LM66200: Load Sharing Solution for Dual 3.6V Li-ion Batteries

Hi Harold,

LM66200 does not have the ability to output both inputs at once, so when VIN1 = VIN2 it would be down to a comparison of mV differences. If the load current is high, this could even mean that the device constantly switches between inputs due to dip from load steps on the batteries.

I recommend reading this thread too - it is a continuation to the link you posted.

Also, there's the option to use TPS2116 or TPS2117, which can be designed to use one battery until it is discharged then use the other battery.

Please let me know what you think of these ideas and if you have additional questions.

Thanks,

Patrick

Hi Harold,

Understood - then it looks like two LM66100s in parallel would be your best bet. The only thing to make sure of is that the batteries will be strong enough to provide 0.5A typ, enough to make CE > VIN + 35mV when CE is connected to VOUT.

The batteries will be rechargeable, correct?

Thanks,

Patrick

Hi Hal,

Understood - I'd like to bring to your attention for consideration that connecting both CE pins to the output will avoid the scenario where both inputs switch off, as the output (CE pins) will drop below the inputs if not powered.

Additionally, if your application can take a small voltage drop from the inputs, you can put some small resistors on each VOUT pin and connect CE to the load side of that resistor to both reduce the current threshold for reverse current blocking and limit the charging current that one of the batteries will experience when the other is at a higher voltage.

Would that work for your system?

Thanks,

Patrick