Overview
The L6743QTR, produced by STMicroelectronics, is a high-current dual MOSFET driver designed for synchronous rectified converters, particularly in step-down DC-DC converter configurations. This device is optimized for driving N-channel MOSFETs and is part of the L6743 and L6743Q series. It offers high-frequency operation, adaptive dead-time management, and integrated bootstrap diode, making it suitable for high-current voltage regulator modules (VRMs) and DC-DC converters in various applications such as desktop, server, and workstation CPUs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Supply Voltage | 5 to 12 | V |
| Maximum Junction Temperature | 150 | °C |
| Storage Temperature Range | 0 to 150 | °C |
| Junction Temperature Range | 0 to 125 | °C |
| Maximum Power Dissipation at 25°C | 1.15 (SO-8), 2.25 (DFN10) | W |
| Thermal Resistance Junction to Ambient | 85 (SO-8), 45 (DFN10) | °C/W |
| High-Side Driver Supply Current | 2 mA | |
| Low-Side Source Resistance | 1.3 to 1.8 Ω | |
| Low-Side Sink Resistance | 1 to 1.5 Ω | |
| Preliminary Over-Voltage Threshold | 1.8 V |
Key Features
- Dual MOSFET driver for synchronous rectified converters
- High driving current for fast external MOSFET switching
- Integrated bootstrap diode
- High frequency operation
- Enable pin and adaptive dead-time management
- Flexible gate-drive: 5 V to 12 V compatible
- High-impedance (HiZ) management for output stage shutdown
- Preliminary over-voltage protection
- Available in SO-8 and DFN10 3x3 packages
Applications
- High current VRM / VRD for desktop, server, and workstation CPUs
- High current and high efficiency DC-DC converters
Q & A
- What is the primary function of the L6743QTR? The L6743QTR is a high-current dual MOSFET driver designed for synchronous rectified converters, particularly in step-down DC-DC converter configurations.
- What are the supported supply voltage ranges for the L6743QTR? The device supports supply voltages between 5 V and 12 V.
- What is the maximum junction temperature for the L6743QTR? The maximum junction temperature is 150°C.
- What types of packages are available for the L6743QTR? The device is available in SO-8 and DFN10 3x3 packages.
- What is the purpose of the integrated bootstrap diode in the L6743QTR? The integrated bootstrap diode supplies the high-side driver, eliminating the need for an external bootstrap diode.
- How does the adaptive dead-time management work in the L6743QTR? The adaptive dead-time management minimizes the low-side body diode conduction time by adjusting the dead-time based on the switching conditions.
- What is the preliminary over-voltage protection feature in the L6743QTR? This feature protects the load from over-voltage by latching the low-side MOSFET on if the phase pin voltage exceeds a certain threshold during the high-impedance state.
- How does the high-impedance (HiZ) management work in the L6743QTR? The HiZ management allows the output stage to be shut down, keeping all MOSFETs off, which is controlled by the enable pin and PWM input.
- What are the typical applications of the L6743QTR? Typical applications include high current VRM/VRD for desktop, server, and workstation CPUs, and high current and high efficiency DC-DC converters.
- Is the L6743QTR still in production? No, the L6743QTR is listed as obsolete and is no longer manufactured.
