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onsemi NCP3284AMNTXG
- Part No.:
- NCP3284AMNTXG
- Manufacturer:
- onsemi
- Package:
- 37-PowerWFQFN
- Datasheet:
-
NCP3284AMNTXG.pdf
- Description:
- IC REG BUCK ADJ 35A 37PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:888
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Product details
Overview
NCP3284AMNTXG from onsemi is a single-phase synchronous buck voltage regulator with integrated high- and low-side power MOSFETs, delivering up to 35 A continuous output current, supporting 0.8 V–5.5 V adjustable output voltage via remote sensing, and operating at switching frequencies up to 1 MHz. It serves as a compact, high-efficiency point-of-load (POL) power stage in server VRMs and telecom infrastructure.
For engineers reviewing the NCP3284AMNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its programmable valley current limit (up to 49.5 A), selectable forced CCM/auto DCM operation mode, differential voltage sense architecture, and thermal shutdown recovery at 125 °C - all critical for stable high-current DC-DC conversion in thermally constrained environments.
Technical Context
The NCP3284AMNTXG implements current-mode Ramp-Pulse-Modulation (RPM) control with cycle-by-cycle valley current limiting and adaptive soft-start timing. Its integrated gate drivers support bootstrap high-side drive with dedicated PHASE and BOOT pins, while the MODE/FSET pin configures both switching frequency (500/600/800/1000 kHz) and operation mode (FCCM or Auto CCM/DCM).
Differential remote sensing (VSNS−/FB) enables precise regulation under load transients, and protection logic includes recoverable thermal shutdown (150 °C trip, 125 °C recovery), programmable hiccup/latch-off behavior via HICCUP# pin, and fast/slow UVP thresholds tied to FB and COMP nodes respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 35 A continuous (TDC), 50 A pulsed - supports high-power CPU/GPU core rails without external MOSFETs. |
| Input Voltage Range | 4.5 V–18 V with input feedforward - accommodates 5 V, 12 V, and 15 V intermediate bus architectures. |
| Output Voltage Range | 0.8 V–5.5 V with remote sense - enables tight regulation for sub-1 V ASIC cores and 3.3 V/5 V I/O rails. |
| Switching Frequency | 500/600/800/1000 kHz - allows optimization of inductor size vs. efficiency across load conditions. |
| Current Limit Accuracy | ±10% over −40 °C to 125 °C - ensures consistent OCP triggering across industrial temperature range. |
| Thermal Shutdown | 150 °C trip, 125 °C recovery - provides safe, self-resetting protection during sustained overload or airflow loss. |
| Package Thermal Resistance | RJA = 26.7 °C/W (4-layer PCB) - informs heatsink and layout requirements for 35 A operation. |
Pinout & Package
PQFN37 package, 5 mm × 6 mm, 0.5 mm pitch, exposed thermal pad (Case 483BZ). Designed for high-current power delivery with 8 SW pins, 5 PVIN pins, and 4 PGND pins to minimize parasitic inductance and enhance thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Analog Output | Valley current limit programming node - resistor to AGND sets OCP threshold (e.g., 33.2 kΩ → 49.5 A for NCP3284A). |
| 2 PGOOD | Logic Output | Open-drain power-good indicator - asserts high when output is within ±1% of target after soft-start completes. |
| 3 VIN | Power Input | LDO input supply - bypassed with ≥1 µF ceramic cap; shorted to VDRV disables internal 5 V LDO. |
| 4 VCC | Analog Power | Controller core 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 - internal connection only; no external routing required. |
| 7–10,19 PGND | Power Ground | Source return for internal low-side MOSFET - must be connected directly to system power ground plane. |
| 11–18 SW | Power Bidirectional | Switch node interconnect - connects internally to HS/LS MOSFET junction; ties externally to inductor. |
| 20–24 PVIN | Power Input | High-side MOSFET drain supply - bypassed with ≥22 µF ceramic caps close to pins to suppress input ripple. |
| 25 PHASE | Power Return | High-side gate driver return path - internally tied to HS MOSFET source; connects externally to BOOT capacitor. |
| 26 BOOT | Power Bidirectional | Bootstrap supply for high-side driver - requires 0.22 µF/25 V ceramic cap between BOOT and PHASE. |
| 27 EN | Logic Input | Enable control with programmable UVLO - resistor divider from PVIN sets input supply UVLO thresholds. |
| 28 VOS | Analog Input | Remote voltage sense positive - connects to VOUT via 1 kΩ series resistor for Kelvin sensing. |
