LP2954: LP2954 SOIC/unused pin

Yuto Sakai

Mastermind 6100 points

Part Number: LP2954

Hi,

Let me know how to connect unused pins.

Our customer is planning to keep unused pins open.

Is this a problem?

【condition】

・LP2954IMX/NOPB

・Vout = 5V

・unused pins→/error pin,VTAP pin,Feedback pin(When 5 Vfix type, is TAP and FB pin necessary?)

Best Regards,

Yuto Sakai

over 6 years ago

0 David Hopkins over 6 years ago

TI__Expert 8905 points

Hi Yuto,

Vtap and feedback should be connected together on the PCB for fixed operation. The error pin can be left floating.

Datasheet sections for more information:

Regards,

David

0 Yuto Sakai over 6 years ago in reply to David Hopkins

Mastermind 6100 points

Hi David-san,

Thank you for your reply.
In addition, when programming for any voltage by connecting an external pair of resistors, is the "SENSE" and "VTAP" unused pins?
If Yes, please tell me how to connect when these two pins are not used.
Is it recommended to be "SENSE" and "VTAP" left floating?

Best Regards,
Yuto Sakai

0 David Hopkins over 6 years ago in reply to Yuto Sakai

TI__Expert 8905 points

Hi Yuto-san,

When using external resistors SENSE and VTAP are unused, so just leave them floating.

Regards,
David

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LP2954: LP2954 SOIC/unused pin