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onsemi NCP4683DSQ28T1G
- Part No.:
- NCP4683DSQ28T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP4683DSQ28T1G.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
NCP4683DSQ28T1G from onsemi is a 300 mA CMOS low-dropout linear voltage regulator with fixed 2.8 V output, ±1.0% accuracy (VOUT > 2.0 V), 0.25 V dropout at 300 mA, and chip enable functionality. It operates from 1.40 V to 5.25 V input and delivers stable power for space-constrained portable electronics requiring low quiescent current and high PSRR.
For engineers reviewing the NCP4683DSQ28T1G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative options for battery-powered and communication equipment designs.
Technical Context
The NCP4683DSQ28T1G integrates a precision bandgap reference, error amplifier, and N-channel pass transistor in a single SC−70−5 package. Its fold-back current limit and auto-discharge function (D-version) enable safe operation during overloads and fast shutdown recovery.
Designed for ceramic-capacitor stability (≥1.0 µF), it achieves 70 dB PSRR at 1 kHz and ±80 ppm/°C output voltage temperature coefficient - critical for noise-sensitive analog and RF subsystems powered from shared rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V, ±1.0% accuracy above 2.0 V ensures tight regulation for 2.8 V I/O domains and sensor biasing. |
| Max Output Current | 300 mA continuous - sufficient for powering microcontrollers, PMICs, or interface ICs in compact devices. |
| Dropout Voltage | 0.25 V at 300 mA (VOUT = 2.8 V) enables operation down to 3.05 V input - ideal for single-cell Li-ion or 3.3 V rail derating. |
| Quiescent Current | 50 µA typical - minimizes standby power loss in always-on battery applications like IoT sensors. |
| PSRR | 70 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Package | SC−70−5 (Case 419A−02), 1.8 × 1.15 mm footprint - supports high-density PCB layouts in portable equipment. |
| Enable Threshold | VCEH = 1.0 V min - compatible with 1.8 V GPIO logic without level-shifting. |
Pinout & Package
SC−70−5 package (Case 419A−02), 1.8 mm × 1.15 mm body, 0.65 mm pitch, Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 1.40–5.25 V; requires ≥1 µF ceramic decoupling close to pin for transient immunity. |
| GND (Pin 2) | Ground reference | Common return path for VIN, VOUT, and CE; must be low-impedance for PSRR and thermal performance. |
| CE (Pin 3) | Chip enable control | Active-high logic input; internal pull-down allows tie-to-VIN for always-on operation. |
| VOUT (Pin 4) | Regulated output | Delivers 2.8 V ±1.0%; requires ≥1 µF ceramic output capacitor for stability and load transient response. |
| NC (Pin 5) | No connection | Unused terminal; must remain unconnected per datasheet - no internal bond or circuitry attached. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | D-version includes internal VOUT-to-GND discharge transistor - reduces output decay time during disable, preventing back-powering of downstream circuits. |
| Ceramic capacitor stability | Stable with ≥1.0 µF X5R/X7R ceramic output cap - eliminates need for bulk tantalum or electrolytic capacitors, saving board space and cost. |
| Fold-back current limit | Reduces output current and voltage under overload - protects IC and source supply during short-circuit events without latch-up. |
| Low thermal resistance | RJA = 263 °C/W (SC−70) - enables 300 mA operation up to +85°C ambient with minimal heatsinking. |
| High ripple rejection | 70 dB PSRR at 1 kHz - maintains clean 2.8 V rail despite noisy 3.3 V or 5 V switcher inputs. |
Applications
| Wireless Sensor Node Power | USB-C Peripheral Bias Rail |
|---|---|
Use Scenario: Ultra-low-power IoT sensor node powered by coin cell or energy harvester, requiring regulated 2.8 V for RF transceiver and MCU core. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.8 V supply with enable control synchronized to wake/sleep cycles. Use Value: 50 µA quiescent current extends battery life; auto-discharge prevents leakage into disabled RF section during sleep. |
Use Scenario: USB-C accessory (e.g., dongle or hub) deriving 2.8 V from 5 V VBUS for USB PHY or display interface ICs. IC Role / Device Role / Timing Role: Post-regulator stabilizing switched 5 V input against USB load transients and cable drop. Use Value: 0.25 V dropout allows full 2.8 V output even at VBUS low-end (4.75 V); 70 dB PSRR rejects USB switcher noise. |
| Camera Module Core Supply | Industrial Control I/O Interface |
Use Scenario: Compact camera module (DVR, STB) needing precise 2.8 V for image sensor analog front-end and ISP core logic. IC Role / Device Role / Timing Role: Low-noise local regulator isolating sensitive analog circuitry from noisy digital supplies. Use Value: ±1.0% output accuracy ensures consistent ADC reference and sensor bias; ±80 ppm/°C tempco maintains calibration across operating range. |
Use Scenario: Programmable logic controller (PLC) I/O module requiring isolated 2.8 V for RS-485 transceiver bias and level-shifting. IC Role / Device Role / Timing Role: Point-of-load regulator converting 3.3 V system rail to 2.8 V for differential bus drivers. Use Value: SC−70 package fits dense I/O connector zones; fold-back protection survives field-induced bus shorts without damage. |
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 | 250 mA max output, 6 µA IQ, no enable pin, SOT-23-3 package | Lacks CE control and auto-discharge; lower current rating limits use in 300 mA loads | Select when ultra-low IQ dominates over enable control and higher current capability. |
| Torex XC6206P282MR-G | 300 mA, 15 µA IQ, no enable, SOT-23-3, no auto-discharge | Missing CE and discharge functions; smaller package but no active control interface | Choose for cost-sensitive, always-on 2.8 V rails where enable sequencing is unnecessary. |
Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the NCP4683DSQ28T1G uniquely combines 300 mA output, active enable, and auto-discharge in SC−70-enabling dynamic power management in battery-constrained systems where fast shutdown and controlled turn-on are required.
