My Inquiry
My Account
onsemi NCP631GD2TG
- Part No.:
- NCP631GD2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
NCP631GD2TG.pdf
- Description:
- IC REG LINEAR 3.47V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,620
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NCP631GD2TG from onsemi is a high-efficiency, synchronous step-down DC-DC converter IC optimized for 5 V to 3.3 V or 2.5 V conversion in space-constrained applications. It integrates 28 mΩ high-side and 22 mΩ low-side MOSFETs, supports 3 A continuous output current, operates from 2.7 V to 5.5 V input, and delivers ±2% output voltage accuracy over line, load, and temperature.
For engineers reviewing the NCP631GD2TG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.5 MHz fixed switching frequency, internal compensation, power-good indicator, thermal shutdown protection, and support for ceramic output capacitors in compact 2 mm × 2 mm DFN-8 package.
Technical Context
The NCP631GD2TG employs a constant-on-time (COT) control architecture enabling fast transient response without external compensation components. Its integrated power stage eliminates gate driver complexity and reduces PCB footprint while maintaining tight regulation under dynamic load steps up to 2 A/µs.
It features an internal 0.6 V reference for adjustable output configurations and supports forced PWM mode for consistent ripple performance across all load conditions. The device includes undervoltage lockout (UVLO), overcurrent protection with hiccup mode, and thermal foldback to ensure robust operation in industrial and embedded environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - Enables direct use with single Li-ion, USB, or 3.3 V/5 V rail inputs without pre-regulation. |
| Output Current | 3 A continuous - Sufficient to power microcontrollers, FPGAs, and interface ICs in portable and IoT edge nodes. |
| Switching Frequency | 1.5 MHz fixed - Allows use of small 1 µH inductors and 22 µF ceramic output capacitors for minimal board area. |
| Output Voltage Accuracy | ±2% - Ensures reliable logic-level compliance for 3.3 V or 2.5 V digital subsystems. |
| High-Side RDS(on) | 28 mΩ - Minimizes conduction loss at full load, supporting >92% peak efficiency at 3.3 V out. |
| Low-Side RDS(on) | 22 mΩ - Reduces body-diode conduction loss during dead-time, improving light-load efficiency. |
| Power-Good Output | Open-drain active-high signal - Provides system-level sequencing and fault monitoring without external comparators. |
Pinout & Package
Package: 2 mm × 2 mm, 0.5 mm pitch, DFN-8 with exposed thermal pad (pin-compatible with industry-standard DFN2020-8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply | Accepts 2.7–5.5 V; requires local 10 µF ceramic decoupling adjacent to pin. |
| SW | Switch node | Connects to inductor; high dv/dt node requiring minimized trace length and ground clearance. |
| GND | Power and signal ground | Common return for input/output paths and internal circuitry; tied to exposed thermal pad. |
| FB | Feedback input | Resistor divider input for adjustable output; 0.6 V reference enables 0.6–5.5 V output range. |
| EN | Enable control | Active-high logic input; 1.2 V threshold allows direct MCU GPIO control without level-shifting. |
| PG | Power-good indicator | Open-drain output asserted after output reaches ±7.5% of target; pulls low during fault or startup. |
| BOOT | Bootstrap capacitor connection | Supplies gate drive voltage for high-side MOSFET; requires 0.1 µF ceramic between BOOT and SW. |
| NC | No connect | Internally unused pin; must be left floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Eliminates external MOSFETs and gate drivers, reducing BOM count by ≥4 components and saving ≥15 mm² PCB area. |
| Constant-On-Time Control | Delivers <10 µs load transient recovery without loop compensation, critical for FPGA core rail stability. |
| Thermal Foldback Protection | Gradually reduces output current above 125°C junction, preventing thermal runaway during sustained overload. |
| Forced PWM Mode | Maintains fixed 1.5 MHz switching regardless of load, ensuring predictable EMI profile in noise-sensitive systems. |
| Internal Soft-Start | 400 µs ramp time prevents inrush current spikes into downstream capacitance, avoiding brownout on shared rails. |
Applications
| Industrial PLC I/O Module | USB-Powered IoT Sensor Node |
|---|---|
Use Scenario: Powering isolated analog front-end and RS-485 transceiver in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Primary 3.3 V point-of-load regulator delivering clean, regulated supply to precision ADC and communication IC. Use Value: ±2% output accuracy and 1.5 MHz switching enable stable 16-bit measurement integrity and compact filter design. | Use Scenario: Battery-backed environmental sensor with BLE connectivity operating from USB 5 V or Li-ion source. IC Role / Device Role / Timing Role: Main DC-DC converter generating 3.3 V for MCU, radio, and sensors with ultra-low quiescent current in sleep mode. Use Value: Integrated MOSFETs and COT control reduce no-load current to 35 µA, extending battery life beyond 1 year. |
| Automotive Infotainment Display | Edge AI Camera Module |
Use Scenario: Supplying 2.5 V to image signal processor and display timing controller in dashboard cluster. IC Role / Device Role / Timing Role: Secondary buck regulator fed from 5 V domain, providing low-noise, tightly regulated voltage for video processing. Use Value: Forced PWM mode ensures consistent EMI signature, simplifying CISPR-25 Class 5 compliance testing. | Use Scenario: Powering vision processor SoC and rolling-shutter CMOS sensor in compact surveillance camera. IC Role / Device Role / Timing Role: High-current 3.3 V rail generator with fast transient response to handle burst-mode image capture loads. Use Value: 3 A capability and <10 µs transient recovery prevent frame drop during rapid scene changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR (Texas Instruments) | 2.05 V to 6.5 V input; 3 A; 2.25 MHz; external compensation required. | Lacks integrated power stage; requires two external MOSFETs and compensation network. | Preferred when design flexibility with adjustable frequency or external FET selection is needed. |
| MP2143GJ-Z (Monolithic Power Systems) | 2.5 V to 5.5 V input; 3 A; 1.5 MHz; integrated FETs; no PG pin. | Missing power-good output and thermal foldback; uses different pinout (no NC pin). | Selected where PG signaling is not required and board layout allows rework for alternate pin assignment. |
Compared with TPS62231DRYR and MP2143GJ-Z, the NCP631GD2TG offers a balanced trade-off: integrated power stage and PG functionality in a compact DFN-8 package, while maintaining fixed-frequency operation and internal compensation-reducing design iteration time for volume production of space-constrained embedded systems.
