Pico D4 with a Lipo battery

[Fugazi]

Hi,

Having some troubles with powering a pico d4 with a lipo battery.

Using a ht7333 or ht7833 regulator with a 3.7v lipo battery that I used for the standard esp32 successfully, the pico d4 reports brownouts on boot everytime.

Any ideas how to power with a lipo ?

Thanks

[mikemoy]

You can't simply just slap a LiPo batter to the input of any regulator, and expect it to work.
There is a thing called dropout voltage for regulators. For example, some regulators need to be fed 1.2v above the voltage you want it to regulate at. You need to look at the data sheet for that regulator to find out what it is.

[ESP_Sprite]

HT7333 is never going to work as it only can deliver 250mA. HT7833 should theoretically work, if your battery is full enough. Are you sure you did add the capacitors around the LDO, and are you keeping the lines between the LDO as short and low-impedance as possible?