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onsemi NCP4680DMX28TCG
- Part No.:
- NCP4680DMX28TCG
- Manufacturer:
- onsemi
- Package:
- 4-XFDFN Exposed Pad
- Datasheet:
-
NCP4680DMX28TCG.pdf
- Description:
- IC REG LINEAR 2.8V 150MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,118
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Product details
Overview
NCP4680DMX28TCG from onsemi is a 150 mA CMOS low-dropout linear voltage regulator with fixed 2.8 V output, housed in a 0.8×0.8 mm XDFN4 package. It delivers ±1.0% output voltage accuracy, 75 dB PSRR at 1 kHz, and 0.25 V dropout at 150 mA (VOUT = 2.8 V), enabling stable power for noise-sensitive communication ICs.
For engineers reviewing the NCP4680DMX28TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its auto-discharge capability, ceramic-capacitor stability (≥0.1 µF), ultra-low quiescent current (50 µA typ.), and thermal performance in compact portable designs.
Technical Context
The NCP4680DMX28TCG implements a fold-back current limit protection scheme and integrates an active pull-down transistor between VOUT and GND to enable fast output capacitor discharge during shutdown - a feature specific to the "D" variant. Its internal reference and error amplifier maintain regulation across −40°C to +85°C ambient.
This device operates from 1.40 V to 5.25 V input, supports 0.1 V output steps (2.8 V fixed here), and achieves 0.02%/V line regulation and 30 mV load regulation (1–150 mA). The XDFN4 package's exposed thermal pad (connected to GND) enables RJA = 350°C/W, critical for thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±1.0% over −40°C to +85°C - ensures precise biasing for 2.8 V logic rails and RF front-end circuitry. |
| Dropout Voltage | 0.25 V at IOUT = 150 mA - allows operation from 3.05 V input, supporting single-cell Li-ion or dual-cell alkaline systems. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog or RF loads. |
| Quiescent Current | 50 µA typical - extends battery life in always-on sensor nodes and low-power IoT endpoints. |
| Output Capacitor | Stable with ≥0.1 µF ceramic - eliminates need for bulky tantalum capacitors and reduces BOM cost and footprint. |
| Auto-Discharge | Integrated VOUT-to-GND discharge transistor - prevents residual voltage hold-up, satisfying system-level power sequencing requirements. |
| Thermal Resistance | RJA = 350°C/W (XDFN4) - requires minimal copper area for thermal relief in space-constrained wearables and modules. |
Pinout & Package
Package: XDFN4 (0.8 mm × 0.8 mm, 0.48 mm pitch), Pb-free, with exposed thermal pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.40–5.25 V; must be decoupled with 0.1 µF ceramic placed adjacent to pin 4 for transient immunity. |
| VOUT | Regulated output | Delivers 2.8 V ±1.0%; connects to 0.1 µF ceramic output cap and load; auto-discharged when CE = low. |
| GND | Ground reference | Common return for VIN, VOUT, CE; thermal pad (underside) is electrically tied to this node and must be soldered to PCB ground plane. |
| CE | Chip Enable control | Active-high logic input (VCEH = 1.0 V min); internal pull-down ensures default-off state; drives internal discharge transistor when low. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated NMOS switch discharges VOUT capacitor rapidly upon disable - eliminates external discharge resistors and meets strict power-down timing specs. |
| Low-noise regulation | 20 × VOUT µVrms (10 Hz–100 kHz) - preserves signal integrity in ADC reference supplies and RF synthesizer VCOs. |
| Ceramic-capacitor stability | Guaranteed stable with ≥0.1 µF X7R/X5R ceramics - avoids ESR dependency and simplifies layout vs. electrolytic/tantalum alternatives. |
| Fold-back current limiting | Reduces power dissipation during short-circuit events - limits junction temperature rise and enables self-recovery without latch-off. |
| Wide input range | Operates down to 1.40 V input - supports direct connection to partially discharged Li-ion cells (2.8 V nominal) or multi-cell alkaline stacks. |
Applications
| Wireless Sensor Node Power | USB-Powered Peripheral |
|---|---|
Use Scenario: Powering BLE SoC, environmental sensors, and flash memory in coin-cell or USB-powered edge devices. IC Role / Device Role / Timing Role: Primary LDO supplying 2.8 V core and I/O rails; auto-discharge ensures clean reset during USB detach. Use Value: 50 µA quiescent current extends battery life >5 years in sleep mode; 75 dB PSRR rejects USB 5 V DC/DC ripple. |
Use Scenario: Regulating 5 V USB input to 2.8 V for camera modules, audio codecs, or display drivers in portable accessories. IC Role / Device Role / Timing Role: Post-regulator after buck converter; provides low-noise, fast-transient response for burst-mode imaging or audio sampling. Use Value: 0.25 V dropout enables full 2.8 V output even as USB voltage sags to 4.75 V; 0.1 µF ceramic compatibility minimizes board area. |
| Industrial Control I/O Module | Medical Wearable Signal Chain |
Use Scenario: Supplying isolated 2.8 V logic for digital isolators and RS-485 transceivers in factory automation gateways. IC Role / Device Role / Timing Role: Local point-of-load regulator; CE pin synchronized with system wake/sleep commands via microcontroller GPIO. Use Value: Fold-back current limit protects against cable fault-induced shorts; ±1.0% accuracy maintains UART timing margin under load variation. |
Use Scenario: Powering ECG/PPG analog front-ends and low-power microcontrollers in FDA-cleared wearable patches. IC Role / Device Role / Timing Role: Ultra-low-noise 2.8 V supply for precision op-amps and SAR ADC references; auto-discharge prevents patient electrode charge retention. Use Value: 20 × VOUT µVrms noise ensures <1 LSB error in 12-bit medical ADCs; XDFN4 footprint fits sub-100 mm² flexible PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | Same 2.8 V fixed output, 250 mA rating, but no auto-discharge; SOT-23-5 package (larger than XDFN4). | Lacks integrated VOUT discharge - requires external resistor network for equivalent shutdown behavior. | Choose if higher output current headroom is needed and board space permits larger package. |
| Torex XC6219B282MR-G | 2.8 V fixed, 150 mA, 45 µA IQ, but no auto-discharge; SOT-25 package; PSRR = 65 dB @ 1 kHz. | Lower PSRR and missing discharge function limit suitability in high-speed digital or safety-critical power-down sequences. | Prefer where ultra-low IQ dominates design priority and discharge is handled externally or not required. |
Compared with MCP1700T-2802E/TT and XC6219B282MR-G, the NCP4680DMX28TCG uniquely combines auto-discharge, 75 dB PSRR, and 0.8×0.8 mm XDFN4 packaging - making it optimal for space-constrained, noise-sensitive, and fast-sequencing applications where residual output voltage must be actively cleared.
