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TPS2373: TPS2373 vs. TPS2372

Part Number: TPS2373
Other Parts Discussed in Thread: TPS2372

Hi,

We saw some different features that are listed in product comparison table about TPS2372 and TPS2373 as below:
Could you please tell us more details about those difference to differentiate those two models?
TPS2372-3/4: Autoclass, Inrush delay.
TPS2373-3/4: Adaptor priority, Advanced startup.

Could we interpret that those features listed in TPS2372 but not be included in TPS2373 are not supported in TPS2373?

Thank you.

Jeff

  • Jeff, You have it correct. While both devices are offered in the same package footprint (20 pin, 5x5, QFN), and are both IEEE802.3bt standard-ready, each one has features that the other does not. Below is a short table listing the unique features for each one:

    TPS2373 (-4 and -3): Advanced startup (pins 14 and 15), Adapter Priority (pin 10), UVLO Select (pin 16)
    TPS2372 (-4 and -3): Autoclass (pin 10), PSE Inrush Delay Enable (pin 16)

    Note that pins 14 and 15 are 'No Connects' on the TPS2372.

    Another way to think of it would be to ask "Why would someone pick the TPS2372 over the TPS2373?" In general, customers prefer to use the TPS2372-3/4 if:
    * Designing for a dual PoE input application
    * Using off-the-shelf DC/DC modules (and only Power Good (PG) is needed to enable the DC/DC module)
    * Utilizing a non-isolated power stage (like lighting)
    * Designing for "Forced UPOE" and/or "Hitless Failover" features (example: 2 separate CAT-5 cables, 2 PD IC’s and 1 DC/DC)
    * Autoclass is required
    * Not wanting to pay the additional price markup for the Advanced Startup feature included in TPS2373-3/4

    In conclusion, I would also like to recommend you watch the following videos:
    * Introduction to TI's Full IEEE802.3bt Portfolio --> training.ti.com/introduction-tis-full-ieee-8023bt-portfolio
    * Understanding Autoclass in TI's IEEE802.3bt Powered Devices --> training.ti.com/understanding-autoclass-tis-ieee8023bt-powered-devices-pd
    * Designing dual-input PoE PD systems --> training.ti.com/designing-dual-input-poe-pd-systems-power-redundancy-smooth-transition-and-power-sharing
    * Understanding Advanced Startup in TI's IEEE802.3bt Powered Devices --> COMING SOON (I will update this post with the link once posted)

    Thank you for your interest in PoE products from Texas Instruments,