| 29 SS | Analog Input | Soft-start ramp rate control - resistor to AGND programs TSS (1.1–8.8 ms range). |
| 30 FB | Analog Input | Inverting error amplifier input - regulated at 800 mV ±5 mV; used with VSNS− for differential feedback. |
| 31 VSNS− | Analog Input | Remote voltage sense negative - connects to system ground reference point for accurate load regulation. |
| 32 AGND | Analog Ground | Controller analog reference - must be connected to system ground with low-inductance path near VCC/VDRV. |
| 33–34 NC | No Connection | No internal connection - must remain unconnected per datasheet. |
| 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 configuration - resistor to AGND selects 500/600/800/1000 kHz and FCCM/Auto CCM-DCM. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Remote Sensing | VSNS−/FB inputs enable <1% output regulation accuracy under board trace IR drop and load transient conditions. |
| Programmable Valley Current Limit | Resistor-programmed OCP (18–49.5 A range) with ±10% accuracy ensures predictable fault response across temperature. |
| Selectably Forced CCM or Auto DCM/CCM | Enables high light-load efficiency (PFM in DCM) while maintaining fixed-frequency stability (FCCM) for EMI control. |
| Integrated 5 V LDO for Gate Drivers | Eliminates need for external bias supply; supports VDRV sourcing up to 30 mA with 200 mV dropout at 50 mA. |
| Comprehensive Protection Suite | Includes recoverable thermal shutdown, fast/slow UVP, OVP with DAC ramp-down, and configurable hiccup/latch-off. |
| Pre-Biased Soft Start | Supports safe startup into pre-charged outputs without reverse current flow or output overshoot. |
Applications
| Server Core VRM | Telecom Line Card POL |
|---|---|
|
Use Scenario: Delivering 0.85 V @ 30–35 A to high-performance x86 CPU cores in 1U rack servers with strict thermal envelope. IC Role / Device Role / Timing Role: Primary synchronous buck controller + integrated power stage; regulates output using differential remote sense and RPM modulation. Use Value: PQFN37 thermal performance and 35 A TDC rating eliminate need for multi-phase controllers, reducing BOM count and layout area by >40%. |
Use Scenario: Generating 3.3 V @ 15 A for FPGA, SerDes, and packet processor rails on dense telecom line cards with limited airflow. IC Role / Device Role / Timing Role: High-efficiency POL regulator with programmable soft-start and hiccup-mode OCP for field-replaceable modules. Use Value: 1 MHz switching enables use of 0.47 µH inductors, cutting solution size by 35% versus 500 kHz alternatives while maintaining >92% peak efficiency. |
| Storage System Memory Rail | Industrial Edge AI Accelerator |
|
Use Scenario: Supplying 1.2 V @ 25 A to DDR5 memory subsystems in NVMe SSD controllers with tight voltage tolerance (±3%). IC Role / Device Role / Timing Role: Precision-regulated buck converter with 800 mV FB reference and differential sensing for sub-10 mV load regulation error. Use Value: VSNS−/FB Kelvin pair rejects PCB copper resistance effects, ensuring ±0.5% output accuracy across full 0–35 A load range. |
Use Scenario: Powering 0.75 V @ 20 A AI inference accelerators in fanless edge gateways operating at −40 °C to 85 °C ambient. IC Role / Device Role / Timing Role: Robust DC-DC stage with thermal shutdown recovery and −40 °C to 125 °C junction-rated protections. Use Value: RJA = 26.7 °C/W and 150 °C TSD threshold allow continuous 20 A operation without derating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315GJ-Z | 30 A rated, 4.5–18 V input, but lacks differential remote sensing and has fixed 600 kHz frequency. | Suitable for cost-sensitive, non-critical POL where ±1% regulation is acceptable and layout space permits larger inductors. | Choose MP2315GJ-Z only if differential sensing and programmable frequency are not required; verify thermal margin at 35 A. |
| TPS546D24RQFPR | 40 A rated, PMBus-enabled, with digital loop compensation - significantly higher BOM cost and design complexity. | Required for systems needing telemetry, dynamic voltage scaling, or multi-rail sequencing via digital interface. | Select TPS546D24RQFPR when digital control, telemetry, or tighter transient response (<10 µs) is mandatory; avoid for analog-only designs. |
Compared with MP2315GJ-Z, NCP3284AMNTXG delivers superior load regulation via differential sensing and greater flexibility with 4-frequency selection; versus TPS546D24RQFPR, it offers lower system cost and simpler layout at the expense of digital configurability.
