STMicroelectronics’ Energy-Saving Low-Noise LDO Regulator Runs Automotive Modules and Smart Automation

December 7, 2018 Laura Dolan

Geneva - STMicroelectronics’ LDO40L provides quiet and efficient power for always-on automotive modules and noise-sensitive loads.

LDO40L is AEC-Q100 qualified with 45µA quiescent current and diminishes the need for vehicle batteries to run loads while the ignition is off. The device can also be deactivated to achieve a very-low shutdown current of only 1µA.

The LDO40L is able to maintain power to the load as cold cranking causes the input to drop with a 3.5V input voltage combined with the extremely low dropout voltage of 36mV at 100mA load, or 140mV at full load.

The LDO40L also guarantees consistent, high-quality DC for industrial controls and building- or home-automation applications while powering automotive body-control modules, instruments and clusters, and LED lighting. Output noise is a mere 20µV, power-supply rejection ratio (PSRR) 70dB @1kHz and has built-in protection features including current limit and thermal shutdown.

The device variants range from fixed 3.0V, 3.3V, 5.0V or 8.5V output voltage, regulated at give or take 3 percent including line, load and temperature variation.

For more information, please visit

Previous Article
Pixon Imaging’s ExDRA helps Cellphone Cameras Take Better Pictures in the Dark

Pixon Imaging's new Extended Dynamic Range Architecture (ExDRA) is a groundbreaking software method that si...

Next Article
Renishaw uses Proven LDRA Tool Suite for Functionally Safe Positioning

According to LDRA, Renishaw has certified its RESOLUTE FS optical encoder system to meet level SIL 2 in acc...