ESP32 Forum

Hi,

I am designing a sensor circuit board based on ESP32-C3-13 MCU. Power is supplied by MCP 1700 - 3302E LDO circuit at the top of the attached schematic. The problem is occurring at boot phase. When I power up circuit build-in LED on MCU flickering for a while and the start MCU. Flickering time is not constant. On LDO circuit I use 100 uF tantal capacitor (C2 on schema). When I replace tantal capacitor with 100 uF electrolytic capacitor problem fixed.

The question is why I face with flickering problem with tantal capacitor?

Please find schema attached into the message.

Best regards,

Orkun Gedik

The MCP1700 can only deliver 250mA. We highly recommend feeding ESP chips with a power supply capable of delivering >=500mA.

Thank you so much for your precious and clear reply ESP_Sprite. Can you recommend a regulator can be replaced with MCP1700 to use 3.7v LiPo on ESP circuits?

Best regards,

Orkun Gedik

I personally have good experiences with the HT7833 chips, but there are others that may be more applicable to your situation.

Thank you for your great support