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AEMLION R3 has adjustable output voltage

A project log for Solar harvesting into Li-ion battery

This is a 0.8x0.6 inch board with AEM10941 solar harvesting IC charging a Lithium Ion battery

jasper-sikkenJasper Sikken 11/16/2020 at 20:280 Comments

AEMLION R2 has the two LDOs configured to a fixed 3.3V and 1.8V. This works fine for most people. However some people wanted to further reduce power consumption of their application by lowering the output voltage to resp. 2.5V and 1.8V. Below is the table with Battery and LDO configuration pins of the AEM10941 chip. CFG0[1) can be changed from 1 to 0. With this setting the battery can be used down to 3.01V in stead of 3.60V in R2. 

This change will greatly extend battery life of the application. People asked me how to change the pin. I had to tell them that the CFG[1] is set by a copper trace UNDER the chip, this makes it almost impossible to modify the AEMLION R2 board. 

So no I have redesigned the PCB. In AEMLION R3 the LDO voltages can be set using a 0R jumper resistor.

This board is not for sale yet because I still have large stock of R2, I think in few months I will order a new batch of 100 which has the new design.  

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