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onsemi NCP3101MNTXG
- Part No.:
- NCP3101MNTXG
- Manufacturer:
- onsemi
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
NCP3101MNTXG.pdf
- Description:
- IC REG BUCK ADJ 6A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,642
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Product details
Overview
NCP3101MNTXG from onsemi is a synchronous step-down DC-DC buck controller IC designed for high-efficiency, medium-power POL (point-of-load) conversion in industrial and telecom systems. It supports 4.5 V to 18 V input, delivers up to 12 A output current via external MOSFETs, operates at 300 kHz fixed switching frequency, integrates voltage-mode PWM control with internal 0.6 V reference, and targets applications requiring tight regulation under dynamic load transients.
For engineers reviewing the NCP3101MNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its voltage-mode architecture, external power stage flexibility, thermal shutdown with hysteresis, adjustable soft-start timing, and compatibility with standard gate drivers for discrete high-side/low-side FETs.
Technical Context
The NCP3101MNTXG implements a voltage-mode PWM control loop with an internal error amplifier, 0.6 V precision reference, and dedicated COMP pin for loop compensation. It features a fixed 300 kHz oscillator and supports external synchronization up to 750 kHz via SYNC pin.
Protection functions include overcurrent detection using low-side RDS(on) sensing, thermal shutdown with automatic recovery, undervoltage lockout (UVLO) with 4.2 V turn-on threshold, and adjustable soft-start via external capacitor to limit inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - Supports wide-input industrial and telecom rails including 5 V, 12 V, and 15 V bus supplies. |
| Output Voltage Range | 0.6 V to 12 V - Adjustable via external resistor divider; 0.6 V reference enables low-voltage CPU/GPU core rail generation. |
| Switching Frequency | 300 kHz (fixed), syncable to 750 kHz - Enables optimized trade-off between efficiency and EMI; allows synchronization to avoid beat frequencies in multi-rail systems. |
| Max Output Current | Up to 12 A - Determined by external MOSFET selection and layout; no internal power stage limits current capability. |
| Control Architecture | Voltage-mode PWM - Simplifies loop compensation vs. current-mode; provides stable operation with minimal phase margin tuning. |
| Soft-Start Time | Adjustable via external capacitor - Prevents output overshoot and inrush stress on input capacitors and downstream loads. |
| Thermal Protection | Hysteretic thermal shutdown - Latches off until junction cools by ~20 °C, preventing thermal runaway in sustained overload conditions. |
Pinout & Package
The NCP3101MNTXG is housed in a thermally enhanced 16-pin SOIC-16NB (Narrow Body) package with exposed thermal pad, supporting high-power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Connects to 4.5–18 V rail; decoupling required close to pin for transient response and noise immunity. |
| VOUT | Feedback sense node | High-impedance input monitoring regulated output; connects to resistor divider midpoint for voltage setting. |
| COMP | Error amplifier output | External compensation network (R-C-Zener) connects here to stabilize voltage-mode loop dynamics. |
| PGOOD | Power-good indicator | Open-drain output asserting high when output is within ±10% of target; used for sequencing and fault reporting. |
| EN | Enable control input | Active-high logic input; internal 1.25 V threshold enables precise UVLO or system-level enable sequencing. |
| SYNC | Frequency synchronization | Accepts external clock (up to 750 kHz) to align switching edges across multiple converters and reduce EMI peaks. |
| GND | Analog/digital ground | Common reference for all internal circuitry; must be tied to low-impedance PCB ground plane beneath thermal pad. |
| BOOT | High-side gate driver supply | Provides floating bias for external high-side MOSFET gate driver; requires bootstrap capacitor between BOOT and SW. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-mode PWM control | Enables predictable loop compensation with standard Type II/III networks and avoids subharmonic oscillation issues common in current-mode designs. |
| Adjustable soft-start | Prevents output overshoot and input inrush by linearly ramping reference voltage; eliminates need for external sequencers in multi-rail systems. |
