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onsemi NCP3284MNTXG
- Part No.:
- NCP3284MNTXG
- Manufacturer:
- onsemi
- Package:
- 37-PowerWFQFN
- Datasheet:
-
NCP3284MNTXG.pdf
- Description:
- IC REG BUCK ADJ 30A 37PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
NCP3284MNTXG from onsemi is a single-phase synchronous buck voltage regulator with integrated high- and low-side power MOSFETs, delivering up to 30 A continuous output current at 0.8–5.5 V output range, operating up to 1 MHz switching frequency, and featuring differential remote voltage sensing for precision regulation in point-of-load applications.
For engineers reviewing the NCP3284MNTXG datasheet, pinout, applications, or equivalent options, key selection considerations include programmable valley current limit (via ILIM resistor), selectable forced CCM or auto DCM/CCM mode for light-load efficiency, and configurable latch-off/hiccup protection via HICCUP# pin.
Technical Context
The NCP3284MNTXG implements current-mode Ramp-Pulse-Modulation (RPM) control with integrated gate drivers and a 5 V LDO for VDRV/VCC supply. It supports input feedforward compensation across 4.5–18 V VIN and enables precise output regulation via differential feedback (FB/VSNS−) with 800 mV ±5 mV reference voltage.
Operation mode (FCCM vs. Auto CCM/DCM) and switching frequency (500/600/800/1000 kHz) are set by a single resistor on MODE/FSET; soft-start slew rate is programmed via SS-to-AGND resistor; and over-current threshold is configured using an external resistor on ILIM with ±10% accuracy over −40 °C to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V - supports wide-input industrial and telecom power rails without external pre-regulation |
| VOUT Range | 0.8 V to 5.5 V - covers core voltages for CPUs, FPGAs, ASICs, and memory subsystems |
| Max Output Current | 30 A continuous - sufficient for high-power SoC point-of-load conversion with thermal derating |
| Switching Frequency | Up to 1 MHz - enables use of compact 0.22 µF bootstrap capacitor and small-area inductors |
| Feedback Reference | 800 mV ±5 mV - ensures tight output regulation under load transients and temperature variation |
| Current Limit Accuracy | ±10% over −40 °C to 125 °C - enables reliable over-current protection without excessive margin |
| Thermal Shutdown | 150 °C trip / 125 °C recovery - provides robust die-level thermal protection with hysteresis |
Pinout & Package
PQFN37 package, 5 mm × 6 mm, 0.5 mm pitch, exposed thermal pad (Case 483BZ). Designed for high-current PCB layouts with multiple PGND and PVIN pins to minimize parasitic inductance and enhance thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Analog Output | Valley current limit programming node - resistor to AGND sets OCP threshold (e.g., 24.9 kΩ = 36.5 A) |
| 2 PGOOD | Logic Output | Open-drain power-good indicator - asserts high when output is within ±1% regulation window |
| 3 VIN | Power Input | LDO input supply - bypassed with ≥1 µF ceramic cap; shorted to VDRV disables internal LDO |
| 4 VCC | Analog Power | Controller supply - requires ≥2.2 µF ceramic decoupling to AGND for stable PWM operation |
| 5 VDRV | Analog Power | Integrated 5 V LDO output - powers gate drivers; bypassed with ≥4.7 µF/25 V ceramic cap to PGND |
| 6 GL | Analog Output | Low-side MOSFET gate driver output - no external connection; internally tied to LS-FET source |
| 7–10,19 PGND | Power Ground | Power ground return for low-side MOSFET - must be connected directly to system ground plane |
| 11–18 SW | Power Bidirectional | Switch node - connects to inductor; shared interconnect between HS and LS internal MOSFETs |
| 20–24 PVIN | Power Input | High-side MOSFET drain supply - bypassed with ≥22 µF ceramic caps close to pins for low-ESL filtering |
| 25 PHASE | Power Return | High-side gate driver return - internally connected to HS-FET source; ties BOOT capacitor negative |
| 26 BOOT | Power Bidirectional | Bootstrap supply - requires 0.22 µF/25 V ceramic cap to PHASE for high-side gate drive voltage |
| 27 EN | Logic Input | Enable control with programmable UVLO - resistor divider configures input supply UVLO thresholds |
| 28 VOS | Analog Input | Remote sense positive - connects to VOUT via 1 kΩ series resistor for Kelvin sensing |
