For a solar powered project I'm using a 5V solar panel to keep a 3.7V Li Ion battery topped up.
The Li Ion charge regulator IC is an MCP73831T and can handle a Vin from 3.75V to 6V. This is fine for the most part but the solar panel can actually output up to 10V when in direct sunlight. And so I wanted some sort of over voltage protection for the charge regulator IC which doesn't compromise too much current.
I looked into standard voltage regulators but these require a much higher input voltage. LDO regulators could work but I don't think they would be able to handle the power dissipation.
I also looked at Zener diodes but these work by conducting current once their reverse breakdown voltage is reached. I'm worried that this will reduce the current used for the charging the battery and so isn't an efficient solution. (Correct me if I'm wrong)
I was wondering if there was some sort of voltage clamp IC or circuit which operates normally until the voltage gets too high and then it can regulate it. Looking for an efficient solution since the solar panel can only produce 500mA max and I want as much of this to be used for charging the battery when it's available.