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onsemi NCP3127ADR2G
- Part No.:
- NCP3127ADR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCP3127ADR2G.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,363
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Product details
Overview
NCP3127ADR2G from onsemi is a 3A synchronous step-down DC-DC converter with integrated high- and low-side MOSFETs, operating from 4.5V to 18V input, delivering adjustable output down to 0.6V with ±1% reference accuracy and 300kHz fixed switching frequency.
For engineers reviewing the NCP3127ADR2G datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range compatibility, integrated FET RDS(on) (25mΩ/12mΩ), thermal performance in SOIC-8EP, light-load efficiency mode, and enable/shutdown control timing.
Technical Context
The NCP3127ADR2G implements a current-mode PWM control architecture with internal compensation, supporting external soft-start via capacitor and power-good indication with 1% threshold accuracy. It integrates bootstrap diode and gate drivers optimized for 3A continuous load capability.
Thermal shutdown, overcurrent protection with hiccup mode, and undervoltage lockout (UVLO) with 4.2V turn-on/3.9V turn-off hysteresis are embedded. The device supports forced PWM or auto PFM operation depending on load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 5 V, 12 V, and 15 V rail inputs without external pre-regulation |
| Output Voltage Range | 0.6 V to VIN × 0.9 - enables core logic supply generation with external resistor divider |
| Max Output Current | 3 A continuous - sufficient for FPGA I/O banks, microcontroller cores, and ASIC auxiliary rails |
| Switching Frequency | 300 kHz fixed - balances EMI, inductor size, and efficiency for industrial power supplies |
| Reference Accuracy | ±1% at 25°C - ensures tight output regulation under line/load transients |
| Enable Threshold | 1.25 V typical - compatible with standard GPIO and sequenced power-up control |
| Thermal Shutdown | 150°C activation - protects against sustained overload or poor PCB heatsinking |
Pinout & Package
Package: SOIC-8EP (Exposed Pad), 5.0 mm × 6.0 mm × 1.75 mm body, thermal pad soldered to PCB ground plane for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Connects to bulk input capacitor; must be decoupled within 5 mm of pin |
| SW | Switch Node | Drives external inductor; requires low-inductance layout to minimize ringing |
| PGND | Power Ground | High-current return path for low-side FET and input/output capacitors |
| AGND | Analog Ground | Reference ground for feedback and control circuitry; tied to PGND at single point |
| FB | Feedback Input | Resistor-divider connection point for output voltage sensing and regulation |
| EN | Enable Control | Active-high logic input; pulls low to disable converter and reduce quiescent current |
| PG | Power-Good Output | Open-drain signal asserting when output is within ±10% of target voltage |
| SS | Soft-Start Timing | Capacitor-connected pin controlling ramp rate of output voltage during startup |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | Eliminates external FET selection and layout complexity; RDS(on) values optimized for 3A conduction loss |
| Internal Bootstrap Diode | Removes need for external bootstrap diode, reducing BOM count and board area in SOIC-8EP footprint |
| Power-Good Indicator | Enables system-level sequencing and fault reporting without external supervisor IC |
| Hiccup-Mode Overcurrent Protection | Limits average power during short-circuit events while allowing automatic recovery after cooling |
| Adjustable Soft-Start | Prevents inrush current and output overshoot via external capacitor; configurable startup time |
Applications
| Industrial PLC I/O Module | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Powering isolated digital I/O channels and analog front-end ADCs in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V or 1.8 V point-of-load regulator with fast transient response to handle burst-mode sensor sampling. Use Value: Integrated FETs and 300 kHz switching enable compact, thermally robust design meeting EN 61000-6-4 emission limits. | Use Scenario: Generating processor core voltage (e.g., 1.1 V) for ARM-based infotainment SoCs in head units. IC Role / Device Role / Timing Role: Synchronous buck regulator with precise ±1% reference supporting dynamic voltage scaling (DVS). Use Value: Low RDS(on) and internal compensation reduce component count while maintaining stability across temperature. |
| Network Switch PHY Supply | Medical Imaging Sensor Bias |
Use Scenario: Delivering clean 2.5 V supply to Gigabit Ethernet PHY ICs with strict ripple requirements. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5 V or 12 V backplane, operating in forced PWM mode for consistent noise profile. Use Value: Fixed 300 kHz frequency simplifies EMI filter design; PG signal enables PHY initialization handshake. | Use Scenario: Providing stable 3.3 V bias to CMOS image sensor arrays in portable ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with thermal shutdown protecting sensitive analog front-end circuits. Use Value: SOIC-8EP package allows direct thermal coupling to metal housing, maintaining sensor SNR across ambient shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z (Monolithic Power) | 4.5–24 V input, 3A, 500 kHz switching, no PG output, different pinout | Lacks power-good signaling; requires external soft-start capacitor | Preferred where higher frequency reduces inductor size but PG sequencing is not required |
| TPS54331DR (Texas Instruments) | 3.5–28 V input, 3A, adjustable frequency (100–2500 kHz), external FETs required | Requires external high/low-side MOSFETs and compensation network | Chosen when design flexibility and wide frequency tuning outweigh BOM simplicity |
Compared with MP2315DJ-LF-Z and TPS54331DR, the NCP3127ADR2G offers integrated FETs, built-in PG, and fixed 300 kHz operation-reducing design cycle time for cost-sensitive industrial and automotive auxiliary rails where layout space and thermal management are constrained.
