Using MA1576 charge pump to drive two sets of LED circuits

　This circuit is capable of driving two groups of four white LEDs at a total current of up to 480mA . For the white LED group in the flashing state, the current of each white LED is allowed to reach 100mA. Each group of white LEDs has independent current settings, pulse brightness adjustment and 2-wire brightness control. Using adaptive switching, the average efficiency can reach 83% during the entire discharge process of a single-cell lithium-ion battery. For digital cameras that use white LED flash , it is an ideal choice to use MAX1576 to form a white LED driver circuit. MAX1575 is another chip in this series, capable of driving two sets of white LEDs (four main screen white LEDs and two sub-screen white LEDs ) with a total output current of 120mA.