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onsemi NCP4688DMU25TCG
- Part No.:
- NCP4688DMU25TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP4688DMU25TCG.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,519
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Product details
Overview
NCP4688DMU25TCG from onsemi is a 150 mA, low-noise CMOS LDO linear voltage regulator delivering a fixed 2.5 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 powering noise-sensitive RF modules and precision analog circuitry in portable industrial and communication equipment.
For engineers reviewing the NCP4688DMU25TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its DFN 1.0×1.0 mm package with auto-discharge capability, dropout voltage of 0.25 V (typ) at 150 mA, and guaranteed operation across 2.0–5.25 V input range with CE-controlled enable functionality.
Technical Context
The NCP4688DMU25TCG integrates a CMOS pass element, precision bandgap reference, and internal noise-reduction circuitry to maintain ultra-low output noise independent of output voltage. Its CE pin features an internal pull-down current source (0.3–0.6 µA) ensuring reliable disable-state behavior when floating.
It implements an auto-discharge NMOS (RDS(ON) = 60 Ω) between VOUT and GND activated during shutdown, enabling rapid output capacitor discharge - critical for systems requiring fast power sequencing or low standby leakage. Thermal protection is inherent via junction temperature limit of 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% (−40°C to +85°C); ensures stable biasing for ADC references and RF ICs without external feedback. |
| Max Output Current | 150 mA continuous; supports moderate-power microcontrollers, sensors, and RF front-end stages. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz); enables clean supply for low-phase-noise VCOs and high-resolution SAR ADCs. |
| PSRR | 80 dB @ 1 kHz, 75 dB @ 10 kHz; suppresses switching noise from upstream DC/DC converters in mixed-signal systems. |
| Dropout Voltage | 0.25 V (typ) @ 150 mA; allows operation from 2.75 V input while maintaining 2.5 V output - ideal for single-cell Li-ion or 3.3 V rail derivation. |
| Enable Threshold | VCEH = 1.0 V min, VCEL = 0.4 V max; compatible with 1.8 V and 3.3 V logic-level control signals without level-shifting. |
| Package | UDFN-4 (1.0 × 1.0 mm, 0.65 mm pitch); supports high-density PCB layouts in space-constrained portable designs. |
Pinout & Package
Package: UDFN-4 (Case 517BR), 1.0 mm × 1.0 mm footprint, 0.65 mm pitch, exposed pad (EP) - intended to be left floating or connected to GND for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply pin | Accepts 2.0–5.25 V input; requires 1.0 µF ceramic decoupling capacitor placed adjacent to pin for stability and transient response. |
| GND | Ground reference | Common return path for input/output currents and internal regulation circuitry; connects to EP for improved thermal dissipation. |
| CE | Chip enable input | Active-high logic control (VCEH ≥ 1.0 V); internal 0.3–0.6 µA pull-down ensures default OFF state if unconnected. |
| VOUT | Regulated output | Delivers fixed 2.5 V ±1%; requires 1.0 µF ceramic output capacitor close to pin to ensure loop stability and load transient performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low output noise | 10 µVRMS (10 Hz–100 kHz) - preserves signal integrity in RF receivers and precision analog signal chains. |
| Auto-discharge function | Integrated 60 Ω NMOS between VOUT and GND - discharges output capacitance rapidly during disable, preventing residual voltage hold-up. |
| High PSRR | 80 dB @ 1 kHz - rejects ripple from noisy switchers, enabling clean LDO supply in hybrid power architectures. |
| Ultra-small footprint | DFN 1.0 × 1.0 mm (0.65 mm pitch) - reduces board area by >60% vs. SOT-23-5, supporting miniaturized IoT and wearable designs. |
| Precision output accuracy | ±1% over full temperature and load range - eliminates need for post-production calibration in industrial sensor nodes. |
Applications
| RF Module Power | Portable Sensor Node |
|---|---|
|
Use Scenario: Powering 2.4 GHz BLE transceiver ICs and low-noise amplifiers in compact wireless modules. IC Role / Device Role / Timing Role: Provides ultra-low-noise 2.5 V bias for RF synthesizers and mixer stages. Use Value: 10 µVRMS noise and 80 dB PSRR prevent phase noise degradation and spurious emissions in RF transmission. |
Use Scenario: Supplying 2.5 V to 16-bit SAR ADCs and MEMS accelerometers in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Delivers stable, accurate reference voltage for analog signal conditioning and data acquisition. Use Value: ±1% output accuracy and <0.1%/V line regulation ensure measurement repeatability across varying battery voltage (2.8–4.2 V). |
| Industrial HMI Display | Car Audio DSP Core |
|
Use Scenario: Regulating 2.5 V for touch controller ICs and display driver logic in factory-floor HMIs. IC Role / Device Role / Timing Role: Supplies low-noise, enable-controllable power to digital interface circuitry with fast turn-on/turn-off. Use Value: CE pin with 1.0 V threshold enables direct GPIO control from 3.3 V MCU; auto-discharge prevents ghost touch after power-down. |