Availability
NCP4680DMX28TCG is available at Aetrix Electronics and suitable for wireless sensor nodes, USB-powered peripherals, industrial I/O modules, and medical wearables requiring stable component supply and long-term manufacturability.
Supply support for NCP4680DMX28TCG 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 electronics, delivering silicon solutions for automotive, industrial, cloud, and medical markets.
The NCP4680 series targets ultra-compact, low-noise power management in battery-operated and space-constrained systems - emphasizing minimal quiescent current, ceramic-capacitor compatibility, and integrated safety features like auto-discharge.
FAQ
What is the maximum input voltage rating for the NCP4680DMX28TCG?
The NCP4680DMX28TCG has an absolute maximum input voltage of 6.0 V. Operation above this level risks permanent damage. For reliable continuous use, the recommended operating input range is 1.40 V to 5.25 V - ensuring proper regulation and thermal margin across all load and temperature conditions for the NCP4680DMX28TCG.
Does the NCP4680DMX28TCG require an external discharge resistor?
No, the NCP4680DMX28TCG does not require an external discharge resistor. Its "D" suffix denotes integrated auto-discharge functionality: an internal NMOS transistor actively pulls VOUT to GND when the CE pin is driven low. This eliminates leakage paths and ensures rapid, controlled discharge of output capacitance - a key differentiator of the NCP4680DMX28TCG versus standard LDOs.
Can the NCP4680DMX28TCG operate with a 0.1 µF ceramic output capacitor?
Yes, the NCP4680DMX28TCG is explicitly designed and tested for stability with a minimum 0.1 µF ceramic output capacitor (X7R or X5R dielectric). This eliminates ESR dependency and simplifies layout - unlike many older LDOs that require higher-ESR tantalum or aluminum electrolytic capacitors. Using 0.1 µF ceramic ensures optimal transient response and noise performance for the NCP4680DMX28TCG.
What is the dropout voltage of the NCP4680DMX28TCG at full load?
The dropout voltage of the NCP4680DMX28TCG is 0.25 V at IOUT = 150 mA and VOUT = 2.8 V. This value is measured under specified test conditions (TA = +25°C) and confirms the device can maintain regulation with only 3.05 V input - critical for extending runtime in single-cell Li-ion or multi-cell alkaline applications using the NCP4680DMX28TCG.
How does the CE pin function on the NCP4680DMX28TCG?
The CE (Chip Enable) pin on the NCP4680DMX28TCG is an active-high digital control input. When CE ≥ 1.0 V, the regulator enables and delivers 2.8 V to the load; when CE ≤ 0.4 V, it disables, reducing supply current to ≤1.0 µA and activating the internal VOUT-to-GND discharge transistor. This precise threshold and integrated discharge define the power-control behavior unique to the NCP4680DMX28TCG.
NCP4680DMX28TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 70 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-XDFN (0.8x0.8)
NCP4680DMX28TCG FAQ
1.How can I place an order for NCP4680DMX28TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4680DMX28TCG 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 NCP4680DMX28TCG reliable?
The price and inventory of NCP4680DMX28TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4680DMX28TCG is usually 5 days.
3.What payment methods are accepted for NCP4680DMX28TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4680DMX28TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4680DMX28TCG?
NCP4680DMX28TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4680DMX28TCG 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 NCP4680DMX28TCG?
For technical support, including NCP4680DMX28TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4680DMX28TCG requirements.
6.How does Aetrix verify that NCP4680DMX28TCG is sourced from the original manufacturer or authorized distributors?
All NCP4680DMX28TCG 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 NCP4680DMX28TCG meets industry standards.
7.What is the process for return or replacement of NCP4680DMX28TCG?
All NCP4680DMX28TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4680DMX28TCG, 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 NCP4680DMX28TCG part is unused and in its original packaging.
Return procedure for NCP4680DMX28TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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