L6741TR STMicroelectronics

L6741 High current MOSFET driver Features Dual MOSFET driver for synchronous rectified converters High driving current for fast external MOSFET switching High frequency operation SO-8 Integrated bootstrap diode Adaptive dead-time management Description Flexible gate-drive: 5V to 12V compatible L6741 is a flexible, high-frequency dual-driver High-impedance (HiZ) management for output specifically designed to drive N-channel stage shutdown MOSFETs connected in Synchronous-Rectified Preliminary OV protection Buck topology. Combined with ST PWM SO-8 package controllers, the driver allows implementing complete voltage regulator solutions for modern high-current CPUs. L6741 embeds high-current Applications drivers for both high-side and low-side High current VRM / VRD for Desktop / Server / MOSFETS. The device accepts flexible power Workstation CPUs supply (5V to 12V) to optimize the gate-drive voltage for High-Side and Low-Side maximizing High current DC / DC converters 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. L6741 embeds Preliminary OV Protection: after Vcc overcomes the UVLO and while the device is in HiZ, the Low-Side MOSFET is turned ON to protect the load in case the output voltage overcomes a warning threshold protecting the load from High-Side MOSFET failures. The driver is available is SOP8 package. Table 1. Device summary Order code Package Packaging L6741 SO-8 Tube L6741TR SO-8 Tape & Reel August 2007 Rev 1 1/16 www.st.com 1Contents L6741 Contents 1 Typical application circuit and block diagram 3 1.1 Application circuit 3 1.2 Block diagram . 3 2 Pins description and connection diagrams 4 2.1 Pin description 4 3 Thermal data . 5 4 Electrical specifications 5 4.1 Absolute maximum ratings . 5 4.2 Electrical characteristics . 5 5 Device description and operation 7 5.1 High-impedance (HiZ) management . 8 5.2 Preliminary OV protection . 8 5.3 Internal BOOT diode . 8 5.4 Gate driver voltage flexibility 9 5.5 Power dissipation 9 5.6 Layout guidelines . 11 6 Package mechanical data 13 7 Revision history . 15 2/16