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onsemi NCP4688DMU18TCG
- Part No.:
- NCP4688DMU18TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP4688DMU18TCG.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
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Product details
Overview
NCP4688DMU18TCG from onsemi is a CMOS low-noise 150 mA LDO linear voltage regulator delivering a fixed 1.8 V output with ±1% accuracy, 10 µVRMS output noise, and 80 dB PSRR at 1 kHz - designed for powering noise-sensitive RF modules and portable communication equipment.
For engineers reviewing the NCP4688DMU18TCG datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (DFN 1.0×1.0 mm), validated thermal performance (RJA = 250 °C/W), enable-controlled power sequencing, and auto-discharge functionality critical for battery-powered systems.
Technical Context
The NCP4688DMU18TCG integrates a precision bandgap reference, low-noise error amplifier, and NMOS pass transistor with integrated autodischarge path. Its CE pin enables high-side control of output regulation, with internal pull-down ensuring safe default-off behavior when floating.
It operates across 2.0–5.25 V input while maintaining stable 1.8 V output under load currents up to 150 mA, with dropout voltage as low as 0.29 V at 150 mA. The DFN 1.0×1.0 mm package includes an exposed pad for thermal management and supports ceramic output capacitors ≥1.0 µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V with ±1% accuracy over −40°C to +85°C - ensures reliable logic-level supply for 1.8 V microcontrollers and RF ICs. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - minimizes phase noise in local oscillators and preserves signal integrity in RF front-ends. |
| PSRR | 80 dB at 1 kHz, 75 dB at 10 kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry. |
| Dropout Voltage | 0.29 V typical at 150 mA - enables operation from single-cell Li-ion (3.0 V min) or 3.3 V rails with margin for voltage sag. |
| Quiescent Current | 75 µA typical at VOUT ≤ 4.1 V - extends battery life in always-on sensor nodes and low-power IoT endpoints. |
| Enable Threshold | VCEH = 1.0 V min, VCEL = 0.4 V max - compatible with 1.8 V GPIOs and open-drain controllers without level-shifting. |
| Auto-Discharge RDS(ON) | 60 Ω typical - rapidly discharges output capacitance during shutdown, preventing hold-up voltage in multi-rail systems. |
Pinout & Package
Package: UDFN-4 (1.0 mm × 1.0 mm, 0.65 mm pitch), Case 517BR, Pb-free, with exposed thermal pad (EP) - optimized for space-constrained portable and RF designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.0–5.25 V; requires 1.0 µF ceramic decoupling capacitor placed adjacent to pin 4 (VIN) and pin 2 (GND). |
| GND | Ground reference | Common return for input/output circuits and CE logic; must be connected to PCB ground plane beneath exposed pad. |
| CE | Chip enable input | Active-high control: drives output ON when ≥1.0 V; internal 0.6 µA pull-down ensures OFF state if left floating. |
| VOUT | Regulated output | Delivers stable 1.8 V; requires 1.0 µF ceramic capacitor between pin 1 (VOUT) and GND for stability and transient response. |
| EP | Exposed thermal pad | Not electrically connected; must be soldered to PCB thermal plane or left floating - improves thermal resistance by ~30%. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 10 µVRMS output noise enables clean power for RF transceivers and high-resolution ADCs without external filtering. |
| High PSRR at RF frequencies | 75 dB at 10 kHz and 65 dB at 100 kHz suppresses noise from switching regulators used in hybrid power architectures. |
| Integrated auto-discharge | 60 Ω NMOS discharge path reduces VOUT decay time after shutdown - critical for safe power sequencing in multi-voltage systems. |
| Precision enable interface | Guaranteed VCEH/VCEL thresholds allow direct interfacing with 1.8 V logic and reduce BOM count vs. external enable circuitry. |
| Thermally efficient DFN | RJA = 250 °C/W enables 150 mA continuous operation at +70°C ambient without heatsinking in standard 2-layer PCB layouts. |
Applications
| RF Module Power Supply | Portable Communication Equipment |
|---|---|
Use Scenario: Powering 2.4 GHz BLE/Wi-Fi transceivers in compact wearables and IoT sensors. IC Role / Device Role / Timing Role: Primary LDO supplying VCC to RF ICs requiring ultra-low noise and fast load transient response. Use Value: 10 µVRMS noise prevents EVM degradation; 0.29 V dropout allows operation from partially discharged batteries. |
Use Scenario: Regulating 1.8 V core supply for baseband processors in handheld radios and satellite phones. IC Role / Device Role / Timing Role: Low-quiescent-current LDO enabling always-on monitoring mode with <75 µA standby draw. Use Value: CE-controlled shutdown and auto-discharge eliminate residual voltage that could cause latch-up during cold boot. |
| Industrial Sensor Node | Car Audio DSP Core |
Use Scenario: Providing stable 1.8 V bias to MEMS accelerometers and low-power ADCs in factory-floor condition monitors. IC Role / Device Role / Timing Role: Precision voltage source with ±1% accuracy over temperature - maintains measurement linearity across −40°C to +85°C. Use Value: 80 dB PSRR rejects noise from nearby motor drivers and PLC I/O circuits without additional LC filtering. |