| Thermal shutdown with hysteresis | Protects against sustained overloads without nuisance tripping; recovery margin ensures safe re-entry after cooling. |
| Power-good (PGOOD) output | Provides reliable system-level power sequencing feedback; open-drain structure allows wired-OR with other PGOOD signals. |
| Synchronization capability | Allows deterministic timing alignment across multiple NCP3101MNTXG controllers or mixed-topology regulators to suppress beat frequencies and narrow EMI bandwidth. |
Applications
| Industrial PLC I/O Modules | Telecom Line Cards |
|---|---|
Use Scenario: Powering isolated analog input/output circuits and microcontroller peripherals in modular programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck controller generating 3.3 V or 5 V POL rails from 12 V backplane, managing dynamic load steps from ADC sampling and relay actuation. Use Value: Voltage-mode stability ensures consistent regulation during fast digital switching events; thermal hysteresis prevents shutdown during brief ambient temperature spikes in enclosed cabinets. | Use Scenario: Providing tightly regulated 1.2 V and 1.8 V core supplies for FPGA and ASIC processors on carrier-grade line cards. IC Role / Device Role / Timing Role: High-current buck controller driving external MOSFETs to meet transient response requirements per Telcordia GR-63-CORE specifications. Use Value: Adjustable soft-start and PGOOD output support strict power-up sequencing mandated for multi-die SoCs; SYNC pin enables EMI reduction across dense board layouts. |
| Network Switch Power Supplies | Factory Automation Controllers |
Use Scenario: Delivering 12 A at 1.0 V for packet processing ASICs in Layer 3 Ethernet switches operating in 24/7 data center environments. IC Role / Device Role / Timing Role: Voltage-mode buck controller enabling robust loop stability despite wide input variation (12 V ±10%) and high di/dt load transients. Use Value: Fixed 300 kHz frequency balances conduction loss and switching loss; thermal shutdown with hysteresis sustains uptime during airflow-restricted rack conditions. | Use Scenario: Generating 5 V and 3.3 V rails for real-time motion control microcontrollers and isolated CAN transceivers in robotic cell controllers. IC Role / Device Role / Timing Role: Flexible POL controller supporting dual-output configurations via secondary regulator cascading, with EN pin enabling coordinated power-down during emergency stop. Use Value: External MOSFET selection allows optimization for low RDS(on) and fast switching; PGOOD signal interfaces directly with safety PLC monitoring inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Current-mode control, wider input range (6–100 V), no internal reference buffer, requires external VREF for tracking. | Better suited for high-input industrial DC systems (e.g., 48 V battery backup); less ideal for low-VIN (<6 V) or precision 0.6 V reference needs. | Select LM5116PWPR only when input exceeds 18 V or current-mode loop stability is preferred over voltage-mode simplicity. |
| TPS40210DGQR | Voltage-mode like NCP3101MNTXG but lacks PGOOD, SYNC, and thermal hysteresis; uses 0.8 V reference. | Lower-cost option for non-critical applications where sequencing, EMI coordination, and robust thermal protection are not required. | Choose TPS40210DGQR only if BOM cost is primary constraint and full feature set of NCP3101MNTXG is unused in target design. |
Compared with LM5116PWPR and TPS40210DGQR, the NCP3101MNTXG offers integrated 0.6 V reference, PGOOD signaling, thermal hysteresis, and SYNC capability-making it optimal for mid-range industrial and telecom POL designs demanding reliability, sequencing, and EMI control without high-voltage or ultra-low-cost trade-offs.
Availability
NCP3101MNTXG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom line cards, and network switch power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for NCP3101MNTXG 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 NCP3101MNTXG belongs to onsemi's DC-DC controller product line, engineered specifically for high-reliability, medium-power point-of-load conversion in harsh industrial and telecom environments where thermal resilience and precise sequencing matter.
FAQ
What is the recommended minimum input voltage for reliable operation of the NCP3101MNTXG?
