STMicroelectronics’ LDO40L is an automotive Low Drop-Out (LDO) regulator which supplies a maximum output current of 400mA.
Because it features a low quiescent current of 45μA, the LDO40L is suitable for applications that are permanently connected to a car’s battery.
This feature is especially important for electronic modules that remain in Active mode when the ignition is switched off.
The LDO40L’s low drop-out voltage, just 140mV when supplying the maximum 400mA load, also contributes to low system power consumption.
The LDO handles a maximum input voltage of 38V. ST supplies the LDO in various fixed output-voltage options: 3.0V, 3.3V, 5.0V and 8.5V. There is also an adjustable output version: the output voltage can be set at between 2.5V and 11V by connecting a resistor divider between the Adjust pin and the output. Output voltage tolerance is ±1% at 25°C.
LDO40L: Low drop-out voltage and 45μA quiescent current