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onsemi NCP5666DS25R4G
- Part No.:
- NCP5666DS25R4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
NCP5666DS25R4G.pdf
- Description:
- IC REG LINEAR 2.5V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,278
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Product details
Overview
NCP5666DS25R4G from onsemi is a 2.5 V, 3.0 A low dropout linear regulator with enable function, designed for high-power post-regulation in servers and ASIC power supplies. It delivers ±1% output voltage accuracy, 1.0 V typical dropout at 3.0 A, 57 µVrms output noise, and operates across –40°C to +85°C ambient temperature.
For engineers reviewing the NCP5666DS25R4G datasheet, pinout, applications, or equivalent options, key selection criteria include thermal performance in D2PAK package, ultra-fast load transient response (1–3 µs settling), ground current independence from load, PSRR > 65 dB at 1 kHz, and compatibility with ceramic/tantalum/aluminum output capacitors.
Technical Context
The NCP5666DS25R4G integrates a precision 0.9 V internal reference with resistor-divider feedback to set 2.5 V output, enabling stable regulation under varying line and load conditions. Its architecture features low ground current (≤3.0 mA at full load) and fast transient recovery via internal compensation optimized for 2.2–220 µF output capacitance.
Enable logic operates with 1.3 V turn-on and 0.3 V turn-off thresholds, supporting direct microcontroller interfacing without level-shifting. Thermal shutdown activates at ~160°C junction temperature, and current limiting clamps peak output to 4.5 A to prevent destructive power dissipation during overload or short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1% over –40°C to +85°C, ensuring tight regulation for sensitive digital core supplies. |
| Max Output Current | 3.0 A continuous, supporting high-current FPGA/ASIC rails without external pass devices. |
| Dropout Voltage | 1.0 V typical at 3.0 A, enabling operation with only 3.5 V input for 2.5 V output-critical for low-voltage margin systems. |
| Ground Current | ≤3.0 mA at 3.0 A load, independent of output current, minimizing wasted power in high-efficiency designs. |
| PSRR | ≥65 dB at 1 kHz, suppressing switching noise from upstream DC-DC converters in multi-rail power architectures. |
| Output Noise | 57 µVrms (10 Hz–100 kHz), eliminating need for bypass capacitor in noise-sensitive analog or RF subsystems. |
| Enable Threshold | Logic-compatible EN pin: turns on at ≥1.3 V, off at ≤0.3 V-directly drivable by 3.3 V or 1.8 V GPIO. |
Pinout & Package
Package: D2PAK (Case 936A), thermally enhanced surface-mount package with exposed tab for GND connection and low RθJC = 5.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. Vin | Positive power supply input | Accepts 3.5–9 V input; must be decoupled with 4.7–220 µF capacitor placed near pin for transient stability. |
| 2. EN | Enable control input | Active-high logic input; tie to Vin for always-on operation or drive with MCU GPIO for sequenced power-up. |
| 3 & Tab. GND | Power ground return path | Exposed metal tab is electrically connected to Pin 3 and must be soldered to large PCB copper pour for thermal management. |
| 4. NC | No-connect terminal | Internally unconnected; PCB traces allowed but no electrical function-no routing required. |
| 5. Vout | Regulated 2.5 V output | Delivers up to 3.0 A; requires 2.2–220 µF output capacitor placed adjacent to pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% output voltage accuracy | Ensures compliance with tight tolerance requirements of modern processor I/O and memory interface rails. |
| Ultra-fast transient response (1–3 µs) | Minimizes output voltage deviation during sudden load steps-critical for burst-mode digital loads like GPUs. |
| Stable with ceramic, tantalum, aluminum caps | Eliminates need for specialized low-ESR capacitors, reducing BOM cost and simplifying layout across diverse applications. |
| Thermal and current protection | Integrated 160°C thermal shutdown and 4.5 A current limit prevent damage during fault conditions without external circuitry. |
| Pb-free D2PAK package | Meets RoHS and JEDEC MSL Level 1 standards-suitable for lead-free reflow assembly without moisture sensitivity concerns. |
Applications
| Server Power Rails | ASIC Core Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 2.5 V power to high-speed SerDes lanes and PCIe PHYs in rack-mounted servers. IC Role / Device Role / Timing Role: Post-regulator LDO delivering low-noise, low-ripple voltage after primary DC-DC conversion. Use Value: 57 µVrms noise and 65 dB PSRR suppress switching artifacts that would otherwise degrade signal integrity and bit error rates. |
Use Scenario: Supplying configurable logic blocks and embedded memory in FPGAs requiring precise 2.5 V core voltage. IC Role / Device Role / Timing Role: High-current linear regulator maintaining voltage within ±25 mV under dynamic load transients. Use Value: 1–3 µs transient settling time prevents timing violations during rapid state changes in programmable logic fabric. |
| Networking Line Cards | Gaming Console SoC Power |
|
Use Scenario: Powering packet processing ASICs and Ethernet PHYs on telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, enable-controlled LDO isolating sensitive analog front-ends from noisy digital domains. Use Value: Enable function allows synchronized power sequencing with MAC controllers, while 1.0 V dropout enables efficient use of intermediate bus voltages. |
Use Scenario: Delivering stable 2.5 V to GPU shader cores and video memory interfaces in consumer gaming hardware. IC Role / Device Role / Timing Role: High-current LDO operating in thermally constrained chassis with forced-air cooling limitations. Use Value: D2PAK package with 5.0°C/W RθJC enables 3.0 A delivery without heatsink-reducing board space and system cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 2.5 V, 3.0 A, 0.6 V dropout, 6 µVrms noise, WQFN-20 package (RθJA = 32°C/W) | Lower noise and dropout, but requires external compensation and ceramic-only output capacitors. | Preferred when ultra-low noise (<10 µVrms) is mandatory and PCB area allows WQFN thermal pad layout. |
| MIC29302WU | 2.5 V, 3.0 A, 0.4 V dropout, 120 µVrms noise, TO-263 package, no enable pin | Lower dropout but higher noise and no enable function-requires external logic for sequencing. | Selected where minimal input-output differential is critical and enable control is handled externally. |
Compared with TPS7A8300RGRT and MIC29302WU, the NCP5666DS25R4G offers balanced performance: moderate dropout (1.0 V), industry-leading 57 µVrms noise without bypass cap, integrated enable, and robust D2PAK thermal capability-making it optimal for thermally demanding, noise-sensitive, and sequenced power systems.
