onsemi NCP718ASN250T1G: 250mA Low-Noise LDO Voltage Regulator for Precision Applications

In the realm of modern electronics, achieving clean and stable power is paramount, especially for noise-sensitive applications. The onsemi NCP718ASN250T1G stands out as a premier solution, engineered specifically to meet the stringent demands of precision analog and RF circuits. This 250mA low-dropout (LDO) voltage regulator combines ultra-low noise performance with high power supply rejection ratio (PSRR), making it an ideal choice for powering critical components where even minor voltage fluctuations can degrade performance.

A key highlight of the NCP718 is its exceptionally low output noise, typically measuring just 6.5µVrms over a 10Hz to 100kHz bandwidth. This is achieved through an innovative internal architecture that minimizes inherent noise generation, ensuring that sensitive loads such as high-resolution sensors, precision analog-to-digital converters (ADCs), voltage-controlled oscillators (VCOs), and audio amplifiers receive pristine power. Furthermore, the device boasts an impressive PSRR of 70dB at 1kHz, effectively rejecting ripple and noise from the input supply, which is crucial in systems powered by switching regulators or noisy sources.

The NCP718 supports a wide input voltage range from 2.5V to 5.5V, providing flexibility for both 3.3V and 5V bus-based systems. Its low dropout voltage—typically 130mV at 150mA load—enhances efficiency by allowing operation with very small headroom, preserving battery life in portable devices. The fixed 2.5V output variant (NCP718ASN250T1G) simplifies design while ensuring accuracy with a tight initial tolerance of ±0.8%.

Additional features include enable/disable control for power sequencing and sleep-mode management, and built-in protection circuits such as current limit and thermal shutdown to safeguard the IC and downstream components under fault conditions. Housed in a space-saving DFN-4 package, it is optimized for compact PCB layouts.

ICGOOODFIND: The onsemi NCP718ASN250T1G is a top-tier LDO regulator that delivers ultra-low noise and high PSRR, essential for precision applications where power integrity directly impacts system performance.

Keywords: Low-Noise LDO, High PSRR, Precision Voltage Regulation, 250mA Regulator, Ultra-Low Output Noise