Availability
NCP4683DSQ28T1G is available at Aetrix Electronics and suitable for wireless sensor nodes, USB-C peripherals, camera modules, and industrial I/O interfaces requiring stable component supply, automotive-grade reliability, and long-term production continuity.
Supply support for NCP4683DSQ28T1G 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 specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The NCP4683 series targets portable and communication equipment requiring ultra-small, high-accuracy LDOs with enable and auto-discharge - addressing design needs in battery-powered cameras, STBs, and networking gear.
FAQ
What is the maximum input voltage rating for the NCP4683DSQ28T1G?
The NCP4683DSQ28T1G has an absolute maximum input voltage of 6.0 V. Operation beyond this rating risks permanent damage. For reliable long-term use, the recommended operating input range is 1.40 V to 5.25 V, as specified in the Electrical Characteristics table. This range ensures optimal dropout performance and thermal safety at 300 mA load.
Does the NCP4683DSQ28T1G require external capacitors, and what values are recommended?
Yes, the NCP4683DSQ28T1G requires both input and output ceramic capacitors. A minimum 1.0 µF X5R or X7R ceramic capacitor is required on the input (VIN–GND) and output (VOUT–GND) pins, placed as close as possible to the device. Larger values improve line/load transient response and PSRR, but the regulator remains stable with ≥1.0 µF - eliminating need for tantalum or electrolytic types.
How does the auto-discharge feature of the NCP4683DSQ28T1G operate?
The NCP4683DSQ28T1G (D-version) includes an internal N-channel transistor between VOUT and GND that activates during disable (CE = low). This discharges the output capacitor rapidly, preventing residual voltage from back-powering downstream circuitry. Discharge time depends on COUT value and load - typical decay is sub-millisecond for 1 µF, enabling clean power sequencing in multi-rail systems.
What is the thermal performance of the NCP4683DSQ28T1G in its SC−70 package?
In the SC−70−5 package, the NCP4683DSQ28T1G has a junction-to-air thermal resistance (RJA) of 263 °C/W. At 300 mA output with 2.8 V VOUT and 3.3 V VIN (0.5 V dropout), power dissipation is 150 mW - resulting in ~39 °C junction rise above ambient. With proper PCB copper area, it sustains full load up to +85 °C ambient without derating.
Is the NCP4683DSQ28T1G pin-compatible with other variants in the NCP4683 family?
Yes, all NCP4683 SC−70−5 variants (e.g., NCP4683DSQ18T1G, NCP4683DSQ33T1G) share identical pinout and footprint. Only the marked output voltage differs - allowing voltage-scaling design reuse without layout changes. However, the D-version (auto-discharge) and H-version (standard) differ internally; mixing them requires verification of discharge requirements in the target application.
NCP4683DSQ28T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-88A (SC-70-5/SOT-353)
NCP4683DSQ28T1G FAQ
1.How can I place an order for NCP4683DSQ28T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4683DSQ28T1G 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 NCP4683DSQ28T1G reliable?
The price and inventory of NCP4683DSQ28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4683DSQ28T1G is usually 5 days.
3.What payment methods are accepted for NCP4683DSQ28T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4683DSQ28T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4683DSQ28T1G?
NCP4683DSQ28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4683DSQ28T1G 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 NCP4683DSQ28T1G?
For technical support, including NCP4683DSQ28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4683DSQ28T1G requirements.
6.How does Aetrix verify that NCP4683DSQ28T1G is sourced from the original manufacturer or authorized distributors?
All NCP4683DSQ28T1G 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 NCP4683DSQ28T1G meets industry standards.
7.What is the process for return or replacement of NCP4683DSQ28T1G?
All NCP4683DSQ28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4683DSQ28T1G, 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 NCP4683DSQ28T1G part is unused and in its original packaging.
Return procedure for NCP4683DSQ28T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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