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The following circuit diagram schemes a high efficiency step-up converter based on the L6920DA IC. When white LEDs are powered from a single or two cell batteries, you need a boost converter for boosting the voltage to drive the LEDs.
If you need to construct a simple DC/DC Converter which can deliver 5V at 100mA from 3V input or 12 V at 60 mA from a 5V input, you may consider the LT1109 IC series, we provide you with the datasheet and application circuit diagram.
If you need to design a Step-Up, Step-Down and Voltage-Inverting applications with a minimum number of external components, you may consider The MC34063A Inverting Switching Regulators Series since this device are specifically designed to be incorporated with those purposes. The circuit diagram below is one of MC34063A DC-to-DC Converter Control Circuit which perform Step–Up Converter schematic.
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