Recently I stumbled across the MT9284 led driver IC. The datasheet shows it can be used for strings of 7 white leds. There is a suggestion in the graphs that the maximum led current is perhaps 20mA.
I also had some 1 watt white leds by Bridgelux, BXEN-65E-13H-9B-00-0-0. These are approximately 9V at 110ma.
Can the MT9284 drive one or more of these? Yes. I have tested to date one Bridgelux device at currents up to 80mA. The efficiency has varied from 83% to 92%, depending on led current.
Nice and bright! I'm going to update my collection of homebrew pocket torches. I find as I get older that the part markings are getting harder to read and a bright light source that can illuminate the part from different angles makes a big difference.
More soon.
73's
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