L6743Q datasheet(1/17 Pages) STMICROELECTRONICS

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June 2008

Rev 2

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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: 5 V to 12 V 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.

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 (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.

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 SO-8 and DFN10 3x3

packages

SO-8

DFN10 3x3

Table 1.

Device summary

Order code

Package

Packaging

L6743

SO-8

Tube

L6743TR

SO-8

Tape and reel

L6743Q

DFN10

Tube

L6743QTR

DFN10

Tape and reel

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Số phần tương tự - L6743Q

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	L6743Q	317Kb / 17P	High current MOSFET driver 20-Aug-2007

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