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TPS92661-Q1: Can only one VIN terminal be connected to power supply?

Part Number: TPS92661-Q1

 Hello guys,

 One of my customers is going to evaluate TPS92661-Q after their own PCB making. TPS92661-Q1 has 2 terminals named VIN. According to  Figure 26 in the device datasheet(SLUSBU2A), the resistance between each VIN is very low.

 The customer wants to use the device with one terminal of VIN connection to power supply due to pattern routing limitation. Is it no problem such VIN terminal connection?

 Also in the case of 4pcs of the device cascading, the customer wants to supply rower to the next TPS92661 VIN through the previous TPS92661 VIN terminal.

 For example, the power supply output is connected to only VIN terminal (No.14) of the first device. The second device VIN terminal (No.14) is connected to only the other VIN terminal (No.23) of the first device.

 Is the case of this, is thier any problem? Could you please give me your reply?

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

 

  • Kazuya,

    The TPS92661-Q1 was designed to minimize the routing constraints.  It is sufficient to connect VIN to only one of the two pins.  It is also fine to connect the power supply to Pin 14 of the first device and connect Pin 23 of the first device to Pin 14 of the second device and so forth.  A decoupling capacitor needs to be placed near the VIN pin for each device.

    Regards,

    David Street

  • Hello David,

    Thank you very much for your prompt reply.
    Your reply is very helpful for the customer and me.

    Thank you again and best regards,
    Kazuya Nakai