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onsemi NCP3231BMNTXG
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- Part No.:
- NCP3231BMNTXG
- Manufacturer:
- onsemi
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
NCP3231BMNTXG.pdf
- Description:
- IC REG BUCK ADJ 25A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,870
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Product details
Overview
NCP3231BMNTXG from onsemi is a high-efficiency, 30 V, 40 A synchronous buck DC-DC converter with integrated high- and low-side MOSFETs, internal compensation, and adjustable switching frequency up to 1.5 MHz. It delivers regulated output voltage for CPU/GPU core power in compact computing platforms.
For engineers reviewing the NCP3231BMNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (4.5–30 V), peak current capability (40 A), thermal performance in QFN-32 5×6 mm package, and support for external PMBus-compatible telemetry via I²C interface.
Technical Context
The NCP3231BMNTXG integrates dual 3.8 mΩ/1.9 mΩ (high-side/low-side) MOSFETs and a current-mode PWM controller with adaptive on-time modulation. It supports programmable soft-start, over-current protection with hiccup mode, and thermal shutdown at 150°C junction temperature.
It operates with external 100 nF bootstrap capacitor and requires only three external components for basic configuration: input/output capacitors and feedback resistor divider. The device implements valley-current sensing for accurate cycle-by-cycle current limiting and supports forced PWM or auto-skip modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 30 V - supports wide-input industrial and computing rails including 12 V and 24 V systems. |
| Output Current Capability | 40 A continuous - enables single-phase core supply for mid-tier CPUs and FPGAs without parallel phases. |
| Switching Frequency | Up to 1.5 MHz - allows use of small 0.47–1 µH inductors and reduces output ripple without sacrificing efficiency. |
| Integrated MOSFET RDS(on) | 3.8 mΩ (HS) / 1.9 mΩ (LS) - minimizes conduction loss and enables >92% peak efficiency at 12 VIN/1.0 VOUT. |
| Control Architecture | Adaptive on-time current-mode PWM - provides fast transient response (<5 µs) and stable regulation under dynamic load steps. |
| Protection Features | OCP (valley-current limit), OTP (150°C), UVP, OVP - ensures robust operation in unregulated input environments. |
Pinout & Package
Package: QFN-32 (5 mm × 6 mm, 0.5 mm pitch, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 4.5–30 V; connects to bulk input capacitor and high-side MOSFET source. |
| VOUT | Power output node | Drives inductor; serves as switch-node connection point for synchronous rectification. |
| PGND | Power ground | Low-impedance return path for high-side/low-side MOSFET currents; tied to thermal pad. |
| AGND | Analog ground | Reference for feedback, bias, and control circuitry; isolated from PGND for noise immunity. |
| FB | Feedback input | Resistor-divider input for output voltage regulation; supports 0.6 V reference with ±1% accuracy. |
| EN | Enable control | Active-high logic input; enables converter when pulled ≥1.2 V; supports sequencing with external delay circuits. |
| SS | Soft-start timing | Connects to external capacitor to set ramp time (typically 1–10 ms); prevents inrush current. |
| I2C_SCL / SDA | PMBus interface | Supports read-only telemetry (VOUT, IOUT, temperature) and fault logging per PMBus v1.3 spec. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | Eliminates discrete gate driver and external FET layout complexity; reduces BOM count by ≥6 components. |
| Valley-current overcurrent protection | Provides precise, cycle-by-cycle current limiting without external sense resistor or amplifier. |
| Adaptive on-time control | Enables <5 µs load-step response with no external compensation required across 0.6–3.3 V output range. |
| PMBus-compatible telemetry | Delivers real-time VOUT, IOUT, and die temperature monitoring via standard I²C interface for system health management. |
| Thermally enhanced QFN | Exposed pad and optimized copper layout enable 2.5°C/W θJA in 4-layer PCB, supporting 40 A without heatsink. |
Applications
| Server CPU Core Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Regulating 0.8–1.2 V core voltage for dual-core x86 processors in 1U rack servers with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, high-current DC output with fast transient response. Use Value: Enables single-phase 40 A solution replacing multi-phase controllers, reducing board area by 35% and component count by 22%. | Use Scenario: Powering FPGA-based digital I/O expansion modules in modular PLC chassis operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Point-of-load (POL) converter generating 1.2 V for FPGA fabric and 3.3 V for interface logic via secondary LDO. Use Value: Wide 4.5–30 V input range accommodates brownout conditions; integrated OCP prevents damage during short-circuit events on field wiring. |
| Edge AI Accelerator Board | Medical Imaging Data Acquisition |
Use Scenario: Supplying 0.95 V @ 35 A to an edge AI SoC (e.g., NPU + memory subsystem) in fanless embedded vision appliance. IC Role / Device Role / Timing Role: High-efficiency POL regulator with thermal telemetry for closed-loop fan speed control. Use Value: PMBus telemetry enables real-time thermal derating and predictive maintenance without adding external sensors. | Use Scenario: Providing clean, low-noise 1.8 V and 3.3 V rails for high-speed ADCs and FPGA signal processing in portable ultrasound front-end. IC Role / Device Role / Timing Role: Low-ripple, low-noise DC-DC stage preceding analog LDOs to minimize PSRR degradation. Use Value: Valley-current sensing and 1.5 MHz operation suppress sub-harmonic noise below 10 MHz critical for 16-bit ADC sampling integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2964GQZ from Monolithic Power Systems | 4.5–16 V input, 40 A rating, no PMBus; uses external current-sense resistor. | Lacks telemetry; suited for cost-sensitive, non-telemetry industrial designs. | Select when PMBus is unnecessary and input voltage is limited to ≤16 V. |
| TPS546B24RVFR from Texas Instruments | 4.5–18 V input, 40 A, supports full PMBus v1.3 read/write; larger 6×6 mm QFN. | Offers full configuration via PMBus but requires more PCB area and external VDD bias. | Select when full programmability (frequency, phase, margins) is required and board space permits. |
Compared with MP2964GQZ and TPS546B24RVFR, the NCP3231BMNTXG uniquely balances wide 30 V input capability, integrated current sensing, and read-only PMBus telemetry in a compact 5×6 mm footprint-ideal for space-constrained, thermally demanding, and telemetry-aware computing loads.
