Battery power from 1 LIPO and 3v3 regulator LDO can't turn ESP32 on

[Deouss]

So maybe adjust the converter output to 3.3V - I wouldn't use linear voltage regulators in such case then

[ankgt11]

- HT7333 chips can only output 250mA. You need at least 500mA to be able to provide peak power for the RF bits in the chips.
- The dropout voltage of this chip can easily reach >1V (@250mA) which means the ESP32 and the flash chip will only get 2.7V. While the ESP32 likely is OK with it, this browns out most flash chips leading to crashes.

Suggest you try a different LDO. Not an official suggestion, but I personally have good experiences running the ESP32 from a HT7833.

I realise this is an old thread but I am also planning to use the HT7833 as per your suggestion. The only concern I have is that the datasheet lists the maximum power dissipation for the SOT23-5 package as 0.2 W.

Do you think this will be enough for the ESP32-WROOM-32 module? As per the datasheet the maximum power draw is 0.5A, but in my practical measurements the power consumption seems lower at around 0.3A when in access point mode (which I am using). So assuming a voltage drop of 0.7V and this current, the power works out to just about 0.21W.

Do you this this is OK (based on. your practical experience with this chip), or do you use the larger SOT89 package?

Thanks!

[ESP_Sprite]

Do you this this is OK (based on. your practical experience with this chip), or do you use the larger SOT89 package?

Thanks!

I generally use the SOT89 package indeed. The 0.21W may possibly be OK for the SOT23 if you make sure the chip has a nice and large ground plane to sink the heat into.