ESP32-C3-13 MCU build-in LED flickering

[ogedik]

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

[ESP_Sprite]

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

[ogedik]

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

[ESP_Sprite]

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

[ogedik]

Thank you for your great support