PROGRAMMABLE CURRENT SOURCE WITH OPTIMIZED COMPLIANCE REGION FOR EFFICIENT BACKLIGHTING IN PORTABLE APPLICATIONS

摘要

A programmable current source programmable current source circuit has DAC current source providing an incrementally programmable current levels. A programmable reference current source adjusts a compliance factor of the DAC current source. An input adjustment code indicating an output current amplitude is adjusted by a adjustment code modification circuit when the output current is less than the activation compliance level and generates a signal to set the reference current to a lower level to adjust the compliance factor of the DAC current source to a lower level to decrease power dissipation in the programmable current source at lower current levels.