LP2951: Regarding the description of Vsense in the latest datasheet

Conor

Guru 12165 points

Part Number: LP2951

Tool/software:

Hi,

We would like to confirm a potential inconsistency in the datasheet for LP2951 (including the latest revision Rev.K).

■Subject of Concern
Section 5.1 "Absolute Maximum Ratings"

VSENSE Absolute Maximum Rating: 5V (MAX)

■Our Concern
For the fixed 5V output version of LP2951, it is common to connect the SENSE pin directly to the OUTPUT pin.
However, based on the following observations, we believe that the output voltage can exceed 5V, potentially causing the voltage at the SENSE pin to exceed the stated 5V maximum rating:

In section 5.5 "Electrical Characteristics", the maximum output voltage is listed as 5.1V (Legacy) and 5.04V (New chip)
Transient response graphs (Figure 5-46 and Figure 5-48) show the output voltage temporarily exceeding 5V

Therefore, we are concerned that the current 5V MAX rating for VSENSE may not be aligned with actual device behavior in typical use conditions.

Could you kindly confirm whether the current specification for the absolute maximum rating of the VSENSE pin is correct?

Best regards,
Conor

5 months ago

0 Daniel Esparza 5 months ago

TI__Expert 4075 points

Hello Conor,

Thank you for pointing out the discrepancy in the datasheet. Please allow 2 to 3 business days while I find more information that can help us better understand and resolve the contradiction.

Best regards,

Daniel E.

0 Daniel Esparza 5 months ago in reply to Daniel Esparza

TI__Expert 4075 points

Hello Conor,

The supported VSENSE Absolute Maximum Rating is 6V and the table from section 5.1 in the datasheet will be updated in the next revision to reflect this.

Thank you for contacting TI E2E design support forums.

Best regards,

Daniel Esparza.

0 Conor 5 months ago in reply to Daniel Esparza

Guru 12165 points

Hi Daniel,

I understand that the datasheet will be revised again.

Due to our internal flow, we cannot approve the adoption of the device if the datasheet remains at 5V, so could you please make the corrections to this section first and send us the draft version (after corrections)?

We have had the same process done for a different part number in the past.

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/1426834/lmx2430-ftest-ld-output-pin-operates-as-an-open-drain-output-depending-on-the-mux-3-0-setting/5492629#5492629

Thanks,

Conor

+1 Daniel Esparza 5 months ago in reply to Conor

TI__Expert 4075 points

Hi Conor,

Thank you for your message. We will evaluate options to update the datasheet per your request.

Regards,

Daniel Esparza

Power management

Power management forum

LP2951: Regarding the description of Vsense in the latest datasheet