Item specifics
Description
The NCP3284AMNTXG is a single-phase synchronous buck regulator from onsemi, integrating high-efficiency power MOSFETs in a thermally enhanced PQFN-37 (5×6mm) package. It operates from a 4.5V to 18V input voltage range with an adjustable output voltage from 0.8V to 5.5V, delivering up to 35A continuous output current (50A pulsed) with selectable switching frequencies of 500kHz / 600kHz / 800kHz / 1MHz. The device features input feedforward, differential remote voltage sense, programmable soft-start, and comprehensive protection functions, specifically optimized for point-of-load (POL) power, telecom and networking equipment, server and storage systems, and computing applications.
| Part number | NCP3284AMNTXG |
| Device Type | Single-Phase Synchronous Buck Regulator |
| Topology | Synchronous Buck |
| Control Mode | Enhanced Ramp Pulse Modulation (COT) |
| Input Voltage Range | 4.5V ~ 18V |
| Output Voltage Range | 0.8V ~ 5.5V (Adjustable) |
| Output Current (Continuous) | 35 A (NCP3284A) / 30 A (NCP3284) |
| Output Current (Pulsed) | 50 A (NCP3284A) / 45 A (NCP3284) |
| Switching Frequency | 500kHz / 600kHz / 800kHz / 1MHz (Selectable) |
| Output Voltage Accuracy | 0.6% (Reference) |
| Efficiency (Typical) | 96% |
| Quiescent Current | 6.4 mA |
| Switch | Built-in |
| Synchronous Rectifier | Yes |
| Voltage Sense | Differential Remote Sense |
| Supply | Internal 5V LDO or External 5V |
| Soft-Start | Programmable |
| Protections | Programmable Current Limit, UVP, OVP, Recoverable Thermal Shutdown, Selectable Protection Mode |
| Other Features | Power Good Indicator, Programmable VIN UVLO Enable, Output Discharge in Shutdown |
| Operating TJ | -40℃ ~ +125℃ |
| Package | PQFN-37-EP(5×6mm, 0.5mm Pitch) |
Server and data center point-of-load (POL) power
Networking and telecom system power
ASIC and FPGA core voltage supply
Storage device power
Distributed power architecture POL converters
Industrial automation and embedded system power
FAQ
Q: What is the difference between NCP3284AMNTXG and NCP3284MNTXG?
A: Both share the same PQFN-37 package with essentially identical core parameters. The primary difference is output current capability: NCP3284AMNTXG delivers 35A continuous (50A pulsed), while NCP3284MNTXG delivers 30A continuous (45A pulsed). Select based on load current requirements.
Q: How is the switching frequency selected?
A: Switching frequency is selectable via external resistor at 500kHz, 600kHz, 800kHz, and 1MHz. Higher frequencies allow smaller inductors and capacitors for reduced solution size; lower frequencies reduce switching losses for higher efficiency.
Q: What protection features are integrated?
A: Programmable current limit, under-voltage protection (UVP), over-voltage protection (OVP), recoverable thermal shutdown, and selectable protection mode (latch-off or hiccup). A Power Good indicator and programmable VIN UVLO enable are also provided.
Q: Does it support remote voltage sensing?
A: Yes. The device provides differential remote voltage sense to compensate for PCB trace impedance voltage drops, ensuring precise voltage regulation at the load — ideal for ASIC and FPGA power supply applications requiring high voltage accuracy.
Q: How is the efficiency performance?
A: Typical efficiency reaches 96%, benefiting from integrated low-RDS(on) power MOSFETs and the patented enhanced ramp pulse modulation control architecture. At light loads, auto DCM/CCM mode can be selected to maintain high efficiency.
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