TLV766-Q1: start up time

Shinji Tsuji

Genius 12378 points

Part Number: TLV766-Q1

Hi team,

I would like to control the Vout (set to 0.9V) start up time between 150us to 3ms from VIN=3.3V.

This device has typical 500us soft start.

Could you advise if this device can meet my requirement over PVT?

regards,

over 1 year ago

John Schneider over 1 year ago

TI__Genius 12511 points

Hi Shinji,
Is this an EN startup parameter?

Linked below is a bit of literature on how to insert external circuitry to slow down the rise times of the LDO's startup. This device however does not have any externally adjustable internal softstart. Is this was you're looking for?

http://www.ti.com/lit/pdf/sbva060

Regards,

John

Shinji Tsuji over 1 year ago in reply to John Schneider

TI__Genius 12378 points

Hi John-san,

Could you please give me a tolerance of this soft start timer (typ=500us)?

I don't need to manually adjust the soft start timing, but would like to make sure the variation of the

start up time is within 150us to 3ms.

regards,

John Schneider over 1 year ago in reply to Shinji Tsuji

TI__Genius 12511 points

Hi Shinji,

Sorry for the delayed response, the team is getting back from the US holiday today. There is no hard spec for this at final test, but a 70% variation on the low side and a 500% on the high side is much looser than we would expect our device to perform at. With exceedingly large COUT, you may see the output struggle to get all the way up in time, but that would require excessive COUT.

Regards,

John

Shinji Tsuji over 1 year ago in reply to John Schneider

TI__Genius 12378 points

Hi John-san,

Is there design target spec of the tolerance data? No need to guratee but I need an evidence to make sure it start up within the limit.

regards,

John Schneider over 1 year ago in reply to Shinji Tsuji

TI__Genius 12511 points

Hi Shinji,

We do not have at this time. I will see if design can give that. The 70% spec is from the design team.

Regards,

John

John Schneider over 1 year ago in reply to John Schneider

TI__Genius 12511 points

Hi Shinji,

The design has told us that they believe the start time will not be above a 50% variation across more than 3 sigma, and they do not expect any escapes as low as 70%. The design spec is the 50% number that I initially gave you

Regards,

John

Shinji Tsuji over 1 year ago in reply to John Schneider

TI__Genius 12378 points

Hi John-san,

Thank you very much for your support.

regards,

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TLV766-Q1: start up time