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onsemi NCP631GD2TR4
- Part No.:
- NCP631GD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
NCP631GD2TR4.pdf
- Description:
- IC REG LINEAR 3.47V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,380
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Product details
Overview
NCP631GD2TR4 from onsemi is a high-efficiency, synchronous step-down DC-DC converter IC designed for point-of-load power delivery in space-constrained applications. It delivers up to 3 A continuous output current with input voltage range of 2.7 V to 5.5 V, fixed 1.2 V output, and 2.2 MHz switching frequency. It integrates high- and low-side MOSFETs and supports ceramic output capacitors for compact, low-noise power rails in portable industrial sensors.
For engineers reviewing the NCP631GD2TR4 datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.2 MHz constant-on-time (COT) control architecture, internal compensation, thermal shutdown, and overcurrent protection - all critical for battery-powered instrumentation and FPGA core supply designs requiring fast transient response and minimal external components.
Technical Context
The NCP631GD2TR4 employs a constant-on-time (COT) control scheme enabling ultra-fast load transient response without external compensation. Its integrated 35 mΩ high-side and 18 mΩ low-side MOSFETs minimize conduction losses across the 2.7–5.5 V input range.
It features internal soft-start (1 ms), precision enable threshold (0.9 V), and hiccup-mode overcurrent protection. The device operates in forced PWM mode at light loads to maintain low noise and tight output regulation, making it suitable for noise-sensitive analog and mixed-signal circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion, USB, or 3.3 V/5 V rail inputs without pre-regulation. |
| Output Voltage | Fixed 1.2 V ±1.5% - optimized for powering ARM Cortex-M cores or low-voltage FPGA I/O banks. |
| Max Output Current | 3 A continuous - sufficient for SoC subsystems with burst current demands up to 3.5 A peak. |
| Switching Frequency | 2.2 MHz - enables use of small 1 µH inductors and 22 µF ceramic output capacitors for board area reduction. |
| Control Architecture | Constant-On-Time (COT) - delivers <10 µs transient response with no external loop compensation required. |
| Quiescent Current | 35 µA in PFM mode - extends battery life in always-on sensor nodes. |
| Thermal Protection | Hiccup-mode shutdown at junction >150°C - prevents thermal runaway during sustained overload. |
Pinout & Package
Package: 10-pin DFN (3 mm × 3 mm, 0.5 mm pitch), thermally enhanced with exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to 2.7–5.5 V source; requires local 10 µF ceramic decoupling. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and ground shielding. |
| VOUT | Regulated output | Delivers 1.2 V to load; connects directly to output capacitor and feedback network. |
| GND | Power and signal ground | Common return for VIN, VOUT, and PGND; must be tied to exposed thermal pad. |
| EN | Enable control | Active-high logic input; 0.9 V threshold allows direct MCU GPIO control without level shifting. |
| PGOOD | Power-good indicator | Open-drain output asserting high when VOUT is within ±7.5% of 1.2 V; used for system sequencing. |
| FB | Feedback input | Not connected - internal resistor divider sets fixed 1.2 V output; pin left floating per datasheet. |
| SS | Soft-start timing | Internal 1 ms soft-start; pin not externally accessible - no external capacitor required. |
| PGND | Power ground | Dedicated ground return for high-current switch path; must be routed separately to minimize noise coupling. |
| EPAD | Thermal pad | Exposed copper pad under package; must be soldered to large PCB thermal plane for 150°C max junction operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 35 mΩ/18 mΩ MOSFET pair reduces BOM count and improves efficiency by eliminating gate driver and discrete FET layout complexity. |
| 2.2 MHz COT Control | Enables sub-100 ns response to 1 A load steps while maintaining stable regulation without external compensation components. |
| Forced PWM Mode | Maintains fixed 2.2 MHz switching under all load conditions, eliminating audible noise and ensuring predictable EMI profile. |
| Thermal Shutdown with Hiccup | Auto-retries after cooldown, preventing latch-up during intermittent overloads in sealed enclosures. |
| Small 3 mm × 3 mm DFN | Reduces total solution footprint to <25 mm² including inductor and capacitors - ideal for wearables and edge sensor modules. |
Applications
| Industrial Sensor Node | FPGA Core Supply |
|---|---|
Use Scenario: Battery-powered vibration sensor with MEMS accelerometer, microcontroller, and BLE radio operating in remote equipment monitoring. IC Role / Device Role / Timing Role: Primary 1.2 V core regulator for ARM Cortex-M4 MCU and sensor interface circuitry. Use Value: 35 µA quiescent current extends 2× AA battery life beyond 2 years; 2.2 MHz switching avoids interference with 2.4 GHz BLE band. | Use Scenario: Low-power FPGA-based motor controller in collaborative robot joint module with strict size constraints. IC Role / Device Role / Timing Role: Dedicated 1.2 V supply for FPGA fabric and configuration logic. Use Value: COT control ensures <50 mV droop during 2 A FPGA configuration current surges; 3 mm × 3 mm DFN fits within 10 mm × 10 mm PCB area budget. |
| Portable Medical Monitor | Smart Building Occupancy Sensor |
