onsemi NCP717CMX330TCG

Overview

NCP717CMX330TCG from onsemi is a 300 mA, fixed 3.3 V low-dropout (LDO) regulator with ultra-low quiescent current (25 µA typ. at no-load), 22 µV_RMS output noise (100 Hz–100 kHz), and 155 mV typical dropout at 300 mA. It features active output discharge (120 Ω), thermal shutdown, current limiting, and stable operation with only 1 µF ceramic output capacitor - optimized for space-constrained, battery-powered portable electronics.

For engineers reviewing the NCP717CMX330TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3 V fixed output, XDFN4 1.0×1.0 mm package, EN-controlled enable/disable with hysteresis, ±2% output accuracy over load/line/temperature, and suitability for noise-sensitive RF and medical subsystems requiring low IQ and high PSRR.

Technical Context

The NCP717CMX330TCG employs a PMOS pass transistor architecture enabling reverse-current blocking and low dropout across its 1.8–5.5 V input range. Its adaptive ground current circuitry dynamically reduces IQ under light/no-load conditions while maintaining regulation stability.

It integrates an internal bandgap reference, precision error amplifier, current-limit protection, thermal shutdown (160°C trip, 20°C hysteresis), and an active discharge switch (120 Ω) activated when EN < 0.4 V - distinguishing it from non-discharge variants (e.g., 'A' and 'B' suffixes) and enabling rapid VOUT ramp-down in power sequencing.

Key Specifications

Pinout & Package

XDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed pad (EPAD) thermally connected to GND. Compact footprint ideal for ultra-thin mobile PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-3302E/TT and XC6210B332MR-G, the NCP717CMX330TCG uniquely combines 300 mA drive, 22 µV_RMS noise, and 120 Ω active discharge in a 1.0×1.0 mm XDFN4 package - making it optimal for compact, sequenced, noise-critical portable systems where all three attributes are simultaneously required.

Availability

NCP717CMX330TCG is available at Aetrix Electronics and suitable for smartphone power management, wireless medical sensors, industrial IoT gateways, and portable diagnostic devices requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP717CMX330TCG 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 NCP717 series is designed for ultra-low-power, noise-sensitive portable applications - delivering high-performance LDO regulation in minimal footprint for battery-operated devices demanding extended runtime and signal integrity.

FAQ

What is the output voltage tolerance of the NCP717CMX330TCG over temperature and load?

The NCP717CMX330TCG maintains ±2% output voltage accuracy across −40°C to +125°C junction temperature, full 0–300 mA load range, and input voltage from V_OUT(nom)+0.5 V to 5.5 V. This is verified per Electrical Characteristics table on page 3 of the datasheet, ensuring reliable 3.3 V rail delivery in automotive cabin and industrial environments where thermal stress is significant.

Does the NCP717CMX330TCG require an external discharge resistor?

No, the NCP717CMX330TCG does not require an external discharge resistor because it integrates an active output discharge FET with 120 Ω on-resistance. When EN is pulled below 0.4 V, this internal path pulls VOUT to GND, discharging a 1 µF capacitor in approximately 330 µs - eliminating BOM cost and board space otherwise needed for discrete discharge circuits.

What is the minimum input voltage required for the NCP717CMX330TCG to maintain regulation at 300 mA?

The NCP717CMX330TCG requires a minimum input voltage of 3.455 V to maintain 3.3 V regulation at 300 mA, based on its typical 155 mV dropout voltage (V_DO) at that load. At worst-case 230 mV dropout (max spec), VIN must be ≥3.53 V. This enables compatibility with single-cell Li-ion batteries down to ~3.5 V under heavy load.

Can the NCP717CMX330TCG operate with a 100 nF output capacitor?

Yes, the NCP717CMX330TCG remains stable with a minimum 100 nF ceramic output capacitor, though the datasheet recommends ≥1 µF for optimal transient response and PSRR. The 100 nF lower bound accounts for capacitance loss due to DC bias and temperature; using 1 µF provides safety margin and meets typical design guidelines for load step performance.

How does the enable pin hysteresis improve system reliability in noisy environments?

The NCP717CMX330TCG's enable pin incorporates 56 mV of built-in hysteresis between turn-on (0.9 V) and turn-off (0.4 V) thresholds, plus deglitch timing. This prevents oscillatory on/off behavior caused by noise or slow-rising EN signals - ensuring clean, monotonic power-up and power-down sequences essential for microcontroller reset integrity and data retention in portable systems.