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onsemi NCP3286MNTXG
- Part No.:
- NCP3286MNTXG
- Manufacturer:
- onsemi
- Package:
- 34-PowerWFQFN
- Datasheet:
-
NCP3286MNTXG.pdf
- Description:
- IC REG BUCK ADJ 40A 34WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
NCP3286MNTXG from onsemi is a 40 A stackable synchronous buck regulator with PMBus interface, operating from 3 V to 18 V input and delivering 0.5 V–5.5 V output with remote sense. It uses fixed-frequency current-mode control for fast transient response and supports up to 160 A via 2–4 parallel phases in telecom baseband, server POL, and high-density DC/DC modules.
For engineers reviewing the NCP3286MNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include programmable valley current limit (8–70 A), PMBus-addressable multi-phase synchronization, thermal fault thresholds (80–160 °C), and integrated 5 V LDO or external VCC support - all validated for high-current, digitally managed point-of-load systems.
Technical Context
The NCP3286MNTXG implements fixed-frequency current-mode PWM control with programmable switching frequency (200–2000 kHz) and interleaved phase synchronization via SYNC/MODE2 pin. Its dual-loop architecture combines voltage regulation (FB/VSNS−) with real-time current monitoring (IMON/ILIM) and digital telemetry reporting over PMBus.
It supports master/slave configuration through FB and VSNS− pin voltage states, enabling precise current sharing across up to four phases. Protection logic includes configurable latch-off or hiccup mode, programmable OVP/UVP thresholds (±2% accuracy), and thermal shutdown at 170 °C with 155 °C restart.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 18 V - supports wide-input industrial and telecom supplies; operation below 4.5 V requires external 5 V VCC. |
| Output Current | 40 A continuous per device - scalable to 160 A using 2–4 stacked units with interleaved timing for reduced ripple and thermal stress. |
| Output Voltage Range | 0.25 V to 5.5 V with remote sense - enables precision regulation at CPU/GPU core rails and FPGA I/O domains. |
| Switching Frequency | 200–2000 kHz programmable - allows optimization of efficiency vs. size trade-offs; default set by resistor on SYNC/MODE2 pin. |
| Valley Current Limit | 8–70 A programmable per phase - sets overcurrent protection threshold with ±10% accuracy across −40 °C to 150 °C. |
| PMBus Interface | Compliant with SMBus 3.0 - enables real-time telemetry (VOUT, IOUT, temperature), dynamic margining, and fault logging in server management systems. |
| Junction Temperature | −40 °C to 150 °C operating range - rated for high-power density applications with thermal derating above 125 °C. |
Pinout & Package
Package: WQFN-34 (5 mm × 7 mm, 0.5 mm pitch), Case 510CL, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1–3, 34) | Power Input | High-side MOSFET drain connection; bypassed to PGND with ≥22 µF ceramic capacitors for low-impedance input filtering. |
| PHASE (Pin 4) | Power Node | Switch node return path for high-side gate driver; connects internally to high-side MOSFET source. |
| BST (Pin 5) | Bootstrap Supply | Provides gate drive voltage for high-side FET; requires 0.22 µF ceramic capacitor to PHASE and series RBST resistor. |
| PGOOD (Pin 6) | Logic Output | Open-drain power-good signal indicating regulated output within ±2% window; asserts after soft-start completion. |
| GND / PGND (Pins 7, 16, 32–33) | Ground Reference | Separate analog (AGND) and power (PGND) grounds; PGND connects to low-side MOSFET source and must be low-impedance. |
| FB (Pin 8) | Analog Input | Inverting error amplifier input; used for remote voltage sensing and master/slave identification via voltage state. |
| COMP (Pin 9) | Analog Output | Error amplifier output; connects to external compensation network for loop stability tuning. |
| VSET/FAULT (Pin 13) | Analog I/O | Programs boot-up voltage via resistor-to-ground; outputs master fault signal during overcurrent or thermal events. |
| ADDR/SFAULT (Pin 14) | Analog I/O | Sets PMBus address via resistor-to-ground; outputs slave fault signal to master device. |
| SYNC/MODE2 (Pin 17) | Analog I/O | Master outputs synchronization clock; slave inputs clock; resistor-to-ground programs frequency and phase count. |
| ALERT# (Pin 18) | Logic Output | Open-drain PMBus alert signal; pulled low on bus errors, register faults, or telemetry alarms. |
| SDA / SCL (Pins 19–20) | Logic I/O | PMBus data and clock lines; support 10–400 kHz operation with built-in noise suppression and timeout detection. |
| EN (Pin 21) | Logic Input | Active-high enable; UVLO threshold programmable via external resistor divider for system-level sequencing. |
