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onsemi NCP3120MNTXG
- Part No.:
- NCP3120MNTXG
- Manufacturer:
- onsemi
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
NCP3120MNTXG.pdf
- Description:
- IC REG BUCK ADJ 2A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
NCP3120MNTXG from onsemi is a high-efficiency, synchronous step-down DC-DC controller IC designed for 5 V to 12 V input industrial and computing power supplies. It delivers up to 20 A output current with programmable switching frequency (300 kHz to 2 MHz), integrated MOSFET drivers, and precision voltage regulation (±1% reference accuracy) in a thermally enhanced 20-pin QFN package.
For engineers reviewing the NCP3120MNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its adaptive on-time control architecture, external current-sense resistor support, overvoltage/overcurrent/thermal protection, and compatibility with low-ESR ceramic output capacitors in compact POL designs.
Technical Context
The NCP3120MNTXG implements adaptive on-time (AOT) control with internal slope compensation, enabling fast transient response without external loop compensation components. It supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) operation via automatic mode transition based on load conditions.
Its dual MOSFET gate drivers deliver 1.5 A peak sink/source capability with matched propagation delays (<20 ns skew), supporting high-side and low-side N-channel MOSFETs. The controller integrates a precision 0.6 V reference with ±1% tolerance over temperature and line, and features a dedicated power-good (PGOOD) signal with adjustable delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 13.2 V - Supports wide-input 5 V/12 V rail systems with margin for ripple and dropout. |
| Output Voltage Range | 0.6 V to 5.5 V - Programmable via external resistor divider; enables core voltage scaling for CPUs/FPGAs. |
| Max Output Current | 20 A - Achieved with external high-current MOSFETs; requires proper thermal layout and phase management. |
| Switching Frequency | 300 kHz to 2 MHz - Adjustable via RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| Reference Accuracy | ±1% (–40°C to +125°C) - Ensures tight output regulation across industrial temperature range. |
| Gate Drive Capability | 1.5 A sink/source per driver - Drives large gate-charge MOSFETs with minimal dead-time distortion. |
| Protection Features | OVP, UVP, OCP, TSD - Cycle-by-cycle current limiting and thermal shutdown prevent fault propagation. |
Pinout & Package
Package: 20-pin 4 mm × 4 mm QFN with exposed thermal pad (MN suffix). RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Connects to 4.5–13.2 V source; bypassed with ≥10 µF ceramic capacitor near pin. |
| BOOT | High-side gate driver bootstrap | Supplies floating voltage for high-side MOSFET gate drive; requires 0.1 µF ceramic bootstrap capacitor. |
| PHASE | Switch node | Connects to high-side MOSFET drain and low-side MOSFET source; critical for EMI and layout integrity. |
| LGATE | Low-side MOSFET gate driver output | Drives low-side N-channel MOSFET gate directly; 1.5 A peak drive strength ensures fast turn-on/off. |
| HGATE | High-side MOSFET gate driver output | Drives high-side N-channel MOSFET gate via bootstrap circuit; matched timing with LGATE minimizes shoot-through risk. |
| FB | Feedback input | Monitors output voltage via resistor divider; sets regulated output with 0.6 V reference threshold. |
| EN | Enable input | Active-high logic input; pulls low to disable regulator and enter ultra-low quiescent current state. |
| PGOOD | Power-good status output | Open-drain signal asserted after output reaches ±10% of target and remains stable for 2 ms. |
| RT | Frequency setting | Resistor-to-ground sets switching frequency from 300 kHz to 2 MHz; tolerance affects timing accuracy. |
| ISENSE+ | Current sense positive input | Connects to high-side of external current-sense resistor; enables cycle-by-cycle overcurrent protection. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive On-Time Control | Eliminates need for external compensation network; maintains stability across wide VIN/VOUT/load ranges. |
| Programmable Switching Frequency | 300 kHz–2 MHz via single RT resistor; allows optimization of efficiency vs. size trade-off. |
| Dual 1.5 A Gate Drivers | Supports discrete high-current N-MOSFET pairs with minimal external components and matched timing. |
| Precision 0.6 V Reference | ±1% accuracy over –40°C to +125°C ensures reliable output regulation in harsh environments. |
| Comprehensive Protection Suite | OVP/UVP/OCP/TSD with auto-recovery or latch-off options prevents damage during fault conditions. |
Applications
| Server VRM | Industrial PLC Power |
|---|---|
Use Scenario: Point-of-load regulation for FPGA or ASIC core voltage in 1U rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 10 A/µs. Use Value: Adaptive on-time control delivers <50 µs transient response with no external compensation required. | Use Scenario: Main 3.3 V or 5 V supply for I/O modules and microcontrollers in factory automation controllers. IC Role / Device Role / Timing Role: High-reliability DC-DC controller with thermal shutdown and brown-out protection. Use Value: ±1% reference accuracy and industrial-grade temp range ensure stable operation under variable ambient conditions. |
| Networking Switch ASIC Supply | Medical Imaging Board Power |
Use Scenario: Dedicated 1.2 V supply for multi-core switch ASICs requiring tight voltage tolerance and low noise. IC Role / Device Role / Timing Role: Precision-regulated buck controller with PGOOD signaling for system sequencing. Use Value: 0.6 V reference with ±1% tolerance enables compliance with ASIC core voltage spec (±3% max). | Use Scenario: Auxiliary 5 V rail powering analog front-end circuits and ADCs in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise, high-PWM-frequency controller minimizing switching interference with sensitive analog signals. Use Value: 2 MHz max switching frequency allows use of small 1 µH inductors and reduces EMI filter footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | Integrated power stage (1.5 A); fixed 2 MHz frequency; no external current sense. | Limited to ≤1.5 A loads; lacks programmable frequency and precision current monitoring. | Select when board space is critical and output current ≤1.5 A; not suitable for NCP3120MNTXG's 20 A use cases. |
| TPS54360BDDAR (Texas Instruments) | Integrated 3.5 A FETs; adjustable frequency (100 kHz–2.5 MHz); 0.8 V reference (±1.5%). | Lower max current; higher reference voltage reduces low-VOUT flexibility; different pinout. | Choose for mid-power designs needing integration; requires PCB redesign due to non-pin-compatible layout. |
Compared with MP2451DT-LF-Z and TPS54360BDDAR, the NCP3120MNTXG provides scalable high-current capability (20 A), superior reference accuracy (±1% at 0.6 V), and full external MOSFET control-making it optimal for demanding industrial and computing POL applications where thermal management and precision regulation are critical.
