L6743, L6743Q is a high-performance MOSFET driver from ST company. It supports the synchronous rectifier buck topology, and has the characteristics of high drive current, high frequency operation, integrated bootstrap diode, adaptive dead-time management, etc. It is suitable for high current CPU and DCDC converter applications.
The L6743 and L6743Q are flexible, high-frequency dual drivers specifically designed to drive N-channel MOSFETs connected in synchronous-rectified buck topology. These devices are intended for use with ST PWM controllers to implement complete voltage regulator solutions for modern high-current CPUs and general DC/DC conversion. The drivers embed high-current drivers for both high-side and low-side MOSFETs and accept a flexible power supply ranging from 5 V to 12 V to optimize gate-drive voltage.
| Supply voltage range | 5 V to 12 V |
|---|---|
| VCC supply current | 5 mA |
| BOOT supply current | 2 mA |
| HS source resistance | 2.3 to 2.8 Ohms |
| LS source resistance | 1.3 to 1.8 Ohms |
| Pre-OV threshold | 1.8 V |
| Maximum junction temperature | 150 C |
The integrated bootstrap diode saves the use of external diodes.
Pulling the EN pin low causes the driver to enter the high-impedance (HiZ) state with all MOSFETs OFF.
It latches the low-side MOSFET ON to protect the load from dangerous over-voltage if the PHASE pin voltage exceeds 1.8 V.