STM low-dropout linear regulator suits always-on automotive modules

LDO40L 400mA low-dropout linear regulator from ST Microelectronics

The LDO40L 400mA low-dropout linear regulator from ST Microelectronics delivers quiet and efficient power for always-on automotive modules and noise-sensitive loads.

With 45µA quiescent current, the AEC-Q100 qualified part reduces the demand on vehicle batteries to run loads such as body and interior functions that are active when the ignition is off. In addition, the device can be disabled to achieve a shutdown current of 1µA.

The internal circuitry operates from an input voltage down to 3.5V and, combined with the low dropout voltage of 36mV at 100mA load or 140mV at full load, the device can maintain power to the load as the input dips during cold cranking.

In addition to powering automotive body-control modules, instruments and clusters, and LED lighting, the device also ensures stable, high-quality DC for industrial controls and building- or home-automation applications. Output noise is 20µV and power-supply rejection ratio 70dB at1kHz.

Protection features include current limit and thermal shutdown built-in.

The device variants give a choice of fixed 3.0, 3.3, 5.0 or 8.5V output voltage, regulated within ±3% including line, load and temperature variation. Two capacitors are needed to complete the application circuit. An adjustable-output version is also available, which allows designers to set a desired output voltage down to 2.5V using an external resistor divider.

All versions are housed in a 3 by 3mm DFN6 package with wettable flanks, which is smaller than the DPak outline yet maintains high thermal performance and reliability in relation to heatsink size.

The LDO40L series is in full production.


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