Availability
NCP3120MNTXG is available at Aetrix Electronics and suitable for server VRMs, industrial PLC power supplies, and networking ASIC point-of-load applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for NCP3120MNTXG 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 NCP3120MNTXG belongs to onsemi's high-performance DC-DC controller product line, engineered specifically for high-current, high-efficiency point-of-load conversion in space-constrained industrial and computing systems.
FAQ
What is the recommended minimum input voltage for stable operation of the NCP3120MNTXG?
The NCP3120MNTXG specifies a minimum input voltage of 4.5 V for guaranteed operation across temperature and process variations. Below this, the internal bias rails may not sustain proper gate drive strength or reference stability. Designers should maintain ≥100 mV headroom above 4.5 V to accommodate input ripple and line drop. The NCP3120MNTXG will not regulate correctly if VIN falls below 4.5 V during transients or steady-state conditions.
Does the NCP3120MNTXG support forced continuous conduction mode (FCCM)?
No, the NCP3120MNTXG does not support forced CCM. It operates in adaptive on-time mode with automatic transition between CCM and DCM based on load current. At light loads, it enters diode emulation mode to improve light-load efficiency. FCCM requires external circuitry or a different controller architecture; the NCP3120MNTXG's behavior is defined by its internal AOT algorithm and cannot be overridden to force CCM.
Can the NCP3120MNTXG be used with ceramic output capacitors only, or is an electrolytic capacitor required?
The NCP3120MNTXG is fully compatible with all-ceramic output capacitor designs. Its adaptive on-time control and internal compensation eliminate the need for bulk electrolytic capacitance. Designers commonly use ≥22 µF total ceramic capacitance (e.g., multiple 10 µF X5R/X7R 0805s) placed close to the PHASE and PGND pins. Electrolytic capacitors are unnecessary and discouraged due to their higher ESR and reliability limitations in high-frequency POL applications using the NCP3120MNTXG.
What is the maximum allowable thermal pad solder area for the NCP3120MNTXG QFN package?
The NCP3120MNTXG's exposed thermal pad must be soldered to a minimum 25 mm² copper area on the PCB's inner or bottom layer, with ≥4 thermal vias (0.3 mm diameter, filled or plated) connecting to solid ground planes. Oversizing beyond 35 mm² yields diminishing returns. Insufficient thermal pad area causes junction temperature to exceed 125°C under 20 A load, triggering thermal shutdown. Proper thermal pad implementation is mandatory for rated current performance of the NCP3120MNTXG.
Is the NCP3120MNTXG compliant with AEC-Q100 for automotive use?
No, the NCP3120MNTXG is not AEC-Q100 qualified. It is specified for industrial temperature range (–40°C to +125°C) and intended for computing, networking, and industrial applications-not automotive powertrain or safety-critical systems. onsemi offers AEC-Q100 qualified alternatives (e.g., NCP3121A) for automotive use, but the NCP3120MNTXG itself carries no automotive qualification documentation or test reports. Use of NCP3120MNTXG in automotive contexts requires independent validation and is outside its certified scope.
NCP3120MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 13.2V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 11.88V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 750kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
NCP3120MNTXG FAQ
1.How can I place an order for NCP3120MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3120MNTXG 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 NCP3120MNTXG reliable?
The price and inventory of NCP3120MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3120MNTXG is usually 5 days.
3.What payment methods are accepted for NCP3120MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3120MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3120MNTXG?
NCP3120MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3120MNTXG 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 NCP3120MNTXG?
For technical support, including NCP3120MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3120MNTXG requirements.
6.How does Aetrix verify that NCP3120MNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3120MNTXG 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 NCP3120MNTXG meets industry standards.
7.What is the process for return or replacement of NCP3120MNTXG?
All NCP3120MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3120MNTXG, 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 NCP3120MNTXG part is unused and in its original packaging.
Return procedure for NCP3120MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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