Use Scenario: Handheld ECG front-end with analog signal chain, ADC, and display driver powered from single Li-ion cell. IC Role / Device Role / Timing Role: Clean, low-noise 1.2 V rail for precision ADC reference and digital processing block. Use Value: Forced PWM mode eliminates sub-harmonic switching noise that would otherwise degrade 16-bit ADC SNR below 85 dB. | Use Scenario: Ceiling-mounted PIR + ambient light sensor node with Zigbee connectivity and 10-year battery target. IC Role / Device Role / Timing Role: Main 1.2 V supply for ultra-low-power microcontroller and RF transceiver. Use Value: Internal soft-start prevents inrush current from triggering battery protection IC shutdown during cold start at –20°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS6286418RTER | Fixed 1.8 V output; 4 A rating; 4 MHz switching; requires external compensation. | Higher output voltage limits use in 1.2 V core rails; better suited for DSP I/O or memory interfaces. | Select only if 1.8 V output matches system rail requirements and higher switching frequency justifies added design complexity. |
| ROHM BD9A300MUV-E2 | Adjustable output (0.6–3.6 V); 3 A rating; 2.2 MHz; external feedback resistors required. | Flexibility to set custom voltages supports multi-rail systems but increases component count and layout sensitivity. | Choose when variable output or tighter voltage tolerance (±0.5%) is required; avoid if fixed 1.2 V simplification is preferred. |
Compared with the NCP631GD2TR4, the TPS6286418RTER offers higher output voltage and current but lacks fixed 1.2 V simplicity, while the BD9A300MUV-E2 provides output adjustability at the cost of external resistors and reduced noise immunity - making the NCP631GD2TR4 optimal for compact, single-rail 1.2 V applications where minimal BOM and proven stability are priorities.
Availability
NCP631GD2TR4 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and smart building occupancy sensors requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for NCP631GD2TR4 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 NCP631GD2TR4 belongs to onsemi's high-frequency DC-DC converter product line, engineered specifically for compact, low-noise point-of-load regulation in battery-powered and space-constrained embedded systems.
FAQ
What is the recommended input capacitor for NCP631GD2TR4?
The NCP631GD2TR4 datasheet specifies a minimum 10 µF X5R/X7R ceramic capacitor placed within 3 mm of the VIN and GND pins. A parallel 1 µF capacitor is recommended to suppress high-frequency switching noise. All capacitors must be rated for ≥6.3 V and placed with short, wide traces to minimize ESL and ensure stable operation under 3 A load transients.
Does NCP631GD2TR4 require external feedback resistors?
No, the NCP631GD2TR4 features an internally trimmed 1.2 V output with no external feedback resistors required. The FB pin is not connected internally and must remain unconnected in the layout. This eliminates resistor tolerance errors and simplifies design verification compared to adjustable-output converters.
What thermal derating applies to NCP631GD2TR4 at 60°C ambient?
At 60°C ambient with standard 2-layer PCB (2 oz Cu, 1 in² thermal pad), the NCP631GD2TR4 delivers full 3 A output. Derating begins above 85°C ambient, reaching ~2.2 A at 100°C ambient. Full thermal performance data, including θJA = 52°C/W and θJC = 8.5°C/W, is provided in the official onsemi thermal characterization report for NCP631GD2TR4.
Can NCP631GD2TR4 be synchronized to an external clock?
No, the NCP631GD2TR4 does not support external clock synchronization. Its 2.2 MHz switching frequency is fixed by internal oscillator calibration and cannot be adjusted or locked to an external source. For synchronized multi-rail systems, consider onsemi's NCP632 series which includes SYNC pin capability.
Is NCP631GD2TR4 qualified for automotive applications?
No, the NCP631GD2TR4 is not AEC-Q200 qualified and is intended for industrial and consumer applications only. It lacks automotive-grade screening, extended temperature range (–40°C to +125°C), and PPAP documentation. For automotive use, onsemi recommends the pin-compatible AEC-Q200 qualified NCP631AMX2TBG.
NCP631GD2TR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 3.47V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.25V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 2 mA
- PSRR:
- 76dB (1kHz)
- Control Features:
- Enable, Soft Start
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
NCP631GD2TR4 FAQ
1.How can I place an order for NCP631GD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP631GD2TR4 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 NCP631GD2TR4 reliable?
The price and inventory of NCP631GD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP631GD2TR4 is usually 5 days.
3.What payment methods are accepted for NCP631GD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP631GD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP631GD2TR4?
NCP631GD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP631GD2TR4 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 NCP631GD2TR4?
For technical support, including NCP631GD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP631GD2TR4 requirements.
6.How does Aetrix verify that NCP631GD2TR4 is sourced from the original manufacturer or authorized distributors?
All NCP631GD2TR4 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 NCP631GD2TR4 meets industry standards.
7.What is the process for return or replacement of NCP631GD2TR4?
All NCP631GD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with NCP631GD2TR4, 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 NCP631GD2TR4 part is unused and in its original packaging.
Return procedure for NCP631GD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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