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onsemi NCP4688DMU28TCG
- Part No.:
- NCP4688DMU28TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP4688DMU28TCG.pdf
- Description:
- IC REG LINEAR 2.8V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,943
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Product details
Overview
NCP4688DMU28TCG from onsemi is a 150 mA, low-noise CMOS LDO linear voltage regulator delivering a fixed 2.8 V output with ±1% accuracy over −40°C to +85°C, 10 µVRMS output noise (10 Hz–100 kHz), and 80 dB PSRR at 1 kHz - designed for RF modules, portable communication equipment, and noise-sensitive analog circuitry.
For engineers reviewing the NCP4688DMU28TCG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (0.29 V @ 150 mA), auto-discharge NMOS (60 Ω), CE pin threshold (VCEH = 1.0 V min), thermal resistance (RJA = 250 °C/W in DFN 1.0×1.0 mm), and Pb-free DFN package compatibility with high-density PCB layouts.
Technical Context
The NCP4688DMU28TCG integrates a precision bandgap reference, low-noise error amplifier, and current-limit protection with an internal auto-discharge NMOS switch activated during disable mode. Its architecture supports stable operation with only 1.0 µF ceramic input/output capacitors and maintains regulation across 2.0–5.25 V input range.
It features active chip enable (CE "H" active), internal pull-down on CE (0.3–0.6 µA), and thermal shutdown. The DFN 1.0×1.0 mm package uses an exposed pad (EP) for enhanced thermal performance and requires no external components for basic operation beyond decoupling caps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±1% (−40°C to +85°C); ensures stable biasing for 2.8 V logic, RF ICs, and analog sensors without external feedback. |
| Max Output Current | 150 mA continuous; sufficient for powering single-core microcontrollers, Bluetooth SoCs, or sensor signal chains. |
| Dropout Voltage | 0.29 V typical @ 150 mA; enables operation from 3.09 V input, supporting battery-powered systems down to ~3.1 V. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz); minimizes phase noise in VCOs and jitter in ADC clock supplies. |
| PSRR | 80 dB @ 1 kHz, 75 dB @ 10 kHz; suppresses switching noise from DC-DC converters feeding the LDO input. |
| Quiescent Current | 75 µA typical (VOUT ≤ 4.1 V); extends battery life in always-on monitoring circuits. |
| Enable Threshold | VCEH ≥ 1.0 V, VCEL ≤ 0.4 V; compatible with 1.8 V/3.3 V GPIOs for precise power sequencing control. |
Pinout & Package
Package: UDFN-4 (1.0 mm × 1.0 mm, 0.65 mm pitch), Case 517BR, Pb-free, with exposed thermal pad (EP). Mounting footprint matches JEDEC MO-303.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 2.0–5.25 V; requires 1.0 µF ceramic capacitor placed adjacent to pin for line transient immunity. |
| 2 (GND) | Ground reference | Common return for input, output, and CE; must be connected to EP for optimal thermal and noise performance. |
| 3 (CE) | Chip enable control | Active-high digital input; internal 0.3–0.6 µA pull-down ensures safe default-off state if left floating. |
| 4 (VOUT) | Regulated output | Delivers 2.8 V ±1%; requires 1.0 µF ceramic capacitor near pin to ensure stability and load transient response. |
| EP | Exposed thermal pad | Not electrically connected; must be soldered to PCB ground plane to achieve RJA = 250 °C/W and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Low-output-noise regulation | 10 µVRMS noise floor enables clean power for RF front-ends and high-resolution ADCs without added filtering. |
| Auto-discharge function | Integrated 60 Ω NMOS between VOUT and GND discharges output cap rapidly on disable, preventing residual voltage hold-up. |
| High PSRR across frequency | 80 dB @ 1 kHz and 75 dB @ 10 kHz suppresses ripple from upstream DC-DC converters in mixed-signal systems. |
| Precision output accuracy | ±1% over temperature and line/load ensures reliable operation of 2.8 V I/O interfaces and memory peripherals. |
| Ultra-small DFN package | 1.0 mm × 1.0 mm footprint saves >60% board area vs. SOT-23-5, critical for space-constrained IoT and wearable designs. |
Applications
| RF Module Power | Portable Audio Bias |
|---|---|
|
Use Scenario: Powering 2.4 GHz Wi-Fi/BT transceivers (e.g., ESP32-WROOM-32) in battery-operated edge nodes. IC Role / Device Role / Timing Role: Primary 2.8 V LDO supplying VDD_IO and RF_VDD rails with ultra-low noise to minimize EVM degradation. Use Value: 10 µVRMS noise and 80 dB PSRR prevent transmit spectral regrowth and receiver desensitization. |
Use Scenario: Supplying headphone amplifier ICs (e.g., TPA6138A2) in cordless phones and Bluetooth headsets. IC Role / Device Role / Timing Role: Low-noise 2.8 V bias source for Class AB audio output stages requiring minimal THD+N. Use Value: ±1% accuracy maintains consistent gain calibration; 0.29 V dropout extends usable battery range down to 3.09 V. |
| Industrial Sensor Node | Automotive Infotainment Display |
|
Use Scenario: Regulating power for 2.8 V MEMS accelerometers and low-power ADCs in predictive maintenance gateways. IC Role / Device Role / Timing Role: Standby-optimized LDO enabling <75 µA quiescent current during sleep mode while retaining fast wake-up via CE pin. Use Value: CE-controlled on/off sequencing eliminates leakage paths; auto-discharge prevents false wake-ups from residual VOUT. |
