Thursday, July 22, 2010
Compact Switching Step-Down Converter By MAX639
This is designed for a fixed output voltage of +5V, with an input voltage ranging between +5.5 and +11.5V. Although this IC is primarily designed for a fixed output voltage, the output voltage can be tailored using a simple feedback network. With the given component values, resistors R3 and R4 determine the output voltage, with R3 = R4 [(Vout / 1.28) – 1] The value of R4 may lie between 10kΩ and 10MΩ, but a value of 100 kΩ is a good choice for most applications. The maximum output current is 100mA. If desired, a different type of Schottky diode with similar specifications can be used in place of D1 (a 1N5817). Inductor L1 must be suitable for a maximum current of 500mA.
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