Texas instruments low dropout voltage regulator positive texas instruments lm2940ct the texas instruments lm2940ct low dropout voltage regulator is characterized by low power loss while the conventional regulators need a differential input output voltage of approx 2 3vdc the lm2940 only needs 0 5 1vdc this means lower power dissipation and hence a lower temperature in operation leading to greater reliability the device is thermally protected short circuit proof and protected agains