Low Voltage Step-Down Converter

Posted on Feb 6, 2014

Sometimes you have a situation where you have a 5-V supply voltage but part of the circuit needs a lower supply voltage. A voltage regulator from the Texas Instruments TPS62000 family [1] is a good choice for this if the current consumption is less than 600 mA. You can thus use this device to build a very compact, highly efficient voltage converte

Low Voltage Step-Down Converter
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r. A sample layout generated by the author is available as a file on the Elektor website. The TSOP62000 provides an internal reference potential of 0. 45 V, which can be used to set the output voltage in the range of 0. 5 V to 5 V by means of resistors R2 and R3. The formula for this is: Vout = 0. 45 V (0. 45 V) G— (R2 / R3) For relatively low voltages, the value of inductor L1 should be 10 H, but a value of 22 H is better if the output voltage is 3. 3 V or more. The input voltage can be anywhere in the range of 2 V to 5. 5 V, and of course it has to be higher than the desired output voltage. The output voltage is 3. 3 V with the indicated component values and an input voltage of 5 V. If you want to reduce the component count even further, you can use a member of the family with a fixed output voltage. The available voltages are 0. 9, 1. 0, 1. 2, 1. 5, 1. 8, 1. 9, 2. 5, and 3. 3 V. With this approach you can omit R2, R3 and C3, so the output can be connected directly to pin 5.

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