Circuit to Control the Effect of Dielectric Absorption in Dynamic Voltage Scaling Low Dropout Regulator

A method for compensating for the dielectric absorption current from the recharging of the output load capacitor of a low dropout voltage regulator comprising the steps of:

• requesting the low voltage regulator to decrease its output voltage;
• enabling an internal load current source to decrease the output voltage of the low dropout voltage regulator by adjusting the charge of the output load capacitor;
• ramping down an output voltage level of the low dropout voltage regulator until it brought to a lower voltage level;
• disabling the internal load voltage source is disabled:
• applying a profile compensation current after the low dropout voltage regulator is disabled to counteract the dielectric absorption current of the recharging output load capacitor to prevent the low dropout voltage regulator from becoming unregulated.

An apparatus for compensating for the dielectric absorption current from the recharging of the output load capacitor of a low dropout voltage regulator comprising:

• means for requesting the low voltage regulator to decrease its output voltage;
• means for enabling an internal load current source to decrease the output voltage of the low dropout voltage regulator by adjusting the charge of the output load capacitor;
• means for ramping down an output voltage level of the low dropout voltage regulator until it brought to a to a lower voltage level;
• means for disabling the internal load voltage source is disabled;
• and
• means for applying a profile compensation current after the low dropout voltage regulator is disabled to counteract the dielectric absorption current of the recharging output load capacitor to prevent the low dropout voltage regulator from becoming unregulated.