The LT3080, introduced in 2007, represented a new linear regulator architecture featuring a current source as a reference and a voltage follower for the output amplifier. This new architecture has a number of advantages, including easy regulator paralleling for increased output current and operation down to zero output voltage. Since the output amplifier always operates at unity gain without a resistor-setting divider, bandwidth and absolute regulation are constant across the output voltage range. Transient response is independent of output voltage and regulation can be specified in millivolts rather than as a percent of output.
This is a companion discussion topic for the original entry at https://eepower.com/power-converters/negative-regulator-lt3091-expands-family-current-reference-linear-regulators-analog