L6743B| Datasheet

L6743B, L6743BTR

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L6743B
High current MOSFET driver
Data Brief

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 VFDFPN8 3x3 package
VFDFPN8 3X3 mm

Combined with ST PWM controllers, the driver allows implementing complete voltage regulator solutions for modern high-current CPUs and DCDC conversion in general. L6743B embeds high-current drivers for both high-side and lowside MOSFETs. The device accepts flexible power supply (5 V to 12 V) to optimize the gatedrive 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 3x3 mm packages. .

Applications

High current VRM / VRD for desktop / server / workstation CPUs 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.

Table 1.

Device summary
Order codes L6743B L6743BTR Package VFDFPN8 VFDFPN8 Packaging Tube Tape and reel

February 2008

Rev 1

1/6
www.st.com 6

For further information contact your local STMicroelectronics sales office.