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Original question:

TPS552882: Used as current source

TPS552882: CC mode under 0.8V and Current sharing using SYNC pin.

Kristián Szalay
Prodigy 20 points
Part Number: TPS552882
Other Parts Discussed in Thread: TPS55288, BQ25730

I would like to use the TPS55288 to charge supercaps from a USB PD source.

The original plan was to use BQ25730 because it’s higher charge current but as it clamps charge current to 384mA under VSYS I had to look for another IC. 

What I need:

  • Programmable output current limit 
  • USB PD compatibility
  • Ability to work in CC mode from 0V to charge SuperCaps
  • I2C communication 

 After my research it seems the only appropriate IC is the TPS55288. The only thing I’m not sure is the CC mode under 0.8V. 

Question_1:

If the output current wont exceed the coil peak current (under 0.8V on supercaps), the IC wont detect short circuit and wont enter HICCUP mode? 

Question_2:

Is it possible to share load between two TPS55288 using the SYNC pin and current share OR-controller (for example LTC4370)?

  • 0
    TI__Mastermind 34231 points

    Hi Kristian,

    Thank you for reaching out.

    1. When TPS55288 output voltage is below 0.8V and average inductor current is above the setting value, the device enters into hiccup mode. If you use TPS55288 (I2C version), you can disable the hiccup function in I2C register. 

    2. It should be OK to use a current share OR-controller to share load between two TPS55288.