Overview
The NCP81151MNTBG is a high-performance dual MOSFET gate driver designed by onsemi. This component is optimized to drive the gates of both high-side and low-side power MOSFETs in a synchronous buck converter. It is particularly suited for power management solutions in notebook systems, offering high efficiency and low switching losses. The device features adaptive anti-cross-conduction and power-saving operation, ensuring reliable and efficient performance under various load conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Operation Voltage | 4.5 | 5.5 | 5.5 | V |
| VCC UVLO Start Threshold | 3.8 | 4.35 | 4.5 | V |
| BST Bootstrap Supply Voltage | - | - | 35 V wrt/GND, 40 V < 50 ns wrt/GND | V |
| DRVH Rise Time | 16 | 25 | - | ns |
| DRVH Fall Time | 11 | 18 | - | ns |
| DRVL Rise Time | 16 | 25 | - | ns |
| DRVL Fall Time | 11 | 15 | - | ns |
| Propagation Delay (DRVH, DRVL) | 10 | - | 30 ns | ns |
| Operating Junction Temperature Range | -40 | - | 150 | °C |
| Operating Ambient Temperature Range | -40 | - | 100 | °C |
Key Features
- Faster Rise and Fall Times: The NCP81151MNTBG offers fast rise and fall times, enhancing the overall efficiency of the synchronous buck converter.
- Adaptive Anti-Cross-Conduction Circuit: This feature prevents shoot-through damage by ensuring that the high-side and low-side MOSFETs do not conduct simultaneously.
- Zero Cross Detection (ZCD): The device includes a ZCD function to optimize the switching operation and reduce losses.
- Output Disable Control: The EN pin allows for disabling both MOSFETs, forcing the circuit into diode mode if necessary.
- Undervoltage Lockout (UVLO): Ensures that the outputs are low when the supply voltage is below the threshold, preventing improper operation.
- Power Saving Operation: The device operates in a power-saving mode under light load conditions, reducing standby current.
- Direct Interface to PWM Controllers: Compatible with ON Semiconductor’s NCP6131 multi-phase controller and other compatible PWM controllers.
- Thermally Enhanced Package: The DFN8 package is designed for good heat dissipation, ensuring reliable operation in various environments.
- RoHS Compliant: The device is Pb-free, halogen-free, and BFR-free, making it environmentally friendly.
Applications
The NCP81151MNTBG is primarily designed for power management solutions in notebook systems. It is also suitable for other applications requiring high-efficiency synchronous buck converters, such as:
- Notebook power supplies
- DC-DC converters in various electronic devices
- High-efficiency power management systems
Q & A
- What is the primary function of the NCP81151MNTBG?
The NCP81151MNTBG is a dual MOSFET gate driver designed to drive the gates of both high-side and low-side power MOSFETs in a synchronous buck converter.
- What are the key features of the NCP81151MNTBG?
Key features include adaptive anti-cross-conduction, zero cross detection, output disable control, undervoltage lockout, and power-saving operation.
- What is the operating voltage range for VCC?
The VCC operation voltage range is from 4.5 V to 5.5 V.
- What is the purpose of the UVLO function?
The UVLO function ensures that the outputs are low when the supply voltage is below the threshold, preventing improper operation.
- How does the adaptive anti-cross-conduction circuit work?
The circuit prevents shoot-through damage by ensuring that the high-side and low-side MOSFETs do not conduct simultaneously.
- What is the significance of the ZCD function?
The ZCD function optimizes the switching operation and reduces losses by detecting when the inductor current crosses zero.
- What is the package type of the NCP81151MNTBG?
The device is packaged in a DFN8 (2x2 mm) thermally enhanced package.
- Is the NCP81151MNTBG RoHS compliant?
Yes, the device is Pb-free, halogen-free, and BFR-free, making it RoHS compliant.
- What are the typical applications of the NCP81151MNTBG?
The device is primarily used in notebook power supplies and other high-efficiency DC-DC converter applications.
- How does the power-saving operation work under light load conditions?
The device operates in a power-saving mode under light load conditions, reducing the standby current to minimize power consumption.
