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Desktop step-up/step-down UPS power supply

Overview

To facilitate circuit board debugging, a power supply with multiple voltage options is typically required. Therefore, this power supply was created. Its main functions are as follows: 1) Input: Type-C, DC plug, 18650 battery; 2) Output: DC 1.26-26V, current Max=4A, interface: USB-A, pH terminal, pin header. The main features of this circuit are the use of the XL6009 chip and SEPIC circuitry, providing step-up/step-down capability. The input voltage is 3.5~20V (the maximum voltage can be increased by matching a higher voltage capacitor). The layout of the FB and SW terminals has been meticulously designed. Actual testing shows that the output voltage meets the above requirements, and it has strong load capacity (continuous operation of a 20W motor load does not generate excessive heat).

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-27 07:49:00

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