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L6743B Datasheet(PDF) 1 Page - STMicroelectronics |
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L6743B Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 16 page  June 2008 Rev 1 1/16 1 L6743B 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 ■ VFDFPN8 3 x 3 mm package 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. 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. VFDFPN8 3 x 3 mm Table 1. Device summary Order code Package Packing L6743B VFDFPN8 Tube L6743BTR Tape and reel www.st.com |
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