Overview
The NCP3420MNR2G, produced by onsemi, is a single-phase MOSFET driver optimized for driving the gates of both high-side and low-side power MOSFETs in synchronous buck converters. This device is designed to enhance the efficiency and reliability of power conversion systems, particularly in high-current multi-phase buck regulators. It operates over a wide voltage range and includes several protective features such as thermal shutdown, undervoltage lockout, and anti-cross-conduction circuitry.
Key Specifications
| Characteristic | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Ambient Temperature, TA | 0 | 85 | °C | ||
| Operating Junction Temperature, TJ | 0 | 150 | °C | ||
| Supply Voltage Range, VCC | 4.6 | 13.2 | V | ||
| Supply Current, ISYS | BST = 12 V, IN = 0 V | −0.7 | 6.0 | mA | |
| Propagation Delay Time, tpdlOD | 1.0 | 45 | ns | ||
| Transition Times, trDRVH | VBST − VSW = 12 V, CLOAD = 3.0 nF | 16 | 30 | ns | |
| Undervoltage Lockout, UVLO Startup | 3.9 | 4.5 | V | ||
| Thermal Shutdown Over Temperature Protection | 150 | 170 | °C |
Key Features
- Thermal Shutdown for System Protection: Provides overtemperature protection to ensure the IC does not operate beyond safe temperature limits.
- Internal Adaptive Nonoverlap Circuitry: Prevents simultaneous conduction of both MOSFETs, reducing switching losses and enhancing efficiency.
- Output Disable Control: Allows both MOSFETs to be turned off by applying a low logic level to the Output Disable (OD) pin.
- Undervoltage Lockout (UVLO): Ensures that both driver outputs are low when the supply voltage is below a certain threshold.
- Compliance with VRM10.x and VRM11.x Specifications: Meets industry standards for voltage regulator modules.
- Thermally Enhanced Package Available: Offers improved thermal performance for high-power applications.
- Pb-Free Devices: Environmentally friendly packaging.
Applications
The NCP3420MNR2G is primarily used in synchronous buck converter topologies, particularly in high-current multi-phase buck regulators. These regulators are essential in power supply systems for complex logic chips, such as those found in computing and telecommunications equipment. The device is also suitable for other applications requiring efficient and reliable power conversion.
Q & A
- What is the primary function of the NCP3420MNR2G?
The NCP3420MNR2G 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 NCP3420MNR2G?
The device operates over a supply voltage range of 4.6 V to 13.2 V.
- How does the NCP3420MNR2G prevent cross-conduction between MOSFETs?
The device includes internal adaptive nonoverlap circuitry that monitors the status of the external MOSFETs and applies the appropriate amount of “dead-time” to prevent simultaneous conduction.
- What protective features does the NCP3420MNR2G include?
The device includes thermal shutdown, undervoltage lockout, and anti-cross-conduction circuitry.
- What type of package is available for the NCP3420MNR2G?
The device is available in SO-8 and DFN8 packages, both of which are Pb-free.
- How does the bootstrap circuit work in the NCP3420MNR2G?
The bootstrap circuit uses an external diode and capacitor to generate the gate voltage for the high-side driver, ensuring proper operation of the high-side MOSFET.
- What is the maximum junction temperature for the NCP3420MNR2G?
The maximum junction temperature is 150°C.
- How does the output disable feature work?
Applying a low logic level to the Output Disable (OD) pin forces both DRVH and DRVL outputs low, disabling normal operation.
- What is the recommended capacitor value for the bootstrap circuit?
The recommended capacitor value is between 100 nF and 1.0 μF.
- What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature ensures that both driver outputs are low when the supply voltage is below a certain threshold, preventing improper operation.
