onsemi NCP717BMX285TCG

Overview

NCP717BMX285TCG from onsemi is a 300 mA, fixed 2.85 V low-dropout linear regulator with ultra-low quiescent current (25 µA typ.), 22 µV_RMS output noise (100 Hz–100 kHz), and 175 mV typical dropout at full load - designed for noise-sensitive, space-constrained battery-powered systems such as GPS modules and portable medical sensors.

For engineers reviewing the NCP717BMX285TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its ±2% output accuracy over load/line/temperature, 70 dB PSRR at 1 kHz, EN-controlled shutdown (I_DIS = 0.01 µA typ.), stability with 1 µF ceramic output capacitor, and XDFN-4 1.0×1.0 mm package with exposed thermal pad.

Technical Context

The NCP717BMX285TCG employs a PMOS pass transistor architecture enabling reverse-current blocking and low dropout operation across its 1.8 V to 5.5 V input range. Its adaptive quiescent current circuitry dynamically reduces ground current under light/no-load conditions while maintaining regulation accuracy.

It integrates thermal shutdown (160°C trip, 20°C hysteresis), output current limiting (379 mA typ.), and EN logic with built-in 180 nA pull-down - but excludes active output discharge (confirmed by "B" suffix and ordering table). The device operates without external compensation and requires no minimum ESR on C_OUT.

Key Specifications

Pinout & Package

XDFN-4 1.0×1.0 mm package (Case 711AJ) with 0.65 mm pitch and exposed thermal pad (EPAD) requiring direct connection to PCB ground plane for thermal performance (R_JA = 250°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B285MR-G and MIC5219-2.85YM5-TR, the NCP717BMX285TCG delivers superior noise performance (22 vs. ≥40 µV_RMS), lower dropout (175 vs. ≥280 mV), and significantly lower quiescent current (25 vs. ≥35 µA), making it optimal for compact, battery-critical, noise-sensitive applications where EN control is required.

Availability

NCP717BMX285TCG is available at Aetrix Electronics and suitable for GPS receivers, portable medical sensors, Bluetooth LE asset tags, and industrial wireless transmitters requiring stable component supply with guaranteed long-term availability and Pb-free compliance.

Supply support for NCP717BMX285TCG 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, high-performance silicon solutions for automotive, industrial, cloud, and IoT applications.

The NCP717 series is engineered for ultra-low-power, noise-critical portable electronics - emphasizing minimal quiescent current, high PSRR, and small-footprint stability to extend battery life and simplify power design in space-constrained devices.

FAQ

What is the maximum input voltage rating for the NCP717BMX285TCG?

The NCP717BMX285TCG has an absolute maximum input voltage rating of 6 V. Operation above 5.5 V is not recommended per datasheet specifications, and sustained exposure beyond 6 V may cause permanent damage. For reliable operation, VIN should remain within 1.8 V to 5.5 V, with 3.35 V minimum required to maintain 2.85 V output at 300 mA load.

Does the NCP717BMX285TCG include active output discharge?

No, the NCP717BMX285TCG does not include active output discharge. The "B" suffix in the part number explicitly denotes the version without this feature. Unlike the "A" (1.2 kΩ) and "C" (120 Ω) variants, the NCP717BMX285TCG leaves the output floating when disabled via EN, preserving voltage on downstream capacitance.

What output capacitor value and type are required for stability with the NCP717BMX285TCG?

The NCP717BMX285TCG is stable with a minimum 1 µF ceramic capacitor (X5R or X7R dielectric) on the output. Tantalum capacitors are not recommended due to high ESR and temperature-dependent impedance. The maximum allowable ESR is 700 mΩ; no minimum ESR is required. A 0402 1 µF MLCC placed adjacent to the OUT and GND pins satisfies all stability requirements.

How does the enable pin (EN) behave during power-up and what is its leakage current?

The EN pin has an internal 180 nA pull-down current source, ensuring the NCP717BMX285TCG remains off if left unconnected. It asserts enable when voltage exceeds 0.9 V (typ.) and disables below 0.4 V (typ.), with 56 mV hysteresis to reject noise. EN input current is ≤500 nA at 5.5 V, minimizing loading on microcontroller GPIOs.

What thermal protection features are integrated into the NCP717BMX285TCG?

The NCP717BMX285TCG incorporates thermal shutdown that activates at 160°C (typ.) junction temperature and resets at 140°C (typ.) hysteresis. This protects against catastrophic failure during overload or poor heatsinking. The device's R_JA of 250°C/W assumes standard PCB layout with EPAD soldered to ground plane; exceeding 125°C junction temperature continuously degrades reliability.