodes. Anti shoot-through man-
agement prevents the high-side and low-side
MOSFETs from conducting simultaneously and,
combined with adaptive dead-time control, mini-
mizes the LS body diode conduction time.
The L6747A features preliminary OV protection to
protect the load from dangerous overvoltage due
to MOSFET failures at startup.
The L6747A device is available in a VFDFPN8
3x3 mm package.
Table 1.
Device summary
Order code
L6747A
L6747ATR
Package
VFDFPN8
VFDFPN8
Packing
Tube
Tape and reel
March 2010
Doc ID 17126 Rev 1
1/15
www.st.com
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