Overview
The NCP3420DR2G, produced by onsemi, is a single-phase MOSFET driver optimized for synchronous buck converters. It is designed to drive the gates of both high-side and low-side power MOSFETs, ensuring efficient and reliable operation. The driver supports a wide operating voltage range and features internal adaptive nonoverlap circuitry to reduce switching losses. It also includes thermal shutdown and undervoltage lockout functions for system protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Ambient Temperature | 0 to 85 | °C |
| Operating Junction Temperature | 0 to 150 | °C |
| Supply Voltage Range | 4.6 to 13.2 | V |
| Bootstrap Supply Voltage | Up to 35 V (wrt/PGND), 40 V transient | V |
| Propagation Delay Time (High-Side) | 20 to 45 ns | ns |
| Propagation Delay Time (Low-Side) | 15 to 45 ns | ns |
| Transition Times (High-Side) | 16 to 30 ns | ns |
| Transition Times (Low-Side) | 16 to 30 ns | ns |
| Output Resistance (High-Side Sourcing) | 1.8 to 3.0 Ω | Ω |
| Output Resistance (Low-Side Sourcing) | 1.8 to 3.0 Ω | Ω |
| Thermal Shutdown Temperature | 150 to 170 °C | °C |
Key Features
- Thermal Shutdown for system protection
- Internal adaptive nonoverlap circuitry to prevent cross-conduction
- Output Disable control to turn off both MOSFETs
- Undervoltage Lockout (UVLO) function
- Internal pulldown resistor to suppress transient turn-on of either MOSFET
- Compliance with VRM10.x and VRM11.x specifications
- Thermally enhanced package available
- Pb-Free device
Applications
The NCP3420DR2G is designed for use in synchronous buck converter topologies, particularly in high-current multi-phase buck regulators that convert 12 V rails directly to the core voltage required by complex logic chips. It is suitable for applications requiring efficient and reliable power conversion, such as in server power supplies, desktop computers, and other high-power electronic systems.
Q & A
- What is the primary function of the NCP3420DR2G?
The NCP3420DR2G is a MOSFET driver designed to drive the gates of both high-side and low-side power MOSFETs in synchronous buck converters. - What is the operating voltage range of the NCP3420DR2G?
The NCP3420DR2G operates within a supply voltage range of 4.6 V to 13.2 V. - What protection features does the NCP3420DR2G include?
The NCP3420DR2G includes thermal shutdown, undervoltage lockout (UVLO), and internal adaptive nonoverlap circuitry to prevent cross-conduction. - How does the bootstrap circuit work in the NCP3420DR2G?
The bootstrap circuit involves an external diode and capacitor to generate the gate voltage for the high-side MOSFET, ensuring it is referenced to the switch node (SW) pin. - What is the purpose of the Output Disable (OD) pin?
The Output Disable (OD) pin allows for normal operation to be disabled, forcing both DRVH and DRVL outputs low. - What are the recommended capacitors for the VCC and bootstrap circuits?
A 1.0 μF ceramic capacitor should be connected from VCC to PGND, and a bootstrap capacitor between 100 nF and 1.0 μF is recommended. - How does the NCP3420DR2G prevent cross-conduction?
The NCP3420DR2G prevents cross-conduction by monitoring the status of the external MOSFETs and applying the appropriate amount of “dead-time” between the turn-off of one MOSFET and the turn-on of the other. - What is the maximum junction temperature for the NCP3420DR2G?
The maximum junction temperature is 150 °C, with thermal shutdown occurring between 150 °C and 170 °C. - Is the NCP3420DR2G Pb-Free?
Yes, the NCP3420DR2G is a Pb-Free device. - What are the typical transition times for the high-side and low-side drivers?
The typical transition times are 16 to 30 ns for both high-side and low-side drivers.