| 29 SS | Analog Input | Soft-start timing - resistor to AGND sets ramp duration (e.g., 4.53 kΩ = 1.1 ms) |
| 30 FB | Analog Input | Inverting error amplifier input - referenced to VSNS− for differential feedback loop stability |
| 31 VSNS− | Analog Input | Remote sense negative - connects to system ground near load for accurate voltage regulation |
| 32 AGND | Analog Ground | Analog reference ground - must be routed separately from PGND and tied to system ground at single point |
| 33–34 NC | - | No connection - left unconnected; not bonded or functional |
| 35 HICCUP# | Analog Input | Protection mode select - floating = latch-off; grounded = hiccup mode for OCP/UVP/OVP recovery |
| 36 MODE/FSET | Analog Input | Frequency and mode programming - resistor to AGND selects CCM/DCM behavior and fSW (500–1000 kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Differential Remote Voltage Sense | FB/VSNS− inputs eliminate IR drop errors in high-current POL designs, enabling ±0.5% output accuracy at load |
| Programmable Valley Current Limit | Resistor-based ILIM interface allows precise OCP setting (24.9 kΩ → 36.5 A) with ±10% tolerance over full temp range |
| Selective Operation Mode Control | FCCM or Auto CCM/DCM via MODE/FSET resistor - maintains high efficiency (>90%) at light loads without audible noise |
| Configurable Protection Response | HICCUP# pin selects latch-off (requires EN/VCC cycle) or hiccup (32 ms idle + auto-restart) for OCP/UVP/OVP events |
| Integrated 5 V LDO with External Bypass Option | VIN-to-VDRV LDO eliminates need for external bias supply; direct short to VDRV enables external 5 V sourcing for higher efficiency |
Applications
| Server CPU Core Supply | Telecom Line Card POL |
|---|---|
|
Use Scenario: Regulating 0.8–1.2 V at up to 30 A for dual-socket x86 server CPUs with fast load transients. IC Role / Device Role / Timing Role: Primary single-phase buck controller with integrated MOSFETs, differential sensing, and 1 MHz switching for minimal output capacitance. Use Value: Enables compact VR13-compatible design with <1.5% output deviation during 10–90% load steps and <500 ns response time. |
Use Scenario: Providing 3.3 V/25 A to FPGA and SerDes on high-density telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency POL regulator with programmable soft-start and hiccup-mode OCP for field-replaceable modules. Use Value: Reduces board area by 40% vs. discrete controller+MOSFET solutions while meeting EN55022 Class B conducted emissions. |
| Storage Controller Power | Industrial GPU Module Supply |
|
Use Scenario: Delivering 1.8 V/20 A to NVMe SSD controllers with thermal constraints in 1U rack enclosures. IC Role / Device Role / Timing Role: Synchronous buck regulator with thermal shutdown (150 °C) and remote sensing for stable rail under airflow-limited conditions. Use Value: Maintains regulation during 85 °C ambient operation with <10 °C junction rise above case due to PQFN37 thermal resistance (RJB = 0.9 °C/W). |
Use Scenario: Generating 0.9 V/28 A for embedded GPUs in ruggedized edge AI inference systems with wide input (9–18 V). IC Role / Device Role / Timing Role: Wide-VIN buck converter with input feedforward and programmable UVLO for automotive-grade 24 V nominal systems. Use Value: Supports cold-crank down to 4.5 V without dropout, and delivers >92% peak efficiency at 12 V input/0.9 V output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2384CGG-Z (Monolithic Power) | 30 A rated, but uses external MOSFETs; no integrated LDO; max fSW = 750 kHz; lacks differential sensing | Suitable for cost-sensitive designs where layout space allows discrete FETs and simpler feedback | Choose MP2384CGG-Z only if external MOSFET thermal management and lower-frequency magnetics are acceptable trade-offs |
| TPS546D24RQFPR (TI) | 40 A rated, PMBus-enabled, 3.3–16 V VIN, supports AVS and telemetry; larger 6×6 mm QFN package | Required for digital power systems needing dynamic voltage scaling and real-time monitoring | Select TPS546D24RQFPR when PMBus communication, AVS, or higher current headroom justifies added complexity and cost |
Compared with NCP3284MNTXG, MP2384CGG-Z requires external MOSFET layout and lacks remote sensing, increasing design risk for high-accuracy POL; TPS546D24RQFPR adds digital control overhead and footprint but enables closed-loop system-level power optimization.
