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TL720M05-Q1: new and legacy chip reason

Ann_Lien
Genius 14760 points
Part Number: TL720M05-Q1
Other Parts Discussed in Thread: TPS7B86-Q1

Tool/software:

Hello expert,

My customer has questions on TL720M05-Q1 new and legacy part,

1. What is the reason to have new chip? Original 45V could sustain 40V and why we need down to 40V? 

2. How can we tell apart the legacy and new chips? Is legacy part only HTSSOP package?

3. What is the next generation to replace TL720M05-Q1? Is TPS7B86-Q1 suitable to replace it?

Best regards,

Ann Lien

  • +1
    TI__Expert 6640 points

    Hi Ann,

    Thanks for these questions.

    Ann_Lien said:
    1. What is the reason to have new chip? Original 45V could sustain 40V and why we need down to 40V? 

    The motivation behind creating a new chip for TL720M05-Q1 is for supply continuity. The fab that runs legacy TL720M05-Q1 material is closing, and by transitioning this device to a new chip, it allows the customer continuity (instead of EOLing the device, for example).

    There is a difference in the Vin rating for legacy vs new chip variants of this device, as you note. However, this is not expected to impact the vast majority of use cases for this LDO, since 12V-battery-connected LDOs typically require a Vin rating of only 36V to handle load dump conditions. Please let me know if your customer is experiencing a problem with the 40V Vin rating, though.

    Ann_Lien said:
    2. How can we tell apart the legacy and new chips? Is legacy part only HTSSOP package?

    For devices impacted by TI's 300mm transition plans, the way to tell if an OPN is legacy or new chip is by checking the chip source origin (CSO) on the shipment box/bag. Legacy material will be labeled "SHE," new material will be labeled "RFB." It's not possible to check what material will be received prior to receiving the shipment and checking the label.

    To offer the customer more visibility/flexibility, 300mm-transition LDOs also have an "M3" OPN option. OPN variants with "M3" are guaranteed to ship with only 300mm material and are identical to new chip variants of the non-M3 OPN (ex. TL720M05QKVURQ1M3 is identical to new-chip TL720M05QKVURQ1).

    As you noted, TL720M05QPWPRQ1 (HTSSOP package) will only be available with the legacy chip, and there are better LDOs for new designs from supply, cost, and performance perspectives.

    Ann_Lien said:
    3. What is the next generation to replace TL720M05-Q1? Is TPS7B86-Q1 suitable to replace it?

    Since TL720M05-Q1 is now 300mm, it is considered a hero device. However, if the customer wants to use an alternative, TPS7B8850QKVURQ1 is p2p.

    Regards,

    Kelsey