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onsemi NCP717CMX185TCG
- Part No.:
- NCP717CMX185TCG
- Manufacturer:
- onsemi
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
NCP717CMX185TCG.pdf
- Description:
- IC REG LINEAR 1.85V 300MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
NCP717CMX185TCG from onsemi is a 300 mA, fixed 1.85 V output low-dropout (LDO) regulator in a 1.0 × 1.0 mm XDFN-4 package, featuring 25 µA typical quiescent current, 22 µVRMS output noise (100 Hz–100 kHz), and 175 mV typical dropout at 300 mA - optimized for battery-powered portable electronics requiring ultra-low power and high noise immunity.
For engineers reviewing the NCP717CMX185TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its active output discharge function (120 Ω), ±2% output accuracy over load/line/temperature, EN pin logic control with 0.4 V/0.9 V thresholds, and stability with only 1 µF ceramic output capacitor.
Technical Context
The NCP717CMX185TCG implements a PMOS pass transistor architecture with adaptive quiescent current adjustment to maintain 25 µA IQ at no-load while supporting full 300 mA output. Its internal bandgap reference and error amplifier deliver ±2% output voltage accuracy across −40°C to +125°C junction temperature.
It integrates thermal shutdown (160°C trip, 20°C hysteresis), current limit (~379 mA), and an active discharge transistor (120 Ω pull-down to GND when EN < 0.4 V). The EN pin includes 180 nA internal pull-down and 56 mV hysteresis to prevent noise-induced toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85 V - precisely trimmed during production; ±2% tolerance over full operating range ensures reliable biasing of 1.8 V I/O rails. |
| Max Output Current | 300 mA - supports moderate-power RF modules, sensors, or MCU cores without external heatsinking in XDFN-4 package. |
| Quiescent Current | 25 µA typ. at no-load - enables multi-year battery life in always-on wearable or IoT sensor nodes. |
| Dropout Voltage | 175 mV typ. at 300 mA - allows operation from single-cell Li-ion (3.0 V min) down to ~2.0 V input while maintaining regulation. |
| Output Noise | 22 µVRMS (100 Hz–100 kHz) - suitable for powering noise-sensitive analog circuits like ADCs, RF transceivers, or precision references. |
| PSRR | 70 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| EN Threshold | 0.4 V (low) / 0.9 V (high) - compatible with standard GPIO logic levels; internal 180 nA pull-down ensures default-off state. |
| Active Discharge | 120 Ω (C-version) - rapidly discharges output capacitance upon shutdown, preventing floating voltages or latch-up in downstream circuitry. |
Pinout & Package
Package: XDFN-4 (1.0 × 1.0 mm, 0.65 mm pitch), Case 711AJ, exposed pad (EPAD) connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Delivers stable 1.85 V; requires ≥1 µF ceramic capacitor to GND for stability; trace resistance must be minimized to preserve load regulation. |
| 2 - GND | Power ground | Reference node for all internal circuitry; EPAD must be soldered to large PCB ground plane for thermal dissipation and noise reduction. |
| 3 - EN | Enable control input | Logic-high (>0.9 V) enables regulation; logic-low (<0.4 V) disables output and activates 120 Ω discharge path to GND. |
| 4 - IN | Input supply | Accepts 1.8–5.5 V; requires ≥1 µF ceramic capacitor close to pin to suppress input ripple and support transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 25 µA typ. at no-load enables >10-year battery life in coin-cell-powered devices. |
| Low-noise regulation | 22 µVRMS output noise ensures clean power for RF front-ends and precision analog signal chains. |
| Active output discharge | 120 Ω internal discharge path pulls OUT to GND within microseconds after EN deactivation, preventing back-powering. |
| Stability with minimal capacitance | Guaranteed stable with 1 µF ceramic COUT; eliminates need for costly or space-consuming tantalum capacitors. |
| Robust protection suite | Includes thermal shutdown (160°C), current limiting (~379 mA), and short-circuit immunity with unlimited duration. |
| Wide input voltage range | 1.8–5.5 V operation supports direct connection to single-cell Li-ion, Li-poly, or multi-cell alkaline supplies. |
Applications
| Wearable Health Monitor | Bluetooth LE Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing powered by CR2032 coin cell with multi-year runtime requirement. IC Role / Device Role / Timing Role: Primary 1.85 V supply for ultra-low-power MCU and analog front-end; regulates voltage during deep-sleep and active measurement cycles. Use Value: 25 µA quiescent current extends battery life beyond 5 years; 22 µVRMS noise prevents interference in microvolt-level biopotential signals. | Use Scenario: Compact environmental sensor (temp/humidity/pressure) transmitting data via Bluetooth Low Energy every 2 seconds. IC Role / Device Role / Timing Role: Stable 1.85 V rail for BLE SoC's digital core and RF transceiver; EN pin synchronized with transmit bursts to minimize idle current. Use Value: Active discharge (120 Ω) clears output capacitance between transmissions, eliminating voltage hold-up that could disrupt BLE radio startup timing. |
| Portable Medical Glucose Meter | Industrial Handheld Scanner |
Use Scenario: Battery-operated glucose meter requiring clinical-grade accuracy and FDA-compliant reliability. IC Role / Device Role / Timing Role: Precision 1.85 V supply for ADC reference and op-amp signal conditioning circuitry; maintains ±2% output accuracy across −20°C to +60°C ambient. Use Value: ±2% output accuracy over temperature/load/line ensures consistent ADC conversion results; thermal shutdown prevents fault propagation during accidental overvoltage events. | Use Scenario: Rugged handheld barcode scanner using Li-ion battery and demanding fast wake-from-sleep response. IC Role / Device Role / Timing Role: Main 1.85 V supply for imaging sensor and decode processor; EN pin controlled by microcontroller to power cycle sensor subsystem. Use Value: 175 mV dropout enables operation down to 2.0 V battery voltage, maximizing usable capacity; 70 dB PSRR rejects noise from motor drivers and display backlight switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B185MR-G | 200 mA max output, 1.0 µA IQ, no active discharge, SOT-25 package (2.9 × 2.8 mm) | Lacks active discharge and higher current capability; better suited for ultra-low-IQ standby rails, not main system rails. | Select if lowest possible quiescent current is critical and 300 mA output is unnecessary. |