| VCC (Pin 22) | Power Output/Input | 5 V LDO output (or external supply input); powers internal controller; bypassed with ≥2.2 µF ceramic capacitor. |
| VIN (Pin 23) | Power Input | LDO input; requires ≥1.0 µF ceramic bypass to GND; tied to external 5 V supply when LDO disabled. |
| PVCC (Pin 24) | Power Input | Gate driver supply; bypassed with ≥4.7 µF/25 V ceramic capacitor to PGND for robust high-side drive. |
| GL (Pin 25) | Analog Output | Low-side MOSFET gate driver output; direct connection to external FET gate; no external components required. |
| SW (Pins 26–31) | Power Switch Node | Connects to external inductor; multiple pins reduce parasitic inductance and improve current sharing in high-current layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable Multi-Phase Architecture | Enables seamless scaling from 40 A to 160 A using 2–4 NCP3286MNTXG devices with automatic interleaving and current balancing. |
| Programmable Valley Current Limit | Per-phase current limit (8–70 A) set by resistor on IMON/ILIM pin, supporting precise overcurrent protection and thermal management. |
| Remote Differential Voltage Sense | VSNS− and FB pins support Kelvin sensing to eliminate IR drop errors in high-current PCB traces, ensuring ±0.5% output accuracy. |
| Digital Telemetry via PMBus | Real-time reporting of input/output voltage, output current (±2% accuracy at 40 A), junction temperature, and fault status for predictive maintenance. |
| Configurable Fault Response | Selectable latch-off or hiccup mode via IMON/ILIM resistor; hiccup delay programmable from 32–256 ms for controlled recovery after overload. |
| Pre-Bias Start-Up Support | Allows safe turn-on into pre-biased output rails without reverse current flow - critical for hot-swap and redundant power systems. |
Applications
| Telecom Radio Unit | Server Point-of-Load |
|---|---|
Use Scenario: Powering RF transceivers and beamforming ICs in 5G massive MIMO base stations requiring stable 1.2 V/20 A rails under rapid load transients. IC Role / Device Role / Timing Role: Primary POL regulator with PMBus telemetry for real-time thermal and current monitoring across distributed antenna units. Use Value: Interleaved 2-phase stacking reduces output ripple by >60% vs. single-phase, improving RF signal integrity and reducing EMI filter size. | Use Scenario: Delivering 0.8 V/40 A to high-performance CPUs in rack-mounted servers with strict voltage tolerance (±1%) and dynamic load steps. IC Role / Device Role / Timing Role: Digitally managed core rail regulator with PMBus-based dynamic voltage scaling and fault logging for BMC integration. Use Value: Programmable soft-start (1–20 ms) and pre-bias start-up ensure glitch-free boot in multi-rail server power trees. |
| Networking Switch ASIC | High-Density DC/DC Module |
Use Scenario: Supplying 1.8 V/35 A to packet processing ASICs in 100 GbE switches with tight thermal constraints and space limitations. IC Role / Device Role / Timing Role: High-current POL controller with remote sense and thermal warning (130 °C) to prevent throttling during sustained traffic bursts. Use Value: Integrated 5 V LDO eliminates need for external bias supply, reducing BOM count and layout area in compact switch line cards. | Use Scenario: Embedded as the main regulator in 50 × 50 mm quarter-brick DC/DC modules targeting 12 V input to 3.3 V/80 A output. IC Role / Device Role / Timing Role: Stackable buck controller enabling modular design with identical NCP3286MNTXG units across multiple module variants. Use Value: Identical pinout and programming interface across all phases simplifies design reuse and reduces qualification time for new module SKUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2960GQZ-0000-P | 40 A monolithic buck with PMBus; lacks stackability beyond dual-phase; lower max VIN (16 V) and no remote sense. | Best suited for single-rail, non-interleaved designs where board space is more constrained than current scalability. | Select MP2960GQZ-0000-P only if multi-phase stacking is unnecessary and 16 V max input suffices. |
| TPS546D24RQFR | 40 A buck with PMBus; supports up to 6-phase stacking but uses different pinout and lacks pre-bias start-up. | Preferred for TI-ecosystem designs requiring higher phase count and tighter voltage margins (±0.25%), but not for legacy pre-biased systems. | Choose TPS546D24RQFR when designing new platforms with TI's Fusion Digital Power tools and no pre-bias requirement. |
Compared with MP2960GQZ-0000-P and TPS546D24RQFR, the NCP3286MNTXG uniquely combines 4-phase stackability, remote differential sensing, and guaranteed pre-bias start-up - making it the only option validated for telecom radio units with hot-swap power delivery and stringent thermal telemetry.