Availability
NCP3284MNTXG is available at Aetrix Electronics and suitable for server and storage systems, telecom infrastructure equipment, and industrial computing platforms requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP3284MNTXG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi is a global semiconductor supplier focused on energy-efficient innovation, with leadership in power management, analog, sensors, and logic devices for automotive, industrial, cloud, and IoT markets.
The NCP3284MNTXG belongs to onsemi's high-current integrated buck regulator product line, engineered specifically for high-density point-of-load conversion in datacenter and networking equipment where thermal performance and layout simplicity are critical.
FAQ
What is the maximum continuous output current rating for the NCP3284MNTXG?
The NCP3284MNTXG is rated for up to 30 A continuous output current under typical thermal conditions (TA = 25 °C, 4-layer PCB, no airflow). This rating assumes proper layout with adequate copper pour, thermal vias under the exposed pad, and appropriate input/output capacitance per the datasheet layout guidelines. Derating applies at elevated ambient temperatures or reduced airflow.
Does the NCP3284MNTXG support remote voltage sensing, and how is it implemented?
Yes, the NCP3284MNTXG supports true differential remote voltage sensing using dedicated FB and VSNS− pins. The FB pin connects to the positive output rail through a 1 kΩ resistor, while VSNS− connects to the load's ground reference point - enabling cancellation of PCB trace IR drop. This configuration ensures regulation accuracy remains within ±0.5% across full load and temperature ranges.
How is the switching frequency and operation mode configured on the NCP3284MNTXG?
The NCP3284MNTXG uses a single resistor from MODE/FSET (pin 36) to AGND to configure both switching frequency (500/600/800/1000 kHz) and operation mode (Forced CCM or Auto CCM/DCM). For example, a 2.49 kΩ resistor sets 1000 kHz in Forced CCM mode, while a 12.1 kΩ resistor sets 800 kHz in Auto CCM/DCM mode. No external clock signal is required.
Can the NCP3284MNTXG operate with an external 5 V supply instead of its internal LDO?
Yes, the NCP3284MNTXG supports external 5 V supply for VDRV and VCC. To disable the internal LDO, connect VIN (pin 3) directly to VDRV (pin 5) with a short trace. This configuration reduces power loss and improves efficiency in systems where a clean, regulated 5 V rail is already available - confirmed in Figure 2 of the datasheet.
What protection features does the NCP3284MNTXG provide, and how are they configured?
The NCP3284MNTXG provides valley-current OCP, fast/slow UVP, OVP, thermal shutdown, and PGOOD monitoring. All protections are active during startup and normal operation. Protection response mode (latch-off vs. hiccup) is selected by leaving HICCUP# (pin 35) floating (latch-off) or grounding it (hiccup). Current limit threshold is set via ILIM (pin 1); UVLO thresholds are programmed using resistors on EN (pin 27).
NCP3284MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 37-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15.3V
- Current - Output:
- 30A
- Frequency - Switching:
- 500kHz, 600kHz, 800kHz, 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 100°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 37-PQFN (5x6)
NCP3284MNTXG FAQ
1.How can I place an order for NCP3284MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3284MNTXG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for NCP3284MNTXG reliable?
The price and inventory of NCP3284MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3284MNTXG is usually 5 days.
3.What payment methods are accepted for NCP3284MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3284MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3284MNTXG?
NCP3284MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3284MNTXG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for NCP3284MNTXG?
For technical support, including NCP3284MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3284MNTXG requirements.
6.How does Aetrix verify that NCP3284MNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3284MNTXG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCP3284MNTXG meets industry standards.
7.What is the process for return or replacement of NCP3284MNTXG?
All NCP3284MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3284MNTXG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The NCP3284MNTXG part is unused and in its original packaging.
Return procedure for NCP3284MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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