Availability
NCP3127ADR2G is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and medical imaging applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP3127ADR2G 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 NCP3127ADR2G belongs to onsemi's DC-DC converter portfolio designed for high-efficiency, space-constrained point-of-load regulation in harsh-environment applications with minimal external components.
FAQ
What is the recommended input capacitor configuration for NCP3127ADR2G?
The NCP3127ADR2G requires a minimum 22 µF X5R/X7R ceramic input capacitor placed within 5 mm of the VIN and PGND pins. A parallel combination of 10 µF + 2.2 µF improves high-frequency decoupling. Bulk capacitance must withstand 25 V rating due to possible input transients. Layout symmetry between VIN and PGND traces minimizes loop inductance critical for EMI performance in the NCP3127ADR2G design.
Does NCP3127ADR2G support adjustable switching frequency?
No, the NCP3127ADR2G operates at a fixed 300 kHz switching frequency determined by internal oscillator circuitry. This eliminates external frequency-setting components and ensures consistent EMI behavior across production units. Designers selecting the NCP3127ADR2G should size the output inductor and capacitors accordingly-typically 10 µH for ≤3 A loads-and verify ripple current ratings match the fixed frequency's RMS demands.
How does the NCP3127ADR2G handle overcurrent conditions?
The NCP3127ADR2G uses cycle-by-cycle current limiting with hiccup-mode recovery: when peak inductor current exceeds threshold, switching pauses for ~30 ms before retrying. This prevents thermal runaway during sustained shorts while enabling self-recovery once fault clears. Unlike latch-off protection, hiccup mode maintains system awareness-critical for remote or unattended NCP3127ADR2G deployments in industrial gateways and edge sensors.
Can NCP3127ADR2G be used in automotive applications?
Yes, the NCP3127ADR2G meets AEC-Q100 Grade 2 (−40°C to +105°C) qualification and supports automotive infotainment and ADAS sub-systems. Its 4.5–18 V input range accommodates cold-crank (6.5 V) and load-dump (27 V) transients when paired with appropriate input TVS. The NCP3127ADR2G's integrated FETs, PG signal, and thermal shutdown align with functional safety requirements for ASIL-B–capable power domains.
What is the thermal performance of NCP3127ADR2G in SOIC-8EP package?
In standard 2-layer PCB layout with 1-inch² 2-oz copper thermal pad connected to PGND, the NCP3127ADR2G achieves θJA ≈ 50°C/W. At 3 A load and 12 V input, junction temperature rise is ~65°C above ambient-well below 150°C shutdown threshold. For higher reliability, adding thermal vias under the exposed pad and using inner-layer copper pours further lowers θJA in NCP3127ADR2G implementations.
NCP3127ADR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 10.56V
- Current - Output:
- 2A
- Frequency - Switching:
- 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
NCP3127ADR2G FAQ
1.How can I place an order for NCP3127ADR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3127ADR2G 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 NCP3127ADR2G reliable?
The price and inventory of NCP3127ADR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3127ADR2G is usually 5 days.
3.What payment methods are accepted for NCP3127ADR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3127ADR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3127ADR2G?
NCP3127ADR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3127ADR2G 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 NCP3127ADR2G?
For technical support, including NCP3127ADR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3127ADR2G requirements.
6.How does Aetrix verify that NCP3127ADR2G is sourced from the original manufacturer or authorized distributors?
All NCP3127ADR2G 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 NCP3127ADR2G meets industry standards.
7.What is the process for return or replacement of NCP3127ADR2G?
All NCP3127ADR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP3127ADR2G, 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 NCP3127ADR2G part is unused and in its original packaging.
Return procedure for NCP3127ADR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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