V62/06626-01YE Qualification and start up

Hi Heidi,

I am checking with my team on these questions and will get back to you with an update tomorrow.

I would like to note, however, that this is a legacy device which TI does not have have any plans to refresh. I would strongly encourage you to move to a different device.

TPS73601QDBVRQ1 is a very similar device replacement in a SOT-23-5 package, but it is only qualified to -40C, as opposed to -55C for V62/06626-01YE.

If there are any socket requirements you're able to share, including any of the following, that will help me make the best alternative device recommendation:

Maximum and nominal input voltage

Maximum and nominal output current

Desired output voltage

Operating temperature range

Are there any feature requirements, such as enable or integrated reverse current protection?

Is low noise required?

Is there any package or size constraint?

Regards,

Kelsey

Hi Kelsey,

Thanks for checking into this.  We've actually been using this part for many years.  We've been doing some component level testing, and finding some issues at cold temp, which is why we're asking some questions. In our application (which doesn't even go down to -40C, we aren't actually having any trouble.  But we do need to explore the cold temp issues at component test.

Thanks!

Heidi   

Hi Heidi,

Understood. Based on the issues you're having with these enhanced parts at the temperature guaranteed in the product datasheet, I recommend returning the parts for failure verification. HERE is a link to return FAQs.

What is the % of rejected devices? 

Is startup timing the only type of issue that is being observed?

Regards,

Kelsey

Hi Kelsey,

We do have return authorization CPR No. CPR231089782 and the two part were received on Monday at TI.  The questions we are asking here are about how the parts were qualified and how they should operate per the datasheet (regardless of the failures were are seeing).  The failure is related to Vout accuarcy, not actually start up.  We are asking about start up to make sure the test program isn't trying to read the data to quickly.  We have another question, all three are below

• We were able to download qualification data from the TI website.  Can you confirm whether the part qualified in this package or was it qualified in a different package and moved into this package?
• What is the longest time it should take the part to start up at -40degC, -55degC?
• Per the datasheet, the parameter Vout Accuracy, Over VIN, IOUT and T is ±1% . What is the 1% relative to? Is it 1.2V or is it an initial measurement at each part to determine a nominal output?  For example, if a particular part measures 1.198V instead of 1.2V, is the accuracy 1% of 1.198V or 1% of 1.2V?

Hi Heidi,

Got it, thanks for the additional details. I'm following up with our design and quality teams for this data, I will let you know ASAP what I hear back. I'd expect an update in a day or two.

Regards,
Kelsey

Hi Heidi,

I've received feedback from our quality team that this device was qualified in the SOT-23 package (package designator code DBV).

The design team does not have the bandwidth to get us information on maximum startup time at -55C and -40C until next week, so I will update you again once we have that information.

Let me know if you have any questions in the meantime.

Regards,
Kelsey

Hi Heidi,

Our design team ran simulations for startup time; for TPS736 (400mA) at 1.2V V_OUT at -55C, it takes around minimum of 15us and a maximum of 62.5us to startup with 0.1uF recommended output capacitance.

Attached are the simulation results of the same.

Regards,

Kelsey