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onsemi NCP4688DMU15TCG
- Part No.:
- NCP4688DMU15TCG
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
NCP4688DMU15TCG.pdf
- Description:
- IC REG LINEAR 1.5V 150MA 4UDFN
- Quantity:
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Inventory:8,439
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Product details
Overview
NCP4688DMU15TCG from onsemi is a 150 mA, low-noise CMOS LDO linear voltage regulator delivering 1.5 V output with ±1% accuracy across −40°C to +85°C, 10 µVRMS output noise, and 80 dB PSRR at 1 kHz - designed for powering sensitive RF modules and portable communication equipment requiring stable, clean bias.
For engineers reviewing the NCP4688DMU15TCG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (0.34 V typ. at 150 mA), auto-discharge NMOS (60 Ω), CE pin threshold (1.0 V min. "H" level), thermal resistance (250 °C/W in DFN1010), and compatibility with 1.0 µF ceramic input/output capacitors.
Technical Context
The NCP4688DMU15TCG integrates a precision bandgap reference, error amplifier, pass transistor, current-limit circuit, and dedicated auto-discharge NMOS between VOUT and GND activated during disable mode. Its CMOS architecture enables ultra-low quiescent current (75 µA typ. at VOUT ≤ 4.1 V) and fast enable/disable response.
It operates within 2.0 V to 5.25 V input range, supports 1.5 V fixed output via factory-trimmed internal feedback, and maintains regulation under load transients up to 150 mA with <±14 mV load regulation. The CE pin is active-high with internal pull-down (0.3–0.6 µA), ensuring fail-safe shutdown when floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±1% over −40°C to +85°C - ensures stable core/bias rail for RF ICs and microcontrollers without external resistors. |
| Max Output Current | 150 mA continuous - sufficient for powering single-chip radios, sensor interfaces, or low-power MCU peripherals. |
| Dropout Voltage | 0.34 V (typ.) at 150 mA - enables operation from 1.85 V input, supporting Li-ion single-cell or 2xAA battery systems. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - minimizes phase noise injection into VCOs and PLLs in RF front-ends. |
| PSRR | 80 dB @ 1 kHz, 75 dB @ 10 kHz - suppresses switching noise from DC/DC converters feeding the LDO input. |
| Quiescent Current | 75 µA (typ.) at VOUT ≤ 4.1 V - extends battery life in always-on sensor nodes and standby circuits. |
| Auto-Discharge | 60 Ω NMOS between VOUT–GND during disable - clears output capacitance in <1 ms, preventing residual voltage hold-up. |
Pinout & Package
Package: UDFN-4 (1.0 mm × 1.0 mm, 0.65 mm pitch), case 517BR, Pb-free, exposed pad (EP) - optimized for space-constrained RF modules and wearables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EP) | Exposed Pad | Thermal relief path; must be soldered to PCB ground plane for rated 250 °C/W RJA and reliability. |
| 2 | GND | Power ground reference for regulator control loop and output capacitor return. |
| 3 | CE | Active-high chip enable; internal 0.3–0.6 µA pull-down ensures default OFF state if unconnected. |
| 4 | VIN | Input supply connection; requires 1.0 µF ceramic decoupling placed adjacent to pin per layout guidelines. |
| 5 | VOUT | Regulated 1.5 V output; connects to 1.0 µF ceramic capacitor and load; auto-discharge NMOS sinks current when CE = L. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 10 µVRMS output noise enables direct powering of VCOs, ADC references, and RF synthesizers without additional filtering. |
| High PSRR at RF frequencies | 75 dB @ 10 kHz and 65 dB @ 100 kHz suppresses noise from high-frequency switchers and digital clocks coupled onto VIN. |
| Fast enable/disable with auto-discharge | CE-controlled turn-on/turn-off with integrated 60 Ω discharge path clears VOUT in <1 ms - critical for power sequencing in multi-rail systems. |
| Ultra-low quiescent current | 75 µA typical IQ at light loads extends runtime in battery-powered IoT endpoints and remote sensors. |
| Stable with 1.0 µF ceramic output cap | No ESR requirement simplifies BOM and layout; eliminates need for tantalum or polymer capacitors in compact designs. |
Applications
| RF Module Power Supply | Portable Audio Codec Bias |
|---|---|
|
Use Scenario: Powers 2.4 GHz BLE transceiver IC (e.g., nRF52832) in compact wireless earbud PCB where board area and EMI are constrained. IC Role / Device Role / Timing Role: Provides ultra-low-noise 1.5 V bias to RF synthesizer and LNA stages, minimizing reciprocal mixing and phase noise degradation. Use Value: 10 µVRMS noise and 80 dB PSRR prevent baseband interference from shared DC/DC converter, enabling >90 dB SNR in receive path. |
Use Scenario: Supplies analog core voltage to stereo audio codec (e.g., AK4430) in Bluetooth speaker with single Li-ion cell input. IC Role / Device Role / Timing Role: Delivers tightly regulated 1.5 V reference for DAC/ADC bias rails, rejecting ripple from buck converter feeding system logic. Use Value: ±1% accuracy and <±14 mV load regulation maintain THD+N <−95 dB across full 1–150 mA dynamic load range. |
| Industrial Sensor Node MCU Core | Automotive Infotainment Display Backlight Driver Bias |
|
Use Scenario: Powers ARM Cortex-M0+ MCU core in wired industrial temperature sensor node operating from 3.3 V bus with transient noise. IC Role / Device Role / Timing Role: Generates clean 1.5 V core rail isolated from noisy CAN/LIN bus power domains using high PSRR and low dropout. Use Value: 0.34 V dropout allows operation down to 1.85 V input, sustaining core voltage during brown-out events on 2.0 V–3.3 V supply rails. |
