Hi,
I have a question about the bq27410-G1 and bq27210 gas gauges. I try to decide which gas gauge to use. I have a 130mAh LiPo built in battery in my application. The pack only integrates a protection circuit and only has 2 wires, so no temperature monitoring. I do not need extremly precise monitoring.
It is an ultra-low power application, so power consumption of the gas gauge is an issue. It also is a space-constrained application.
I want to use the TPS65720 for charging and the DC-DC converter, but as I understand this device does not have built-in gas gauge, so I wanted to add it seperatly.
First I picked the bq27210 because of its much lower power consumption than the bq27410-G1 (52 vs 103 uA in active mode) even though I would have liked the smaller package of the bq27410-G1. But then I found out that the parametrics table says that the bq27210 has a minimum battery capacity of 300mAh. I did not find anything about that in the datasheet. Can anyone confirm that this is true? Seems odd that the datasheet does not mention that. Or did I overlook it?
Is there a better IC for my problem? There is no statement about a minimum battery capacity for the bq27410-G1, even though it consumes more power. Shouldn't it be the other way around? Lower power consumption gauges should support lower capacity batteries...
I know that the bq27410-G1 uses a more precise technique for measurement (Impedance Track) but is there a ultra-low power gauge for small battery capacities?
Daniel