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onsemi NCP4683DMU18TCG
- Part No.:
- NCP4683DMU18TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP4683DMU18TCG.pdf
- Description:
- IC REG LINEAR 1.8V 300MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,355
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Product details
Overview
NCP4683DMU18TCG from onsemi is a 300 mA CMOS low-dropout linear voltage regulator with fixed 1.8 V output, ±1.0% accuracy (VOUT > 2.0 V), 0.25 V dropout at 300 mA/2.8 V, and integrated chip enable (active-high) for power management. It delivers stable regulation for noise-sensitive analog and digital rails in portable communication equipment.
For engineers reviewing the NCP4683DMU18TCG datasheet, pinout, applications, or equivalent options, this page provides verified specifications, package mapping to UDFN4 1.0 × 1.0 mm, thermal resistance (RJA = 250 °C/W), PSRR (70 dB @ 1 kHz), and ceramic-capacitor stability (≥1.0 µF).
Technical Context
The NCP4683DMU18TCG employs a CMOS pass transistor architecture with fold-back current limiting and internal reference trimming for high DC accuracy. Its enable logic accepts active-high CE input with 1.0 V threshold and 0.3 µA pull-down current, supporting controlled power sequencing.
Designed for low-noise operation, it achieves 65 µVrms output noise (10 Hz–100 kHz) and maintains stability with ≥1.0 µF ceramic output capacitance. The device operates across −40°C to +85°C ambient and supports input voltages from 1.40 V to 5.25 V - enabling direct use with single Li-ion, multi-cell alkaline, or post-regulated system rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1.0% (at TA = +25°C, VOUT > 2.0 V); ensures precise core voltage for 1.8 V I/O domains and low-power microcontrollers. |
| Max Output Current | 300 mA continuous; sufficient for powering multiple low-power peripherals (e.g., sensors, RF transceivers, memory interfaces) without external boost stages. |
| Dropout Voltage | 0.25 V @ IOUT = 300 mA, VOUT = 2.8 V; enables efficient regulation even when input drops to ~2.05 V for 1.8 V output - critical for battery end-of-life operation. |
| PSRR | 70 dB @ 1 kHz; suppresses switching noise from upstream DC-DC converters, preserving signal integrity in ADCs and PLLs. |
| Quiescent Current | 50 µA typical; minimizes standby power loss in always-on subsystems such as real-time clocks or wake-up controllers. |
| Thermal Resistance | RJA = 250 °C/W (UDFN4); requires minimal PCB copper area for thermal relief under full load at +70°C ambient. |
| Capacitor Stability | Stable with ≥1.0 µF ceramic output capacitor; eliminates need for costly tantalum or polymer capacitors and simplifies BOM. |
Pinout & Package
Package: UDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed thermal pad connected to GND (Case 517BR). Pin 1 marked by corner chamfer; tab is internally tied to GND and recommended to be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output voltage node | Delivers clean 1.8 V supply; must be decoupled with ≥1.0 µF ceramic capacitor placed adjacent to pin. |
| GND | Power and reference ground | Common return for input, output, and CE; connects to exposed thermal pad - essential for thermal performance and noise control. |
| CE | Chip enable input (active-high) | Logic-high ≥1.0 V enables regulation; logic-low ≤0.4 V disables output and reduces quiescent current to ≤1.0 µA. |
| VIN | Input voltage supply | Accepts 1.40–5.25 V; requires local 1.0 µF ceramic decoupling to minimize line transient overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | D-version includes internal N-channel discharge transistor between VOUT and GND, actively sinking output capacitance during disable - prevents residual voltage hold-up in power sequencing. |
| High PSRR at low frequency | 70 dB @ 1 kHz enables robust rejection of ripple from buck converter switching frequencies and their harmonics, protecting sensitive analog circuitry. |
| Low dropout with CMOS pass element | 0.25 V dropout at full 300 mA load allows extended battery runtime in 1.8 V systems powered from single-cell Li-ion (2.8–4.2 V) or dual-alkaline sources. |
| Ultra-low quiescent current | 50 µA typical supply current supports >1-year battery life in coin-cell-powered IoT endpoints operating intermittently. |
| Stable with small ceramic capacitors | No ESR requirements; compatible with 0402/0603 1.0 µF X5R/X7R MLCCs - reduces board area, cost, and ESL-related instability vs. tantalum alternatives. |
Applications
| Battery-Powered IoT Sensors | Portable Communication Modules |
|---|---|
Use Scenario: Ultra-low-power environmental sensor node powered by CR2032 coin cell, sampling temperature/humidity every 5 minutes and transmitting via BLE. IC Role / Device Role / Timing Role: Primary 1.8 V LDO supplying MCU core, BLE radio, and precision ADC - enabled only during active measurement/transmit windows. Use Value: 50 µA quiescent current and auto-discharge prevent leakage-induced voltage hold-up, extending battery life beyond 2 years per ANSI/ISA-100.11a duty-cycle profiles. | Use Scenario: Compact Wi-Fi 6 client module in handheld medical scanner requiring clean 1.8 V I/O supply with fast transient response to burst data transfers. IC Role / Device Role / Timing Role: Local point-of-load regulator for WLAN chipset I/O banks, rejecting noise from shared 3.3 V SMPS rail. Use Value: 70 dB PSRR at 1 kHz and <500 ns load transient recovery (per Figure 40) maintain signal integrity during 802.11ax packet bursts without additional filtering. |
| Industrial Camera Image Signal Processors | Smart Home Hub Power Management |
