Good boost converter. I connected it to about 3.6V, set the output to 5V and connected a regulated load. The output voltage stayed at 5V up to a load of just over 1.3A. At this load it was found that a thermal shutdown had occurred and the voltage dropped rapidly. According to the specification, the XL6009 used in this circuit has thermal protection and protection against excessive switching current (max. 4 A). If you want to get close to the 4A limit, you need a serious heatsink.
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