onsemi NCP717CMX250TCG

Overview

NCP717CMX250TCG from onsemi is a 300 mA, fixed 2.5 V output low-dropout (LDO) regulator with ultra-low quiescent current (25 µA typ.), 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 only 1 µF ceramic output capacitance - optimized for battery-powered portable electronics requiring high PSRR (70 dB at 1 kHz) and tight ±2% output accuracy.

For engineers reviewing the NCP717CMX250TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its XDFN4 1.0×1.0 mm package, EN-controlled enable/disable with 0.4 V/0.9 V thresholds, adaptive ground current for ultra-low IQ, and verified stability with low-ESR ceramic capacitors in space-constrained, noise-sensitive designs.

Technical Context

The NCP717CMX250TCG employs a PMOS pass transistor architecture enabling reverse-current blocking and low dropout across its 1.8–5.5 V input range. Its internal bandgap reference and error amplifier deliver ±2% output accuracy over load, line, and temperature (−40°C to +125°C), while dynamic quiescent current adjustment maintains 25 µA typ. IQ at no-load and scales with output current.

It integrates an active output discharge circuit (120 Ω pull-down) activated during shutdown, EN logic with 56 mV hysteresis and deglitching, and protection features including thermal shutdown (160°C trip, 20°C hysteresis) and current limit (379 mA typ.). PSRR is optimized via feedback loop design and benefits from proper C_OUT selection and PCB layout.

Key Specifications

Pinout & Package

XDFN4 1.0×1.0 mm package with exposed thermal pad (EPAD); compact footprint ideal for ultra-thin mobile devices and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0525PDBVR and MCP1700T-2502E/MB, the NCP717CMX250TCG uniquely combines 300 mA drive, 25 µA IQ, 120 Ω active discharge, and XDFN4 miniaturization - making it optimal for next-gen portable devices demanding both efficiency and controlled power sequencing.

Availability

NCP717CMX250TCG is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, portable medical pulse oximeters, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP717CMX250TCG 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, delivering silicon solutions for automotive, industrial, cloud, and intelligent edge applications.

The NCP717 series is designed specifically for ultra-low-power, noise-sensitive portable electronics - emphasizing minimal quiescent current, small footprint, and robust protection in battery-constrained environments.

FAQ

What is the output voltage tolerance of the NCP717CMX250TCG over temperature and load?

The NCP717CMX250TCG delivers ±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 guaranteed by onsemi's production testing and design validation, ensuring stable 2.5 V operation in demanding thermal and loading conditions encountered in portable electronics.

Does the NCP717CMX250TCG require an external resistor network to set the output voltage?

No, the NCP717CMX250TCG is a fixed-output LDO with internally trimmed 2.5 V regulation. It does not require external feedback resistors, simplifying layout, reducing BOM count, and eliminating resistor tolerance errors that could degrade output accuracy - a key advantage over adjustable LDOs in space-constrained designs.

How does the active output discharge function work in the NCP717CMX250TCG?

When the EN pin is driven below 0.4 V, the NCP717CMX250TCG disables the pass transistor and activates an internal 120 Ω pull-down between OUT and GND. This actively discharges the output capacitor, preventing residual voltage from powering downstream circuitry or causing undefined states during system reset - a critical feature for reliable power sequencing in modern portable devices.

What is the minimum output capacitance required for stability with the NCP717CMX250TCG?

The NCP717CMX250TCG is stable with a minimum 1.0 µF ceramic output capacitor (X5R/X7R), and remains stable down to 100 nF under typical conditions. The device imposes no minimum ESR requirement but specifies a maximum ESR of 700 mΩ - confirming compatibility with low-ESR MLCCs and eliminating need for tantalum or aluminum electrolytic capacitors.

Can the NCP717CMX250TCG operate from a single-cell Li-ion battery throughout its full discharge curve?

Yes - with a 175 mV typical dropout at 300 mA and 2.5 V output, the NCP717CMX250TCG regulates down to 2.675 V input. Since a single-cell Li-ion battery discharges from ~4.2 V to ~2.8 V, the NCP717CMX250TCG maintains regulation across >95% of the battery's usable voltage range, maximizing runtime in portable applications.