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L6743B：High current MOSFET driver

L6743B 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 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.

Key Features

• VFDFPN8 3 x 3 mm package
• Preliminary OV protection
• Flexible gate-drive: 5 V to 12 V compatible
• Adaptive dead-time management
• Dual MOSFET driver for synchronous rectified converters
• Integrated bootstrap diode
• High driving current for fast external MOSFET switching
• Enable pin
• High-impedance (HiZ) management for output stage shutdown
• High frequency operation

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