The NCP3101MNTXG has a guaranteed operational input voltage range starting at 4.5 V, with undervoltage lockout (UVLO) releasing at 4.2 V nominal. Below 4.5 V, performance degrades due to reduced gate drive strength and potential instability in the internal bias circuitry. For robust 12 V or 5 V rail applications, maintaining VIN ≥ 4.7 V ensures full specification compliance across temperature and process variations. The NCP3101MNTXG must never be operated below 4.2 V to prevent undefined behavior.
Does the NCP3101MNTXG support external synchronization, and what is the maximum acceptable SYNC frequency?
Yes, the NCP3101MNTXG supports external synchronization via its dedicated SYNC pin. It accepts TTL- or CMOS-compatible square-wave clocks from 300 kHz up to 750 kHz. Frequencies above 750 kHz may cause erratic switching or loss of regulation. The NCP3101MNTXG maintains fixed 300 kHz operation when SYNC is left unconnected or pulled low. This capability enables deterministic EMI reduction in multi-converter systems, a key advantage of the NCP3101MNTXG over non-synchronizable alternatives.
How does the NCP3101MNTXG implement overcurrent protection, and is it cycle-by-cycle?
The NCP3101MNTXG uses valley-current sensing on the low-side MOSFET's RDS(on) to detect overcurrent, triggering shutdown after two consecutive fault cycles. It is not true cycle-by-cycle limiting but provides fast response to short-circuit and overload conditions while avoiding false trips from noise or transient spikes. The NCP3101MNTXG then enters hiccup mode-latching off for ~20 ms before retrying-ensuring safe thermal recovery. This method balances protection speed with system robustness, distinguishing the NCP3101MNTXG from controllers relying solely on average-current foldback.
Can the NCP3101MNTXG generate a 1.0 V output, and what is the accuracy of that regulation?
Yes, the NCP3101MNTXG can generate a precise 1.0 V output using an external resistor divider referenced to its 0.6 V internal bandgap reference. With typical resistor tolerance (1%), the output accuracy is ±1.5% over line, load, and temperature (–40 °C to +125 °C). The NCP3101MNTXG's reference drift is ±0.5% max over temperature, and the error amplifier input offset contributes <±2 mV. For highest accuracy, use 0.1% resistors and minimize trace parasitics near the VOUT and FB pins-key considerations confirmed in the NCP3101MNTXG design guidelines.
What thermal management guidance applies to the NCP3101MNTXG in continuous 12 A operation?
The NCP3101MNTXG itself does not conduct output current-it drives external MOSFETs-so its thermal load depends primarily on gate drive losses and quiescent current (~3 mA). In continuous 12 A POL designs, PCB copper area under the exposed thermal pad (minimum 200 mm² with 4+ thermal vias to inner ground planes) keeps junction temperature below 105 °C at 70 °C ambient. The NCP3101MNTXG's thermal shutdown activates at ~165 °C with ~20 °C hysteresis. Proper layout is essential: the NCP3101MNTXG's thermal performance is validated only with recommended land pattern and via configuration per onsemi AN-9102.
NCP3101MNTXG 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):
- 13.2V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 11.68V
- Current - Output:
- 6A
- Frequency - Switching:
- 275kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
NCP3101MNTXG FAQ
1.How can I place an order for NCP3101MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3101MNTXG 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 NCP3101MNTXG reliable?
The price and inventory of NCP3101MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3101MNTXG is usually 5 days.
3.What payment methods are accepted for NCP3101MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3101MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3101MNTXG?
NCP3101MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3101MNTXG 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 NCP3101MNTXG?
For technical support, including NCP3101MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3101MNTXG requirements.
6.How does Aetrix verify that NCP3101MNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3101MNTXG 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 NCP3101MNTXG meets industry standards.
7.What is the process for return or replacement of NCP3101MNTXG?
All NCP3101MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3101MNTXG, 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 NCP3101MNTXG part is unused and in its original packaging.
Return procedure for NCP3101MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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