AEC-Q100 certified LDO40L
140mV dropout voltage value at maximum load
DC power supply for home automation applications

STMicroelectronics has released the LDO40L, a 400mA LDO (Low-Dropout) linear regulator.
The new product provides quiet and efficient power to always-on automotive modules and noise-sensitive loads.

The LDO40L, which has obtained AEC-Q100 certification, has a standby current of 45µA and reduces the burden on the vehicle battery caused by loads such as vehicle body and interior functions that operate when the engine is turned off. In addition, this product can be deactivated to provide an extremely low shutdown current of only 1µA.

The internal circuit operates at a low input voltage of 3.5V or less and has a very low dropout voltage of 36mV at a 100mA load, or a dropout voltage value of 140mV at a maximum load.

Through this, the LDO40L can maintain power supply to the load as input dips during cold cranking.

The new LDO40L not only powers automotive body control modules, instruments, clusters, and LED lighting, but also ensures a stable, high-quality DC power supply for industrial control and building or home automation applications.

The output noise is only 20μV, the PSRR (Power Supply Rejection Ratio) is 70dB at 1kHz, and it is equipped with protection functions such as current limiting and thermal shutdown.

The LDO40L product allows for the selection of fixed output voltages of 3.0V, 3.3V, 5.0V, or 8.5V, and is regulated within ±3% of line, load, and temperature variations. The application circuit can be constructed using only two capacitors.

An adjustable-output version is also available, so designers can use an external resistor divider to set the output voltage as desired down to a minimum of 2.5V.

All versions are available in a 3mm x 3mm DFN6 package with wettable flanks. This package is smaller than the DPAK outline of typical competing devices, yet maintains high thermal performance and reliability relative to the heatsink size.