Use Scenario: 1080p camera module with rolling-shutter CMOS sensor and ISP, operating from 3.6 V Li-ion battery with strict 1.8 V analog supply tolerance. IC Role / Device Role / Timing Role: Dedicated 1.8 V analog rail regulator for sensor analog front-end and ISP reference voltage, isolated from digital switching noise. Use Value: ±1.0% output accuracy over −40°C to +85°C and 65 µVrms noise ensure consistent image quality and low fixed-pattern noise across temperature extremes. | Use Scenario: Voice-controlled smart speaker hub integrating Zigbee, Thread, and Bluetooth radios - each requiring independent, sequenced 1.8 V supplies. IC Role / Device Role / Timing Role: One of multiple NCP4683 variants used in hierarchical enable-tree architecture, where CE pins are driven by system PMIC GPIOs. Use Value: Active-high CE with 1.0 V threshold and 0.3 µA pull-down enables reliable interfacing with 1.8 V logic-level PMIC outputs without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-1802E/MB | 300 mA, 1.8 V fixed, 6 µA IQ, no CE pin, SOT-23 package | Lacks enable control and auto-discharge; suited for always-on, ultra-low-IQ applications only | Select when CE functionality is unnecessary and board space permits larger SOT-23 footprint. |
| Torex XC6219B182MR-G | 300 mA, 1.8 V fixed, 25 µA IQ, CE pin (active-low), SOT-25 package | Active-low CE requires inversion logic; no auto-discharge; slightly lower IQ but higher dropout (0.35 V @ 300 mA) | Choose for cost-sensitive designs where active-low enable is acceptable and thermal margin allows higher dropout. |
Compared with MCP1703T-1802E/MB and XC6219B182MR-G, the NCP4683DMU18TCG uniquely combines active-high CE, auto-discharge, and 0.25 V dropout in a 1.0 × 1.0 mm UDFN - making it optimal for space-constrained, sequenced, battery-critical systems where residual voltage must be cleared rapidly.
Availability
NCP4683DMU18TCG is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable communication modules, and industrial camera image signal processors requiring stable component supply, automotive-grade reliability (AEC-Q100 stress-tested), and long-term production continuity.
Supply support for NCP4683DMU18TCG 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 manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP4683 series belongs to onsemi's precision LDO portfolio, engineered specifically for ultra-low-noise, low-quiescent-current regulation in space- and power-constrained portable electronics - emphasizing ceramic-capacitor compatibility and fast transient response.
FAQ
What is the maximum input voltage rating for the NCP4683DMU18TCG?
The absolute maximum input voltage for the NCP4683DMU18TCG is 6.0 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable long-term use, the recommended operating input range is 1.40 V to 5.25 V - ensuring proper regulation and thermal safety under all load and temperature conditions defined in the datasheet.
Does the NCP4683DMU18TCG require an external resistor network to set output voltage?
No, the NCP4683DMU18TCG is a fixed-output regulator with factory-trimmed 1.8 V output. It does not support adjustable output via external resistors. The "DMU" suffix denotes the UDFN4 package with auto-discharge functionality, and the "18" in the part number explicitly indicates the 1.8 V nominal output voltage - eliminating need for feedback components and reducing design complexity.
How does the auto-discharge feature of the NCP4683DMU18TCG operate?
The NCP4683DMU18TCG (D-version) integrates an internal N-channel transistor between VOUT and GND that activates automatically when the CE pin is driven low. This discharges the output capacitor rapidly, preventing residual voltage from holding up downstream circuitry during power-down sequences - critical for deterministic reset behavior in multi-rail systems and compliance with IEC 62368-1 safe discharge requirements.
Can the NCP4683DMU18TCG be used with tantalum output capacitors?
No - the NCP4683DMU18TCG is optimized for ceramic capacitors ≥1.0 µF and may become unstable with high-ESR tantalum capacitors. The datasheet explicitly warns that using tantalum capacitors with high ESR can cause loop oscillation. For reliable operation, only X5R or X7R ceramic MLCCs meeting the 1.0 µF minimum and low-ESR requirements should be used on the output.
What is the thermal performance of the NCP4683DMU18TCG in its UDFN4 package?
The NCP4683DMU18TCG in UDFN4 (Case 517BR) has a junction-to-air thermal resistance (RJA) of 250 °C/W. At 300 mA load and 1.8 V output (0.54 W dissipation), this yields a worst-case junction temperature rise of 135 °C above ambient - meaning operation at +85°C ambient requires careful PCB layout (e.g., 2+ oz copper, thermal vias under the exposed pad) to stay within the −40°C to +150°C junction limit.
NCP4683DMU18TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-UDFN 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.39V @ 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:
- 4-UDFN (1x1)
NCP4683DMU18TCG FAQ
1.How can I place an order for NCP4683DMU18TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4683DMU18TCG 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 NCP4683DMU18TCG reliable?
The price and inventory of NCP4683DMU18TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4683DMU18TCG is usually 5 days.
3.What payment methods are accepted for NCP4683DMU18TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4683DMU18TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4683DMU18TCG?
NCP4683DMU18TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4683DMU18TCG 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 NCP4683DMU18TCG?
For technical support, including NCP4683DMU18TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4683DMU18TCG requirements.
6.How does Aetrix verify that NCP4683DMU18TCG is sourced from the original manufacturer or authorized distributors?
All NCP4683DMU18TCG 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 NCP4683DMU18TCG meets industry standards.
7.What is the process for return or replacement of NCP4683DMU18TCG?
All NCP4683DMU18TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4683DMU18TCG, 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 NCP4683DMU18TCG part is unused and in its original packaging.
Return procedure for NCP4683DMU18TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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