Onsemi NCV301LSN45T1G: A 45V, 150mA Low-Dropout Voltage Regulator for Automotive and Industrial Applications

In the demanding worlds of automotive electronics and industrial control systems, stable and reliable voltage regulation is non-negotiable. These environments are characterized by wide voltage swings, extreme temperatures, and substantial electrical noise, which can easily disrupt sensitive circuitry. The Onsemi NCV301LSN45T1G is a low-dropout (LDO) voltage regulator engineered specifically to meet these rigorous challenges, providing a robust power management solution.

This device is a 45V, 150mA low-dropout linear regulator capable of withstanding high input voltages commonly found in automotive load-dump scenarios or 24V industrial bus systems. Its ability to maintain regulation with a very small voltage differential between input and output—the dropout voltage—is a key advantage. This high input voltage capability, combined with a low dropout, ensures efficient operation even when the input voltage is only marginally higher than the regulated output, conserving power and reducing heat dissipation.

A standout feature of the NCV301LSN45T1G is its extremely low quiescent current, typically just 30 µA. This makes it exceptionally suitable for always-on applications such as automotive infotainment systems, instrument clusters, and body control modules, where minimizing battery drain when the vehicle is off is critical. Furthermore, the regulator incorporates vital protection mechanisms, including current limiting and thermal shutdown, which safeguard both the IC and the downstream components from damage under fault conditions.

Housed in a space-saving TSOP-5 package, the device offers a compact footprint for densely populated PCBs. Its fixed 5V output (with other voltages available in the series) provides a stable supply for microcontrollers, sensors, and CAN transceivers. The component is also AEC-Q100 qualified, guaranteeing its performance and reliability for automotive applications.

ICGOOODFIND: The Onsemi NCV301LSN45T1G is a high-performance LDO regulator that excels in harsh environments. Its combination of a high 45V input rating, low quiescent current, and integrated protections makes it an ideal, reliable choice for powering critical systems in automotive and industrial designs.

Keywords: Low-Dropout (LDO) Regulator, Automotive Grade (AEC-Q100), Low Quiescent Current, 45V Input Voltage, Thermal Shutdown Protection.