| Micrel MIC5205-1.85YM5-TR | 150 mA max output, 80 µA IQ, no active discharge, SOT-23-5 package | Lower current rating and higher IQ reduce suitability for BLE SoCs or sensor fusion processors requiring burst current. | Choose only for legacy designs where SOT-23 footprint is mandatory and 150 mA suffices. |
Compared with XC6210B185MR-G and MIC5205-1.85YM5-TR, the NCP717CMX185TCG uniquely combines 300 mA output, 25 µA IQ, and 120 Ω active discharge in a 1.0 × 1.0 mm footprint - enabling smaller, longer-life, and more robust portable systems without layout compromises.
Availability
NCP717CMX185TCG is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, portable medical devices, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for NCP717CMX185TCG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP717 series is designed specifically for space-constrained, battery-powered portable electronics requiring ultra-low quiescent current, low noise, and robust protection - targeting smartphones, wearables, and medical sensors.
FAQ
What is the output voltage tolerance of the NCP717CMX185TCG over temperature and load?
The NCP717CMX185TCG maintains ±2% output voltage accuracy across −40°C to +125°C junction temperature, 0–300 mA load, and input voltage range (VOUT + 0.5 V or 2.3 V, whichever is greater, up to 5.5 V). This is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" with test conditions explicitly covering full operating ranges. The NCP717CMX185TCG achieves this via laser-trimmed bandgap and feedback network calibration during production.
Does the NCP717CMX185TCG require an external capacitor on the EN pin for noise immunity?
No, the NCP717CMX185TCG does not require an external capacitor on the EN pin. It incorporates built-in 56 mV hysteresis and deglitch timing within the enable logic block to reject noise transients. The internal 180 nA pull-down current source also ensures a defined low state when EN is left floating. External filtering is unnecessary unless the application operates in extreme EMI environments exceeding the device's specified noise immunity.
What is the maximum allowable input voltage for the NCP717CMX185TCG?
The absolute maximum input voltage for the NCP717CMX185TCG is 6 V, as stated in the Absolute Maximum Ratings table. However, the recommended operating input voltage range is 1.8 V to 5.5 V. Operation above 5.5 V risks permanent damage even for brief durations, and the device is not characterized or guaranteed for functionality beyond 5.5 V. The NCP717CMX185TCG must be used within this 1.8–5.5 V window for reliable performance.
Can the NCP717CMX185TCG be used without an input capacitor (CIN)?
No, the NCP717CMX185TCG requires a minimum 1 µF ceramic capacitor (X5R or X7R) connected close to the IN pin, as specified in the Applications Information section. Omitting CIN risks instability, poor transient response, and potential oscillation due to parasitic inductance in the input trace. Larger values may be needed for applications with fast, high-amplitude load transients. The NCP717CMX185TCG is not characterized for operation without CIN.
How does the active output discharge function work in the NCP717CMX185TCG?
When the EN pin voltage falls below 0.4 V, the NCP717CMX185TCG disables the main pass transistor and simultaneously turns on an internal NMOS discharge switch connecting OUT to GND through a 120 Ω resistor. This actively pulls the output voltage to ground within microseconds, preventing residual charge from interfering with downstream logic states or causing back-powering. This behavior is exclusive to the "C" version (e.g., NCP717CMX185TCG) and is confirmed in the PIN FUNCTION DESCRIPTION and APPLICATIONS INFORMATION sections.
NCP717CMX185TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 35 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-XDFN (1x1)
NCP717CMX185TCG FAQ
1.How can I place an order for NCP717CMX185TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP717CMX185TCG 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 NCP717CMX185TCG reliable?
The price and inventory of NCP717CMX185TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP717CMX185TCG is usually 5 days.
3.What payment methods are accepted for NCP717CMX185TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP717CMX185TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP717CMX185TCG?
NCP717CMX185TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP717CMX185TCG 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 NCP717CMX185TCG?
For technical support, including NCP717CMX185TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP717CMX185TCG requirements.
6.How does Aetrix verify that NCP717CMX185TCG is sourced from the original manufacturer or authorized distributors?
All NCP717CMX185TCG 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 NCP717CMX185TCG meets industry standards.
7.What is the process for return or replacement of NCP717CMX185TCG?
All NCP717CMX185TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP717CMX185TCG, 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 NCP717CMX185TCG part is unused and in its original packaging.
Return procedure for NCP717CMX185TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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