Voltage control in integrated circuits include a first voltage divider coupled to receive a reference voltage and having an output providing an adjusted reference voltage; an operational amplifier having a first input coupled to receive the output of the first voltage divider, a second input coupled to receive a feedback voltage, and an output; a voltage generation circuit responsive to the output of the operational amplifier and having an output providing an output voltage; and a second voltage divider coupled to receive the output voltage and having an output providing the feedback voltage. The first voltage divider is responsive to first control signals to adjust a voltage level of the adjusted reference voltage. The second voltage divider is responsive to second control signals to adjust a voltage level of the feedback voltage.