Programmable board mounted voltage regulators

A programmable resistive network coupled between the regulated output voltage and an error amplifier of a feedback circuit for adjusting the operating voltage for desired performance of a replaceable device. The replaceable device is preferably connected using a ZIF socket to facilitate removal and replacement. In a first embodiment, the resistive network includes a resistor pack having a resistive ratio corresponding to a replaceable device. In a second embodiment, the resistive network includes a mounted programmable potentiometer which is programmed to a new value when the device is replaced or upgraded. In a third embodiment, the resistive network comprises laser trimmed silicon resistors mounted on the same silicon die as the replaceable device, where the silicon resistors are laser trimmed when the device is fabricated. A junction of the silicon device is provided through an external pin to the feedback error amplifier. Again, the resistive ratio of the silicon resistors corresponds to the desired operating voltage of the device.