Overview
The NCP81161, produced by onsemi, is a high-performance dual MOSFET gate driver designed to drive the gates of both high-side and low-side power MOSFETs in a synchronous buck converter. This component is optimized for applications in notebook and desktop systems, offering low switching losses and high efficiency. The NCP81161 features adaptive anti-cross-conduction and power-saving operation, making it an ideal choice for power management solutions.
Key Specifications
| Parameter | Min. | Typ. | Max. | Units |
|---|---|---|---|---|
| VCC Operation Voltage | 4.5 | 13.2 | V | |
| Power ON Reset Threshold | 2.75 | 3.2 | V | |
| VCC Start Threshold | 3.8 | 4.35 | 4.5 | V |
| VCC UVLO Hysteresis | 150 | 200 | 250 | mV |
| Bootstrap Supply Voltage | 35 V wrt/GND | V | ||
| High Side Driver Output Impedance (Sourcing Current) | 1.9 | 3.0 | Ω | |
| High Side Driver Output Impedance (Sinking Current) | 1.0 | 1.7 | Ω | |
| DRVH Rise Time | 16 | 30 | ns | |
| DRVH Fall Time | 11 | 25 | ns | |
| Operating Junction Temperature Range | 0 | 150 | °C | |
| Operating Ambient Temperature Range | −10 | 125 | °C |
Key Features
- Faster Rise and Fall Times: Ensures efficient switching operations.
- Adaptive Anti-Cross-Conduction Circuit: Prevents simultaneous conduction of high-side and low-side MOSFETs.
- Integrated Bootstrap Diode: Simplifies the circuit design and reduces component count.
- Pre-OV Function: Protects against overvoltage conditions.
- ZCD Detect: Zero Cross Detection for efficient operation in discontinuous conduction mode (DCM).
- Floating Top Driver: Accommodates boost voltages up to 35 V.
- Output Disable Control: Turns off both MOSFETs for power saving.
- Under-Voltage Lockout: Ensures the outputs are low when the supply voltage is low.
- Power Saving Operation: Reduces power consumption under light load conditions.
- Direct Interface to PWM Controllers: Compatible with controllers like the NCP6151.
- Thermally Enhanced Package: Improves thermal performance.
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant: Meets environmental standards.
Applications
The NCP81161 is primarily used in power solutions for desktop systems. It is designed to work with ON Semiconductor’s NCP6131 multi-phase controller and is optimized for driving N-channel MOSFETs in synchronous buck converter topologies.
Q & A
- What is the primary function of the NCP81161?
The NCP81161 is a high-performance 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 NCP81161?
Key features include adaptive anti-cross-conduction, integrated bootstrap diode, pre-OV function, ZCD detect, floating top driver, output disable control, under-voltage lockout, power saving operation, and direct interface to PWM controllers.
- What is the operating voltage range for VCC?
The VCC operation voltage range is from 4.5 V to 13.2 V.
- What is the purpose of the under-voltage lockout (UVLO) function?
The UVLO function ensures that the outputs are low when the supply voltage is low, preventing abnormal operation during startup.
- How does the adaptive anti-cross-conduction circuit work?
The adaptive anti-cross-conduction circuit prevents simultaneous conduction of high-side and low-side MOSFETs, reducing switching losses and improving efficiency.
- What is the maximum bootstrap supply voltage?
The maximum bootstrap supply voltage is 35 V with respect to GND.
- What are the typical applications of the NCP81161?
The NCP81161 is typically used in power solutions for desktop systems and is designed to work with ON Semiconductor’s NCP6131 multi-phase controller.
- How does the power-on reset feature work?
The power-on reset feature protects the gate driver from abnormal status during startup by monitoring the switching node and forcing the bottom gate high to discharge the output capacitor if necessary.
- What is the purpose of the bi-directional EN pin?
The bi-directional EN pin can provide a fault signal to the controller when the gate driver detects faults such as power-on reset or under-voltage lockout.
- What is the thermal characteristic (RJA) of the NCP81161?
The thermal characteristic (RJA) of the NCP81161 is 74 °C/W.
