Need reset after power on

[abd2327]

hello guys, I am having little problem with esp32 nodemcu, It require reset each time after powering on, I have used my old laptop charger with step down buck and and mobile charger with 2A capacity, but it required to reset each time, why ?? buck output is 5v
using simple blink code with pin2 to blink.

[lbernstone]

The most likely reason is that the power supply is not delivering full power quickly enough, so the esp tries to start, but then gets a power sag. Add some more bulk capacitance (maybe ~22uF) on the input.