I am working on a Li Ion powered device, that requires the following power rails
1. 4V / 2A
2. 3.3V / 1A
So the design that I have planned is
1. BQ24075 - Battery Charge and power path.
2. TPS61235 - To boost the battery voltage to a constant 5.1V at 3A
3. TPS54122 - To make the dual rails at 4V/2A and 3.3V/1A
I have worked with the BQ24075 in the past and I am comfortable with it. However the next two parts I will be using for the first time. I have run simulations to validate the individual design for the parts, however I am not sure when combined could there be some problems. It will be very useful if some one can confirm that this is a viable plan.