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UCC33020-Q1: Is it OK to Connect Multiple UCC33020-Q1 Output VCC in Parallel Directly?

lee c.
Prodigy 10 points
Part Number: UCC33020-Q1
Other Parts Discussed in Thread: UCC33420-Q1, UCC14241-Q1

Tool/software:

In order to have a higher power output, is it OK to connect multiple UCC33020-Q1's output VCC in parallel directly? Or, do they have to go through a diode respectively before connecting together?

Thanks.

  • 0
    TI__Genius 15616 points

    Hi Iee,

    What are your input voltage requirements? If 4.5V<VIN<5.5V I recommend using UCC33420-Q1 which can deliver 1.5W @Ta=25C. If your VIN requirements are wider 3V<VIN<5.5V, then UCC33020-Q1 is the right option, which can deliver 1W @Ta=25C. 

    Does your system require more power than 1.5W or 1W? If yes, these devices do not have a synchronization pin in order to share load and both deliver the same amount of power. What I recommend is to separate loads into subgroups (see below)

    Thank you

  • 0 in reply to Manuel Alva Hernandez
    Prodigy 10 points

    Thanks for the info and idea.

    I am wondering if you could advise any similar device with synchronization pin for load sharing?

  • 0 in reply to lee c.
    TI__Genius 15616 points

    Hi Lee,

    We do not have a 5V/5V devices with a synchronization or feedback pin. UCC14241-Q1 or devices of the same family have a feedback pin that can be used to parallel devices. The drawback is that the VIN range of those devices are lower. 

    Thank you

  • 0 in reply to Manuel Alva Hernandez
    Prodigy 10 points

    Hi Manuel,

    Did I miss anything here, but I just checked the UCC14241-Q1 and it seems having higher voltage range (21V - 27V) than UCC33020-Q1 (3V - 5V).and I did not see any feedback pin for load sharing. Maybe you were mentioning the wrong part?

    Thanks.

  • +1 in reply to lee c.
    TI__Genius 15616 points

    Hi Lee,

    Sorry for the confusion. I meant to say that these devices have higher VIN. These devices can be used in Single output mode and they have FB pins (pointed out below).

    Thank you