I'm planning on using TPS63020 to supply 3.8v from Lithium Polymer battery. Most of the time my circuit uses about 200mA with some short bursts of 2A.
As the source is a Lithium Polymer battery i want to make sure not to over discharge it and i was wondering if the VINA pin on the TPS63020 can be used in a similar way as the UVLO pin on the TPS61200. The TPS63020 datasheet isn't as clear about this as the TPS61200 one. From what i understand TPS63020 continues operating normally until the VINA voltage drops below 1.5v (for TPS61200 it's 250mV). I'd assume i can simply use a voltage divider from the VIN to set the shutdown voltage? I want the module to shut down at 2.6v. The VIN operating range is 2.6-4.2v.
To set the voltage at 2.6v i've selected the first resistor in the voltage divider to 187k and the second one to 255k.
Schematic:
Will this operate as required?
A couple additional questions:
- I don't need PG. Can i leave it floating?
- The datasheet says on page 18 "A small capacitor C2 = 10pF, in parallel with R2 needs to be placed when using the Power save mode and the adjustable version, to provide filtering and improve the considerably the efficiency". This doesn't show up in any of the reference designs but i've included it (C13). Am i misunderstanding something as the C2 on the datasheet always refers to the output smoothing caps?
