0.9V Boost Driver for White LEDs
This tiny circuit drives white, blue or UV LEDs from a single battery cell with a constant output current and is simple and easy to use. Boost driver with stabilised LED current over Wide input voltage range Minimum input voltage 0.9V - allows use of single alkaline or NiMH cells with all LED types PR4401, PR4402 for up to 1.9V, PR4406 up to 5V supply SOT-23 package, lowest total cost Requires only a small inductor as external Component at low LED currents Simple circuit for high LED currents High efficiency of 80% and more Battery deep discharge protection Compatible with all LED types LED current set by inductanceMiniture pocket torches Indicator lights for low-voltage circuits LCD backlighting for watches and clocks toys, models making Medical lights