PF1550 power path options

[ATAineri]

Hello dear friends. I'm confused with PF1550 datasheet. There is information about power path but I can't understand how it works. If I correct:

1. My analog scheme I should feed from VSYS;

2. VSYS is power path and its output current depends on equality: VBUS_CURRENT (1500 mA) - CHARGING_CURRENT (1000 mA) = 500 mA

Maybe I'm mistaken and VSYS output current is anything else. Maybe VSYS is not power path...

Sorry, but my English is not good enough to understand so big document, please help me.

Perfectly, I want to charging my battery with 1A current minimum (1.5A recommended) and drive my analog scheme from power path when I need 3.7V and 1.5A too. Is it really with PF1550 or should I use something enough to provide such a power path for my analog scheme?

CPU: i.MX7ULP with LPDDR3.

[JozefKozon · Accepted solution]

Hello Vladislav,

I apologize for a late reply. I have just received an answer from an application engineer I have contacted regarding your question. Please see the description.

DESCRIPTION

I think the customer want to know if they can use VSYS to  supply power to external .

Yes , he can  use VSYS in this way.  

 If  VSYS load is heavy , It can work on Supplement mode , and Battery stop charging  , or change to  dicharge if  VSYS < Vbat.

The max  current capability  VSYS can  power to  external  is: 

VBUS_LIN_ILIM(Max 1500 mA)  minus   VSYS current to power PMIC (3BUCK+3LDO ). 

Customer  can ignore the charging current to battery here.  

With Best Regards,

Jozef

[ATAineri]

Thank you very much!