Availability
NCP5666DS25R4G is available at Aetrix Electronics and suitable for server power rails, ASIC core supplies, and networking equipment requiring stable component supply, long-term lifecycle assurance, and Pb-free compliance.
Supply support for NCP5666DS25R4G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent edge applications.
The NCP5666DS25R4G belongs to onsemi's high-current LDO regulator product line, engineered specifically for post-regulation in high-density computing infrastructure where thermal robustness, transient performance, and reliability are non-negotiable.
FAQ
What is the maximum input voltage for the NCP5666DS25R4G?
The NCP5666DS25R4G supports an absolute maximum input voltage of 18 V, but its recommended operating input range is (Vout + VDO) to 9 V-i.e., 3.5 V to 9 V for the 2.5 V version. Operation above 9 V requires careful thermal management to avoid exceeding 30 W transient power dissipation limits in the D2PAK package.
Does the NCP5666DS25R4G require an external bypass capacitor for low-noise operation?
No, the NCP5666DS25R4G achieves 57 µVrms output noise (10 Hz–100 kHz) without any external bypass capacitor, thanks to its internal noise-reduction architecture. This eliminates BOM cost and layout complexity while maintaining performance across temperature and load variations.
How does the enable function of the NCP5666DS25R4G operate?
The NCP5666DS25R4G enable pin (Pin 2) is active-high with a 1.3 V turn-on threshold and 0.3 V turn-off threshold. When pulled to GND, the device shuts down with ≤300 µA disable current; when tied to Vin or driven by a 3.3 V/1.8 V GPIO, it enables regulation. No external pull-up is required for default-on operation.
Can the NCP5666DS25R4G be used with ceramic output capacitors?
Yes-the NCP5666DS25R4G is explicitly characterized and stable with ceramic, tantalum, and aluminum electrolytic output capacitors ranging from 2.2 µF to 220 µF. Its internal compensation eliminates the need for minimum ESR requirements, simplifying capacitor selection and improving reliability.
What thermal derating applies to the NCP5666DS25R4G at elevated ambient temperatures?
The NCP5666DS25R4G has RθJA = 45°C/W (measured on 650 mm² copper) and RθJC = 5.0°C/W. At 85°C ambient, maximum continuous power dissipation is limited to ~1.44 W (based on TJ(max) = 150°C), corresponding to ~1.4 A at 1.0 V dropout. Full 3.0 A operation requires heatsinking or forced airflow to maintain junction temperature below 150°C.
NCP5666DS25R4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 3 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 65dB (120Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
NCP5666DS25R4G FAQ
1.How can I place an order for NCP5666DS25R4G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP5666DS25R4G 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 NCP5666DS25R4G reliable?
The price and inventory of NCP5666DS25R4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP5666DS25R4G is usually 5 days.
3.What payment methods are accepted for NCP5666DS25R4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP5666DS25R4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP5666DS25R4G?
NCP5666DS25R4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP5666DS25R4G 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 NCP5666DS25R4G?
For technical support, including NCP5666DS25R4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP5666DS25R4G requirements.
6.How does Aetrix verify that NCP5666DS25R4G is sourced from the original manufacturer or authorized distributors?
All NCP5666DS25R4G 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 NCP5666DS25R4G meets industry standards.
7.What is the process for return or replacement of NCP5666DS25R4G?
All NCP5666DS25R4G units undergo pre-shipment inspection (PSI). If there is an issue with NCP5666DS25R4G, 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 NCP5666DS25R4G part is unused and in its original packaging.
Return procedure for NCP5666DS25R4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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