Use Scenario: Powering 2.5 V core rails of automotive-grade audio DSPs in infotainment head units. IC Role / Device Role / Timing Role: Acts as secondary LDO stage downstream of main 5 V DC/DC converter. Use Value: 75 dB PSRR @ 10 kHz suppresses high-frequency switching noise from upstream buck converter, reducing audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/MB | 250 mA rating, 6 µVRMS noise, SOT-23-3 package (no CE pin), no auto-discharge | Lacks enable control and output discharge - unsuitable for sequenced power-down or fast wake-up systems | Select when higher current headroom is needed and CE/auto-discharge are not required; verify thermal derating in DFN footprint. |
| Torex XC6209B25MR-G | 150 mA, 2.5 V fixed, 40 µVRMS noise, SOT-25 package with CE, no auto-discharge | Higher output noise degrades RF/analog performance; lacks integrated discharge path for output capacitor | Use where cost sensitivity outweighs noise requirements; add external discharge FET if fast VOUT decay is mandatory. |
Compared with MCP1700T-2502E/MB and XC6209B25MR-G, the NCP4688DMU25TCG uniquely combines ultra-low noise, enable control, and integrated auto-discharge in a 1.0×1.0 mm DFN - making it optimal for space-constrained, noise-critical, and fast-sequencing applications where all three features are simultaneously required.
Availability
NCP4688DMU25TCG is available at Aetrix Electronics and suitable for RF modules, portable sensor nodes, industrial HMIs, and automotive audio systems requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP4688DMU25TCG 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 NCP4688DMU25TCG belongs to onsemi's precision low-noise LDO family, engineered specifically for noise-sensitive applications in portable RF, instrumentation, and industrial control systems where output stability, small size, and fast enable/disable behavior are essential.
FAQ
What is the maximum input voltage rating for the NCP4688DMU25TCG?
The NCP4688DMU25TCG has an absolute maximum input voltage rating of 6 V. Operation must remain within the recommended input range of 2.0 V to 5.25 V for guaranteed performance. Exceeding 6 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does the NCP4688DMU25TCG require external capacitors, and what values are recommended?
Yes, the NCP4688DMU25TCG requires both input and output ceramic decoupling capacitors. The datasheet specifies 1.0 µF for CIN (between VIN and GND) and 1.0 µF for COUT (between VOUT and GND), placed as close as possible to their respective pins. Lower-ESR ceramics improve transient response and stability.
How does the auto-discharge feature work in the NCP4688DMU25TCG?
When the CE pin is driven low, the NCP4688DMU25TCG activates an internal NMOS transistor (RDS(ON) = 60 Ω) between VOUT and GND. This provides a controlled discharge path for the output capacitor, reducing VOUT to near-zero faster than passive RC decay - critical for safe power sequencing in multi-rail systems.
Is the NCP4688DMU25TCG pin-compatible with other variants in the NCP4688 family?
Yes - all NCP4688 DFN-packaged variants (e.g., NCP4688DMU12TCG, NCP4688DMU33TCG) share identical UDFN-4 pinout and footprint. Only the marked output voltage differs; the CE, VIN, GND, and VOUT terminals are functionally and physically identical across the series.
What is the thermal resistance (RJA) of the NCP4688DMU25TCG in its DFN package?
The NCP4688DMU25TCG in the UDFN-4 (1.0×1.0 mm) package has a typical junction-to-air thermal resistance (RJA) of 250°C/W, as specified in Table 3 of the datasheet. Actual thermal performance depends on PCB copper area, layer stack-up, and airflow; use of the exposed pad improves heat dissipation.
NCP4688DMU25TCG 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.31V @ 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)
NCP4688DMU25TCG FAQ
1.How can I place an order for NCP4688DMU25TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4688DMU25TCG 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 NCP4688DMU25TCG reliable?
The price and inventory of NCP4688DMU25TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4688DMU25TCG is usually 5 days.
3.What payment methods are accepted for NCP4688DMU25TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4688DMU25TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4688DMU25TCG?
NCP4688DMU25TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4688DMU25TCG 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 NCP4688DMU25TCG?
For technical support, including NCP4688DMU25TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4688DMU25TCG requirements.
6.How does Aetrix verify that NCP4688DMU25TCG is sourced from the original manufacturer or authorized distributors?
All NCP4688DMU25TCG 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 NCP4688DMU25TCG meets industry standards.
7.What is the process for return or replacement of NCP4688DMU25TCG?
All NCP4688DMU25TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4688DMU25TCG, 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 NCP4688DMU25TCG part is unused and in its original packaging.
Return procedure for NCP4688DMU25TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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