https://www.analog.com/jp/resources/design-notes/extending-the-supply-voltage-range-of-a-4decade--300ua-to-3a-resistorless-currentsensing-solution.html
Extending the Supply Voltage Range of a 4-Decade, 300uA to 3A Resistor-less Current-Sensing...
This introduces resistorless, greater than 4-decade dynamic range current-sensing solution.