Use Scenario: Supplies gate bias to high-side LED driver FET in automotive LCD cluster backlight, requiring fast enable/disable sync with display controller. IC Role / Device Role / Timing Role: Provides 1.5 V logic-level enable signal with sub-millisecond auto-discharge to prevent ghost illumination after display off command. Use Value: Integrated 60 Ω NMOS discharges 10 µF output cap in <1 ms - meets AEC-Q100 Class 2 transient immunity requirements for display power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1502E/TT | 150 mA, 1.5 V fixed, 6 µA IQ, no auto-discharge, SOT-23 only | Lacks VOUT discharge path; unsuitable where rapid rail collapse is required | Select when ultra-low IQ dominates over discharge speed; verify layout supports SOT-23 thermal limits. |
| Torex XC6210B152MR-G | 150 mA, 1.5 V fixed, 25 µA IQ, 1.1 V min. VIN, no auto-discharge | Lower VIN min. enables single NiMH cell use but lacks discharge NMOS and RF-grade PSRR | Prefer for ultra-low-voltage battery systems; avoid in RF-sensitive designs needing >75 dB PSRR above 10 kHz. |
Compared with MCP1700T-1502E/TT and XC6210B152MR-G, the NCP4688DMU15TCG uniquely combines RF-optimized noise/PSRR performance, integrated auto-discharge, and DFN1010 footprint - making it the only option among the three qualified for space-constrained, noise-critical RF module applications.
Availability
NCP4688DMU15TCG is available at Aetrix Electronics and suitable for RF modules, portable audio codecs, industrial sensor nodes, and automotive display backlight controllers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for NCP4688DMU15TCG 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 focused on energy-efficient electronics, with leadership in power management, analog, sensing, and connectivity solutions.
The NCP4688DMU15TCG belongs to onsemi's low-noise LDO family engineered specifically for noise-sensitive analog and RF subsystems in portable, industrial, and automotive applications - emphasizing PSRR, output stability, and minimal board area.
FAQ
What is the maximum input voltage rating for the NCP4688DMU15TCG?
The NCP4688DMU15TCG has an absolute maximum input voltage of 6 V. Operation beyond this limit risks permanent damage. For reliable continuous use, the recommended input range is 2.0 V to 5.25 V - ensuring proper regulation and thermal safety across all load and temperature conditions specified in the datasheet.
Does the NCP4688DMU15TCG require an external resistor network to set output voltage?
No, the NCP4688DMU15TCG is a fixed-output LDO with factory-trimmed 1.5 V regulation. It contains no external feedback pins and does not support adjustable output configurations. The "15" in the part number explicitly denotes the 1.5 V nominal output, eliminating the need for external resistors or configuration components.
Can the CE pin of the NCP4688DMU15TCG be left floating in the circuit?
Yes, the CE pin of the NCP4688DMU15TCG can be left floating because it features an internal pull-down current source (0.3–0.6 µA). This ensures the device remains disabled by default. However, for deterministic behavior in noisy environments, connecting CE directly to VIN is recommended to guarantee reliable turn-on.
What is the purpose of the exposed pad (EP) on the NCP4688DMU15TCG DFN package?
The exposed pad (EP) on the NCP4688DMU15TCG serves as the primary thermal conduction path from the die to the PCB. It must be soldered to a solid copper ground plane to achieve the specified 250 °C/W junction-to-air thermal resistance. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown under 150 mA load.
Is the NCP4688DMU15TCG compatible with 1.0 µF ceramic capacitors on both input and output?
Yes, the NCP4688DMU15TCG is fully stable with 1.0 µF X5R/X7R ceramic capacitors on both input and output, as validated in the datasheet's application section and Figure 41. No minimum ESR requirement exists, simplifying design and reducing BOM cost versus traditional LDOs requiring tantalum or electrolytic capacitors.
NCP4688DMU15TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
NCP4688DMU15TCG FAQ
1.How can I place an order for NCP4688DMU15TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4688DMU15TCG 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 NCP4688DMU15TCG reliable?
The price and inventory of NCP4688DMU15TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4688DMU15TCG is usually 5 days.
3.What payment methods are accepted for NCP4688DMU15TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4688DMU15TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4688DMU15TCG?
NCP4688DMU15TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4688DMU15TCG 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 NCP4688DMU15TCG?
For technical support, including NCP4688DMU15TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4688DMU15TCG requirements.
6.How does Aetrix verify that NCP4688DMU15TCG is sourced from the original manufacturer or authorized distributors?
All NCP4688DMU15TCG 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 NCP4688DMU15TCG meets industry standards.
7.What is the process for return or replacement of NCP4688DMU15TCG?
All NCP4688DMU15TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4688DMU15TCG, 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 NCP4688DMU15TCG part is unused and in its original packaging.
Return procedure for NCP4688DMU15TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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