onsemi NCP717CMX300TCG

Overview

NCP717CMX300TCG from onsemi is a 300 mA, fixed 3.0 V output low-dropout (LDO) regulator with 25 µA typical quiescent current, 22 µV_RMS output noise (100 Hz–100 kHz), and 175 mV typical dropout at 300 mA. It features active output discharge (120 Ω), thermal shutdown, current limiting, and stable operation with a 1 µF ceramic output capacitor - designed for noise-sensitive, space-constrained portable electronics.

For engineers reviewing the NCP717CMX300TCG datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low IQ in battery-off states, sub-200 mV dropout at full load, ±2% output accuracy over temperature/load/line, and compatibility with minimal 1 µF X7R/X5R ceramic capacitors without ESR requirements.

Technical Context

The NCP717CMX300TCG employs a PMOS pass transistor architecture enabling reverse-current blocking and low dropout. Its adaptive quiescent current circuitry dynamically reduces ground current to 25 µA at no-load while maintaining regulation, critical for long battery life in always-on subsystems.

It integrates an enable-controlled active discharge path (120 Ω) that pulls VOUT to GND when EN < 0.4 V, preventing floating outputs in power sequencing. Protection includes foldback current limiting (379 mA typ.), thermal shutdown at 160°C (140°C hysteresis), and 70 dB PSRR at 1 kHz - optimized for RF and analog supply domains.

Key Specifications

Pinout & Package

Package: XDFN-4 (1.0 mm × 1.0 mm, 0.65 mm pitch), exposed pad (EPAD) for thermal dissipation - compatible with high-density PCB layouts and automated reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B302MR-G and RT9080A-30PU5, the NCP717CMX300TCG uniquely combines 120 Ω active discharge, 70 dB PSRR, and guaranteed 1 µF ceramic stability - making it optimal for compact, noise-critical, multi-rail portable systems requiring robust power sequencing.

Availability

NCP717CMX300TCG is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth Low Energy modules, and portable medical diagnostics requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NCP717CMX300TCG 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 part of onsemi's precision analog portfolio, engineered specifically for ultra-low-power, noise-sensitive portable electronics - emphasizing quiescent current optimization, small-footprint packaging, and integrated protection for battery-constrained designs.

FAQ

What is the maximum input voltage rating for the NCP717CMX300TCG?

The NCP717CMX300TCG has an absolute maximum input voltage rating of 6 V. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input range is 1.8 V to 5.5 V - sufficient to support single-cell Li-ion (2.8–4.2 V) and dual-cell alkaline (2.4–3.6 V) sources while maintaining 175 mV dropout headroom at full 300 mA load.

Does the NCP717CMX300TCG require an external resistor to enable active output discharge?

No, the NCP717CMX300TCG integrates active output discharge internally - specifically the "C" version (denoted in the suffix) provides a 120 Ω discharge path from VOUT to GND when EN is pulled below 0.4 V. No external components are needed; this feature is enabled automatically upon disable and is confirmed in the device's marking code and ordering table.

Can the NCP717CMX300TCG operate stably with a 100 nF output capacitor?

Yes - the NCP717CMX300TCG is specified to remain stable with a minimum effective output capacitance of 100 nF. However, the datasheet recommends ≥1 µF for adequate phase margin across temperature, voltage, and load variations. Using 100 nF may reduce transient response and PSRR at higher frequencies, so 1 µF ceramic (X5R/X7R) is preferred for production designs targeting robustness.

What is the typical enable pin input current for the NCP717CMX300TCG?

The typical enable pin input current for the NCP717CMX300TCG is 180 nA at 5.5 V, with a maximum of 500 nA over temperature. This ultra-low leakage allows direct drive from GPIOs of ultra-low-power MCUs without burdening the source, and the internal pull-down ensures default-disable behavior when EN is left floating.

How does thermal shutdown behave in the NCP717CMX300TCG during sustained overload?

The NCP717CMX300TCG triggers thermal shutdown at a typical junction temperature of 160°C and remains latched off until the die cools to approximately 140°C (20°C hysteresis). During sustained overload, this cycle repeats autonomously - protecting against catastrophic failure. The XDFN-4 package's R_JA of 250°C/W means adequate copper area under the EPAD is essential to sustain >100 mW dissipation without tripping.