Use Scenario: Providing 2.8 V supply to LCD bias drivers and touch controller ICs in automotive navigation displays. IC Role / Device Role / Timing Role: High-PSRR post-regulator cleaning ripple from 5 V DC-DC converter outputs in harsh automotive electrical environments. Use Value: 75 dB PSRR @ 10 kHz rejects alternator noise and ignition transients; AEC-Q100 qualified ESD robustness (2 kV HBM). |
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 output, 6 µA IQ, no CE pin or auto-discharge; SOT-23-3 package. | Lacks enable control and fast discharge - unsuitable for power-sequenced systems or rapid turn-off requirements. | Select when ultra-low IQ dominates over controllability; verify layout accommodates larger SOT-23-3 footprint. |
| Torex XC6210B282MR-G | 150 mA, 2.8 V, 25 µA IQ, CE pin, but 40 µVRMS noise and 60 dB PSRR @ 1 kHz. | Higher noise limits use in RF/analog signal chains; lower PSRR reduces immunity to DC-DC switching noise. | Choose for cost-sensitive industrial controls where noise/PSRR margins are relaxed and CE functionality is required. |
Compared with MCP1700T-2802E/TT and XC6210B282MR-G, the NCP4688DMU28TCG uniquely balances low noise (10 µVRMS), high PSRR (80 dB), CE control, and auto-discharge in a 1.0×1.0 mm DFN - making it optimal for compact, noise-critical RF and portable applications where all four attributes are simultaneously required.
Availability
NCP4688DMU28TCG is available at Aetrix Electronics and suitable for RF modules, portable communication equipment, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP4688DMU28TCG 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP4688DMU28TCG belongs to onsemi's NCP4688 family of low-noise, high-PSRR LDOs engineered specifically for noise-sensitive RF, wireless, and portable electronics where compact size and precision regulation are critical.
FAQ
What is the maximum input voltage rating for the NCP4688DMU28TCG?
The NCP4688DMU28TCG has an absolute maximum input voltage rating of 6 V. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input range is 2.0 V to 5.25 V - ensuring proper regulation and thermal margin under full 150 mA load at elevated ambient temperatures.
Does the NCP4688DMU28TCG require external capacitors, and what values are recommended?
Yes, the NCP4688DMU28TCG requires both input (CIN) and output (COUT) ceramic decoupling capacitors. The datasheet specifies 1.0 µF for each, placed as close as possible to their respective pins. Using higher capacitance or lower-ESR ceramics improves line/load transient response but is not required for basic stability.
How does the auto-discharge feature work in the NCP4688DMU28TCG?
When the CE pin is driven low, the NCP4688DMU28TCG activates an internal 60 Ω NMOS transistor between VOUT and GND. This provides a controlled discharge path for the output capacitor, reducing VOUT to near-zero within milliseconds - preventing unintended device wake-up or latch-up in power-sequenced systems.
Is the NCP4688DMU28TCG compatible with lead-free reflow processes?
Yes, the NCP4688DMU28TCG is a Pb-free device packaged in a RoHS-compliant UDFN-4 (Case 517BR) and qualified for standard lead-free reflow profiles per J-STD-020. Its maximum peak reflow temperature is 260°C, and the exposed pad must be soldered to PCB copper for thermal reliability.
What is the thermal resistance (RJA) of the NCP4688DMU28TCG in its DFN package?
The NCP4688DMU28TCG in the DFN 1.0×1.0 mm package has a junction-to-air thermal resistance (RJA) of 250 °C/W when mounted on a standard 4-layer PCB with the exposed pad fully soldered to an internal ground plane. Performance degrades significantly if the EP is left unconnected or undersized.
NCP4688DMU28TCG 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.28V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UDFN (1.0x1.0)
NCP4688DMU28TCG FAQ
1.How can I place an order for NCP4688DMU28TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4688DMU28TCG 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 NCP4688DMU28TCG reliable?
The price and inventory of NCP4688DMU28TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4688DMU28TCG is usually 5 days.
3.What payment methods are accepted for NCP4688DMU28TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4688DMU28TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4688DMU28TCG?
NCP4688DMU28TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4688DMU28TCG 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 NCP4688DMU28TCG?
For technical support, including NCP4688DMU28TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4688DMU28TCG requirements.
6.How does Aetrix verify that NCP4688DMU28TCG is sourced from the original manufacturer or authorized distributors?
All NCP4688DMU28TCG 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 NCP4688DMU28TCG meets industry standards.
7.What is the process for return or replacement of NCP4688DMU28TCG?
All NCP4688DMU28TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4688DMU28TCG, 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 NCP4688DMU28TCG part is unused and in its original packaging.
Return procedure for NCP4688DMU28TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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