Availability
NCP3286MNTXG is available at Aetrix Electronics and suitable for telecom radio units, server point-of-load systems, and high-density DC/DC modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and infrastructure deployments.
Supply support for NCP3286MNTXG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.
The NCP3286MNTXG belongs to onsemi's high-current digital POL regulator product line, designed specifically for next-generation telecom infrastructure, AI-accelerator power delivery, and modular DC/DC systems demanding precise telemetry and scalable current capacity.
FAQ
What is the maximum output current achievable with a single NCP3286MNTXG?
A single NCP3286MNTXG delivers up to 40 A continuous output current. This rating assumes proper thermal management on a 2 oz copper PCB with adequate airflow or heatsinking. The device's 150 °C maximum junction temperature and 1.5 °C/W thermal resistance to PCB allow sustained 40 A operation under typical telecom and server ambient conditions. Derating applies above 85 °C ambient.
Does the NCP3286MNTXG support remote voltage sensing?
Yes, the NCP3286MNTXG supports true remote differential voltage sensing using the FB and VSNS− pins. This configuration compensates for IR drop across PCB traces and connectors, maintaining ±0.5% output regulation accuracy at the load. The VSNS− pin connects directly to the remote ground reference point, while FB connects to the remote positive sense point - enabling precision regulation in high-current, distributed power architectures.
How is multi-phase synchronization implemented in the NCP3286MNTXG?
Multi-phase synchronization in the NCP3286MNTXG is implemented via the SYNC/MODE2 pin: the master device outputs a clock signal, while slaves accept it as an input. Phase offset is automatically calculated based on the number of devices (2–4) and programmed via resistor values on SYNC/MODE2 and ADDR/SFAULT pins. No external clock generator is needed - the architecture ensures precise interleaving and current balancing across all phases without firmware intervention.
Can the NCP3286MNTXG operate without the integrated 5 V LDO?
Yes, the NCP3286MNTXG can operate with an external 5 V supply applied to both VIN and VCC pins, disabling the internal LDO. This mode is required for input voltages below 4.5 V and improves efficiency in systems where a clean, low-noise 5 V rail is already available. When using external VCC, the LDO-related quiescent current (7–9 mA) is eliminated, reducing total system power loss.
What protection features does the NCP3286MNTXG provide against overcurrent events?
The NCP3286MNTXG provides cycle-by-cycle valley current limiting with programmable thresholds (8–70 A), plus overcurrent fault response modes (latch-off or hiccup). It also includes negative current limiting (−45 A) for reverse conduction protection and configurable de-bounce timing (32/FSW seconds) to reject false triggers. All protections are hardware-based and fully operational before PMBus initialization, ensuring robustness during startup and fault conditions.
NCP3286MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 34-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):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 40A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-WQFN (5x7)
NCP3286MNTXG FAQ
1.How can I place an order for NCP3286MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3286MNTXG 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 NCP3286MNTXG reliable?
The price and inventory of NCP3286MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3286MNTXG is usually 5 days.
3.What payment methods are accepted for NCP3286MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3286MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3286MNTXG?
NCP3286MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3286MNTXG 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 NCP3286MNTXG?
For technical support, including NCP3286MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3286MNTXG requirements.
6.How does Aetrix verify that NCP3286MNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3286MNTXG 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 NCP3286MNTXG meets industry standards.
7.What is the process for return or replacement of NCP3286MNTXG?
All NCP3286MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3286MNTXG, 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 NCP3286MNTXG part is unused and in its original packaging.
Return procedure for NCP3286MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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