Availability
NCP3284AMNTXG is available at Aetrix Electronics and suitable for server VRMs, telecom line cards, and industrial edge AI accelerators requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for NCP3284AMNTXG 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The NCP3284AMNTXG belongs to onsemi's high-current integrated buck regulator product line, engineered specifically for compact, high-efficiency point-of-load conversion in data center and networking equipment where thermal density and regulation precision are critical.
FAQ
What is the maximum continuous output current rating for the NCP3284AMNTXG?
The NCP3284AMNTXG is rated for 35 A continuous (TDC) output current under specified thermal conditions, as confirmed in the device ordering information and electrical characteristics tables. This rating applies across the full 0.8 V–5.5 V output range and is validated with proper PCB thermal design per the datasheet layout guidelines. The NCP3284AMNTXG achieves this with integrated MOSFETs and a PQFN37 package optimized for high-current power delivery.
Does the NCP3284AMNTXG support remote voltage sensing, and how is it implemented?
Yes, the NCP3284AMNTXG supports true differential remote voltage sensing using dedicated VSNS− and FB pins. VSNS− connects to the system ground reference point near the load, while FB connects to the regulated output through a 1 kΩ series resistor. This Kelvin-sense configuration rejects PCB trace resistance errors, enabling ±0.5% load regulation accuracy. The NCP3284AMNTXG's internal error amplifier compares the differential signal to an 800 mV reference, ensuring precise regulation independent of board-level IR drops.
How is the switching frequency programmed on the NCP3284AMNTXG?
The switching frequency of the NCP3284AMNTXG is set via a resistor connected from the MODE/FSET pin (pin 36) to AGND. Specific resistor values configure both frequency (500/600/800/1000 kHz) and operation mode (Forced CCM or Auto CCM/DCM), as defined in Table 1 of the datasheet. For example, a 2.49 kΩ ±1% resistor selects 1000 kHz in Forced CCM mode, while a 12.1 kΩ resistor selects 800 kHz in Auto CCM/DCM mode. The NCP3284AMNTXG's internal current source (50 µA typical) converts resistance to frequency with minimal external components.
What protection features does the NCP3284AMNTXG include, and how are they configured?
The NCP3284AMNTXG integrates over-current (OCP), under-voltage (UVP), over-voltage (OVP), and thermal shutdown (TSD) protections. OCP uses valley current limiting with resistor-programmed thresholds (e.g., 33.2 kΩ → 49.5 A). UVP has dual thresholds (fast 0.2 V, slow 3.0 V), while OVP triggers at 1.0 V FB with 10 mV hysteresis. TSD trips at 150 °C and recovers at 125 °C. Pin 35 (HICCUP#) selects latch-off (floating) or hiccup (grounded) behavior for all protections. These features are fully documented in the NCP3284AMNTXG datasheet Sections 7–10.
Can the NCP3284AMNTXG operate with an external 5 V supply instead of its internal LDO?
Yes, the NCP3284AMNTXG supports external 5 V bias for VDRV and VCC by shorting pin 3 (VIN) to pin 5 (VDRV), which disables the internal 5 V LDO. In this configuration, the external 5 V supply must meet VDRV specifications (4.8–5.4 V, ≤50 mA load) and be applied before PVIN to ensure proper gate driver operation. Figure 2 in the NCP3284AMNTXG datasheet shows the recommended circuit, and the LDO disable function is explicitly verified in the "PIN DESCRIPTION" table for pin 3.
NCP3284AMNTXG 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):
- 5.5V
- Current - Output:
- 35A
- 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)
NCP3284AMNTXG FAQ
1.How can I place an order for NCP3284AMNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3284AMNTXG 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 NCP3284AMNTXG reliable?
The price and inventory of NCP3284AMNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3284AMNTXG is usually 5 days.
3.What payment methods are accepted for NCP3284AMNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3284AMNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3284AMNTXG?
NCP3284AMNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3284AMNTXG 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 NCP3284AMNTXG?
For technical support, including NCP3284AMNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3284AMNTXG requirements.
6.How does Aetrix verify that NCP3284AMNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3284AMNTXG 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 NCP3284AMNTXG meets industry standards.
7.What is the process for return or replacement of NCP3284AMNTXG?
All NCP3284AMNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3284AMNTXG, 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 NCP3284AMNTXG part is unused and in its original packaging.
Return procedure for NCP3284AMNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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