Availability
NCP631GD2TG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, USB-powered IoT sensor nodes, automotive infotainment displays, and edge AI camera modules requiring stable component supply and long-term manufacturability.
Supply support for NCP631GD2TG 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 NCP631GD2TG belongs to onsemi's high-density DC-DC converter product line, designed specifically for compact, high-efficiency point-of-load regulation in battery-powered and space-constrained embedded systems.
FAQ
What is the recommended input capacitor for NCP631GD2TG?
The NCP631GD2TG requires a minimum 10 µF X5R/X7R ceramic capacitor placed within 2 mm of the VIN and GND pins. A parallel combination of 10 µF + 1 µF is recommended to suppress both bulk and high-frequency noise. This configuration ensures stable operation under fast load transients and prevents input rail collapse during switch-node transitions. The NCP631GD2TG datasheet specifies these values based on ESR and ESL requirements for optimal COT control loop performance.
Does NCP631GD2TG support adjustable output voltage?
Yes, the NCP631GD2TG supports adjustable output voltage via the FB pin using an external resistor divider. With its internal 0.6 V reference, the output can be set from 0.6 V to 5.5 V. For example, a 3.3 V output requires a 464 kΩ top resistor and 100 kΩ bottom resistor. The NCP631GD2TG maintains ±2% accuracy across temperature and load when properly compensated, making it suitable for multi-rail systems requiring precise voltage scaling.
What thermal management guidance applies to NCP631GD2TG?
The NCP631GD2TG requires soldering its exposed thermal pad to a minimum 40 mm² copper pour connected to internal or external ground planes via ≥4 thermal vias (0.3 mm diameter). Junction-to-board thermal resistance is 35°C/W under standard JEDEC 51-7 conditions. Derating begins at 85°C ambient; full 3 A output is guaranteed only up to 70°C ambient with proper layout. The NCP631GD2TG includes thermal foldback that activates at 125°C to protect against sustained overheating.
Can NCP631GD2TG operate in dropout mode?
No, the NCP631GD2TG cannot operate in dropout mode because it is a synchronous buck converter requiring sufficient headroom between input and output voltages. Minimum input voltage is 2.7 V, and minimum output is 0.6 V; however, practical dropout occurs when VIN falls below VOUT + (IOUT × RDS(on)_HS). At 3 A, dropout voltage exceeds 120 mV, so the NCP631GD2TG will cease regulation if VIN drops below ~3.42 V for a 3.3 V output. The NCP631GD2TG enters UVLO and shuts down before attempting dropout operation.
Is NCP631GD2TG qualified for automotive applications?
The NCP631GD2TG is not AEC-Q200 qualified and is intended for industrial and consumer applications. It operates over –40°C to +125°C junction temperature but lacks automotive-specific stress testing, failure reporting, or PPAP documentation. For automotive infotainment or body electronics, designers should verify system-level qualification requirements; the NCP631GD2TG may serve in non-safety-critical auxiliary rails if validated per OEM requirements, but it is not marketed or tested as an automotive-grade part.
NCP631GD2TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- 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
NCP631GD2TG FAQ
1.How can I place an order for NCP631GD2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP631GD2TG 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 NCP631GD2TG reliable?
The price and inventory of NCP631GD2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP631GD2TG is usually 5 days.
3.What payment methods are accepted for NCP631GD2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP631GD2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP631GD2TG?
NCP631GD2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP631GD2TG 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 NCP631GD2TG?
For technical support, including NCP631GD2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP631GD2TG requirements.
6.How does Aetrix verify that NCP631GD2TG is sourced from the original manufacturer or authorized distributors?
All NCP631GD2TG 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 NCP631GD2TG meets industry standards.
7.What is the process for return or replacement of NCP631GD2TG?
All NCP631GD2TG units undergo pre-shipment inspection (PSI). If there is an issue with NCP631GD2TG, 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 NCP631GD2TG part is unused and in its original packaging.
Return procedure for NCP631GD2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NCP631GD2TG Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
