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Original question:

TPS53318: TPS53318 shuts off under load

TPS53319: Considering to use this IC to provide 5V@10A for main system power. Still OK to use in 2023?

hamasaki1818
Intellectual 370 points
Part Number: TPS53319

Planned application: 20V from USB-PD stepped down to 5V using TPS53319. Schematic etc hasn't been started yet but will be once the final IC is selected.

Looking for preconfigured parameters for outputting 5V I stumbled across an old e2e post where this IC was shutting down under load: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/639380/tps53318-tps53318-shuts-off-under-load

The datasheet only gives part values and example circuit for 1.2V output. I presume webench probably supports calculating 5V output configuration but I thought it would be better to ask here.

Would this be recommended to use as main DC/DC for stepping down 20V to 5V at up to 10A? Any specific precaution, other than careful layout? The plan is to build this on 4L PCB, for both heatsinking and higher current carrying purposes.


If there are any better suited ICs for this application I'd be interested as well. External mosfet controller is also a possibility, if the controller IC is available/easy to use/currently active/supported.


Thanks!

  • 0
    TI__Mastermind 23640 points

    If powering from a USB-PD on a cable, you may want to use a device that has a higher abs max greater than the 28V of the TPS53319.   

    The 20V is a controlled ramp up but if the cable is jostled when the 20V is active, there may be a transient voltage.     

    TVS can be used to reduce transients.  

    I am not inexperienced with USB-C to know the transient voltage level, but I am aware of the some of the design considerations from previous queries. 

    The TPS53319 is a mature device, release over 10 years ago and it still being designed in.   

    Webench and an excel calculator are available to develop/select external components and would recommend.     The excel sheet is located here https://www.ti.com/lit/zip/sluraz7

    Careful pcb layout, use of snubber on LLnode to ground.     There is an example pcb layout in section 11 of the datasheet.  the example shows the thermal vias  to help with power dissipation and the side copper pours.

    Once your schematic is complete, you can post a schematic review request here on e2e and use the e2e messaging system to send to direct to an engineer if confidentiality is needed.   An e2e connection (like a friend request) must be established prior to sending.   Otherwise, post the schematic here and someone can review.   Same process for the pcb layout too. 

    There are many controllers select from  use www.ti.com/.../products.html

    Nearly active devices will have an evm and the product folders will show inventory and the development tool available.