1.5V battery powers white-LED driver

  
Although white LEDs are common in a variety of lighting applications, their 3 to 4V forward-voltage drop makes low-voltage applications challenging. Charge pumps and other ICs are available for driving white LEDs, but they generally don`t work with the low supply voltage of 1.5V in single-cell-battery applications. The low-voltage circuit of Figure 1 provides a current-regulated output suitable for driving white LEDs. The boost converter, IC1, can supply load currents to 62 mA with input voltages as low as 1.2V, making it suitable for use with a 1.5V, single-cell battery.
1.5V battery powers white-LED driver - schematic




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