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PMP41062: Power path / Power supply questions

YoonJin Kim
Intellectual 850 points
Part Number: PMP41062
Other Parts Discussed in Thread: BQ25756, TPS25751

Tool/software:

Hi team,

I have two questions as below. Look forward to get your insight on these.

1. 

There is two power supply for PD (3.3V/5V) from the reference schematic. Battery > 5V Buck converter > LDO 3.3Vout

What is the purpose of the 5V Power supply? Is it required for 3A Load switch operation? If I don't use the load switch, can I remove it? 

I am wonder if CC power also requires this 5V pull up power.

2. 

Is TPS25751+BQ25756 can support charging + discharging with one path? It seems charger supports the bi-directional but I am not sure if this ref. board support one path charge/discharge as well.

3.

I am doing project (power bank) which should support battery power (12~18V), USB output power (5/9/12/20V) as below table.

Should I add load switch for this application? or just connect two port to VBUS?

Voltage 

Port1 (USB-C)

IN: 5V/3A, 9V/3A, 12V/3A, 15/3A, 20V/3A, 20V/5A
OUT : 5V/3A, 9V/3A, 12V/3A, 15/3A, 20V/5A

Port2 (USB-A)

OUT : 5V/4.5A, 9V/2A, 12V/1.5A
  • 0
    TI__Intellectual 1580 points

    Hi,

    1, yes, 5V bias power is for PD controller as well as VCON power

    2, The power path is bi-directional, so it will support both charge and discharge function

    3, I am not doing power bank, but basically, i think it is similar to this design, which require a power path for bi-directional operation