I am developing small board with MCU, lithium battery and USB OTG and I am wondering what is the simplest way to power up the whole thing?
- If USB cable is connected - PMIC detects type of the charger(from PC / wall charger) and charges battery with maximum available current. Also stable 3v3 should be provided for MCU.
- If charger is removed - PMIC supply 3v3 output for MCU.
- If USB OTG cable connected - PMIC supply 3v3 for MCU and 5v to USB.
So I've found RT9460, which does not provide stable output. External DC-DC is needed. There is LTC3576 with 3 programmable power outputs, but that's a bit overhead for me. Maybe there is a simpler solution?