Use Scenario: Supplying 1.8 V digital core voltage to audio DSPs in automotive infotainment head units. IC Role / Device Role / Timing Role: Secondary LDO post-regulator following a buck converter, isolating noise-sensitive DSP logic from switching artifacts. Use Value: Fast line/load transient response (<100 µs settling) prevents audio glitches during dynamic volume or EQ changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 150 mA, 1.8 V fixed, 6 µA IQ, but no CE pin or auto-discharge; PSRR = 60 dB @ 1 kHz. | Lacks enable control and rapid discharge - unsuitable for sequenced multi-rail systems or battery safety-critical shutdown. | Select only for ultra-low-IQ, non-sequenced applications where CE and discharge are unnecessary. |
| Torex XC6210B182MR-G | 150 mA, 1.8 V fixed, 25 µA IQ, CE pin, but no auto-discharge; PSRR = 70 dB @ 1 kHz; noise = 30 µVRMS. | Higher output noise limits use in RF; absence of discharge path risks back-powering in fault conditions. | Prefer where lower quiescent current is prioritized over RF-grade noise and safe shutdown behavior. |
Compared with MCP1700T-1802E/TT and XC6210B182MR-G, the NCP4688DMU18TCG uniquely combines RF-grade noise performance, integrated enable with guaranteed threshold margins, and active auto-discharge - making it the only choice for battery-powered RF systems requiring both precision regulation and safe power sequencing.
Availability
NCP4688DMU18TCG 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 NCP4688DMU18TCG 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 NCP4688DMU18TCG belongs to onsemi's precision LDO family engineered for noise-sensitive applications including RF, portable communications, and industrial sensing - emphasizing low noise, high PSRR, and robust enable control.
FAQ
What is the maximum input voltage rating for the NCP4688DMU18TCG?
The NCP4688DMU18TCG has an absolute maximum input voltage of 6 V. Operation above 5.25 V is outside the recommended operating range and may compromise output accuracy, PSRR, and long-term reliability. For sustained use, VIN must remain within 2.0–5.25 V per Table 4 of the datasheet.
Does the NCP4688DMU18TCG require external components for stability?
Yes - the NCP4688DMU18TCG requires two 1.0 µF ceramic capacitors: one between VIN and GND (C1), and one between VOUT and GND (C2). These are mandatory for stability, transient response, and PSRR performance. Tantalum capacitors are not recommended due to ESR-related instability risks.
How does the auto-discharge function operate in the NCP4688DMU18TCG?
When the CE pin is driven low, the NCP4688DMU18TCG activates an internal 60 Ω NMOS transistor between VOUT and GND, discharging the output capacitor. This feature eliminates residual voltage that could interfere with system reset or cause back-powering of upstream circuitry during shutdown sequences.
Can the NCP4688DMU18TCG be used with a 1.8 V GPIO to control the CE pin?
Yes - the NCP4688DMU18TCG CE pin has a guaranteed high threshold (VCEH ≥ 1.0 V) and low threshold (VCEL ≤ 0.4 V), making it fully compatible with 1.8 V logic outputs. No level shifter is needed, and the internal 0.6 µA pull-down ensures safe default-OFF behavior if the GPIO is unconfigured.
What thermal derating applies to the NCP4688DMU18TCG in a standard 2-layer PCB?
With the DFN 1.0×1.0 mm package mounted on a standard 2-layer FR-4 board (1 oz Cu, 1 cm² thermal pad), the NCP4688DMU18TCG exhibits RJA = 250 °C/W. At 25°C ambient, maximum continuous output current is ~120 mA before junction temperature exceeds 125°C - derate linearly above 25°C ambient per the thermal characteristics table.
NCP4688DMU18TCG 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):
- 0.41V @ 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)
NCP4688DMU18TCG FAQ
1.How can I place an order for NCP4688DMU18TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4688DMU18TCG 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 NCP4688DMU18TCG reliable?
The price and inventory of NCP4688DMU18TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4688DMU18TCG is usually 5 days.
3.What payment methods are accepted for NCP4688DMU18TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4688DMU18TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4688DMU18TCG?
NCP4688DMU18TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4688DMU18TCG 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 NCP4688DMU18TCG?
For technical support, including NCP4688DMU18TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4688DMU18TCG requirements.
6.How does Aetrix verify that NCP4688DMU18TCG is sourced from the original manufacturer or authorized distributors?
All NCP4688DMU18TCG 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 NCP4688DMU18TCG meets industry standards.
7.What is the process for return or replacement of NCP4688DMU18TCG?
All NCP4688DMU18TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4688DMU18TCG, 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 NCP4688DMU18TCG part is unused and in its original packaging.
Return procedure for NCP4688DMU18TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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