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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.

  • ±3% guaranteed output-voltage accuracy
  • 70dB power-supply rejection ratio at 1kHz
  • 20μVrms output noise at 10Hz to 100kHz
  • Current limitation
  • Thermal shut-down protection
  • Operating-temperature range: -40°C to 125°C
  • AEC-Q100 qualified to Grade 1
  • Automotive applications
  • Body control modules
  • Instruments and clusters
  • Automotive LED lighting
  • Low-power industrial and consumer devices

LDO40L: Low drop-out voltage and 45μA quiescent current


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