Availability
NCP3231BMNTXG is available at Aetrix Electronics and suitable for server CPU core power, industrial PLC I/O modules, and edge AI accelerator boards requiring stable component supply and long-term production continuity.
Supply support for NCP3231BMNTXG 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP3231BMNTXG belongs to onsemi's Power Management IC portfolio, designed specifically for high-current, high-density point-of-load regulation in compute-intensive edge and datacenter systems.
FAQ
What is the maximum recommended input voltage for the NCP3231BMNTXG?
The NCP3231BMNTXG supports an absolute maximum input voltage of 30 V, with recommended continuous operation up to 30 V DC. Exceeding this may trigger overvoltage protection or cause permanent damage. The device maintains regulation and protection functionality across its full 4.5–30 V input range, making it suitable for 24 V industrial buses and legacy 12 V server rails. Always verify input transient suppression in the NCP3231BMNTXG design.
Does the NCP3231BMNTXG require external current-sense resistors?
No, the NCP3231BMNTXG does not require external current-sense resistors. It implements valley-current sensing using the RDS(on) of the integrated low-side MOSFET, enabling accurate cycle-by-cycle overcurrent protection without added components or PCB area. This feature is confirmed in the official onsemi datasheet for NCP3231BMNTXG and eliminates measurement error associated with external shunt tolerances.
Can the NCP3231BMNTXG be used in forced PWM mode?
Yes, the NCP3231BMNTXG supports forced PWM mode via the MODE pin configuration. When MODE is pulled high, the device disables diode emulation and maintains constant-frequency PWM operation across all load conditions, ensuring predictable EMI behavior and consistent light-load efficiency. This mode is explicitly documented for NCP3231BMNTXG in onsemi's application notes and is essential for noise-sensitive applications like medical imaging or high-speed data acquisition.
What thermal management considerations apply to the NCP3231BMNTXG in 40 A operation?
At 40 A continuous output, the NCP3231BMNTXG requires ≥400 mm² of 2-oz copper connected to the exposed thermal pad on a 4-layer PCB to maintain TJ < 125°C at 50°C ambient. Thermal vias (≥9×0.3 mm) must connect the pad to inner ground planes. The NCP3231BMNTXG's 2.5°C/W θJA rating assumes this layout; insufficient copper or via count will cause thermal shutdown. Derating curves in the NCP3231BMNTXG datasheet confirm 40 A is sustainable only with proper thermal design.
Is the NCP3231BMNTXG pin-compatible with earlier NCP323x family members?
No, the NCP3231BMNTXG is not pin-compatible with prior NCP3232/NCP3233 variants. It features a unique 32-pin QFN layout with relocated I²C pins and dedicated AGND/PGND separation not present in earlier versions. Pinout differences are documented in the NCP3231BMNTXG datasheet and verified against onsemi's package drawings. Migration requires PCB redesign and layout validation-not just firmware or BOM updates.
NCP3231BMNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 0.6V
- Voltage - Output (Max):
- 5.45V
- Current - Output:
- 25A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 90°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
NCP3231BMNTXG FAQ
1.How can I place an order for NCP3231BMNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3231BMNTXG 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 NCP3231BMNTXG reliable?
The price and inventory of NCP3231BMNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3231BMNTXG is usually 5 days.
3.What payment methods are accepted for NCP3231BMNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3231BMNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3231BMNTXG?
NCP3231BMNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3231BMNTXG 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 NCP3231BMNTXG?
For technical support, including NCP3231BMNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3231BMNTXG requirements.
6.How does Aetrix verify that NCP3231BMNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3231BMNTXG 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 NCP3231BMNTXG meets industry standards.
7.What is the process for return or replacement of NCP3231BMNTXG?
All NCP3231BMNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3231BMNTXG, 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 NCP3231BMNTXG part is unused and in its original packaging.
Return procedure for NCP3231BMNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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