We currently operate devices on primary LiSoCl 3.0V batteries. In the future we want to offer a rechargeable solution with Li-ion/Li-poly rechargeable battery packs. Our devices can be recharged when they are in a certain position, that allows contact via spring-loaded contacts.
Since the power-supply is a few meters away, and will power multiple devices (20-30pcs), it is desired to use a supply voltage around 9-12V to minimize losses over the connection wires.
The device will have a single cell rechargeable battery with around 700-1200mAh. The desired charging current will be less than 500mA, typically i would estimate 350mA max. The battery-pack will be connected to the device, and its host processor via a short wire. Therefore the desired connection interface is I2C. The battery-pack will also contain the charger, fuel gauge as well as a LDO that supplies 3.3V System Power to the host. A Standalone Charger is not recommend, because we actively want to control if the battery has to be charged or not, for example we would like to control that the battery will only charge if the level is less than a certain threshold.
Our goal is to have as low as possible leakage or quiescent current.
For the fuel gauge, I've selected the BQ27411-G1 because of its easy integration, low quiescent current and i2c interface.
But I'm still looking for a suitable charger IC, that has low quiescent current, but also supports a high input voltage of >13V.
Which IC would be suited best for the described task?
