Patent ID: 8467520

Claim:
A method of generating a plurality of supply voltages for a plurality of subscriber line channels, comprising: a) generating a first target VBAT value for a first associated linefeed driver from a first VBAT control; b) generating a second target VBAT value for a second associated linefeed driver from a second VBAT control; c) generating a selected target VBAT value based at least in part on the first and second target VBAT values, wherein a magnitude of the selected target VBAT value is not less than any maximum of a magnitude of the first and second target VBAT values; and d) controlling a switching regulator to provide a first generated VBAT corresponding to the selected target VBAT value, wherein the switching regulator provides a second generated VBAT having a pre-determined proportional relationship (p) to the first generated VBAT.