Pico D4 with a Lipo battery

Fugazi
Posts: 41
Joined: Wed Apr 26, 2017 9:05 pm

Pico D4 with a Lipo battery

Postby Fugazi » Tue Feb 18, 2020 10:34 am

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
Posts: 448
Joined: Fri Jan 12, 2018 9:10 pm

Re: Pico D4 with a Lipo battery

Postby mikemoy » Tue Feb 18, 2020 2:36 pm

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
Posts: 3263
Joined: Thu Nov 26, 2015 4:08 am

Re: Pico D4 with a Lipo battery

Postby ESP_Sprite » Tue Feb 18, 2020 3:25 pm

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?

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