Other Parts Discussed in Thread: TPS63900, LM66100, TPS2117
Tool/software:
Good evening,
I am designing a power supply system for an IOT sensors working with LORAwan,;
- 3 x Primary Cell (LiSoCl2 , 3.6VDC MAX, D Size ) in Parallels (1S3P config). Primary cells are non-rechargeable batteries.
- Max current needed is 100mA during Transmission and 10uA during sleep.
- Output Voltage is 3.3VDC
- Input Voltage from each primary cell is 3.1VDC to 3.4VDC ( voltage varies due to Load + temperature)
I will use the TPS63900 a buck-boost already used on other projects and it works well.
I need Reverse Polarity and Reverse Current protection for each cell, if one of the cell is damaged or fully discharged ( it can happen that user forget to change all the cells at the same time) it should not be recharged by 'healthy' cells.
I would like to avoid a to use a Schottky diode due to drop voltage 0.3-0.7VDC.
My Idea was to use an Ideal diode like the LM66100 (high RDS 91mOhms) or the TPS2117 MUX (only VIN1 would be used) as the RDS is very low 20mOhm.
If I use TPS2117 I still need to use PMOS with low RDS for Reverse polarity protection.
The ST Pin will be connected to MCU or a Red LED if one of the battery is reversed by user.
Which solution do you suggest me ?
