TPS7A16A: Difference between TPS7A1601ADGNR and TPS7A1601DGNR

Dice-K

Mastermind 7008 points

Part Number: TPS7A16A
Other Parts Discussed in Thread: TPS7A16

Hi support team,

How do the TPS7A1601ADGNR and TPS7A1601DGNR differ in their intended use?

Regards,
Dice-K

over 2 years ago

+1 Edgar Acosta1 over 2 years ago

TI__Genius 12395 points

Hi Dice-K,

TPS7A16A is a spin from TPS7A16A and there are some differences for the EN Voltage requirements and UVLO

TPS7A16A EN pin:

Compared to TPS7A16:

Also, notice the recommended slew rate for TPS7A16A. This question has been addressed several times before:

(+) TPS7A16A-Q1: What is the difference between TPS7A16-Q1 and TPS7A16A-Q1? - Power management forum - Power management - TI E2E support forums

If the slew rate is less than the recommended 1.5V/us, then there should not be any issue using either device.

Best,

Edgar Acosta

0 Dice-K over 2 years ago in reply to Edgar Acosta1

Mastermind 7008 points

Hi Edgar,
Thank you for your reply.

I have understood as follows.
・TPS7A16A is a spin-off from TPS7A16.
・The TPS7A16A has improved EN fast rising capability over the TPS7A16.
However, both recommend less than 1.5V/μs.

If possible, please let me know what kind of issues occur when EN rising is fast.

Regards,
Dice-K

+1 Edgar Acosta1 over 2 years ago in reply to Dice-K

TI__Genius 12395 points

Hi Dice-K,

Yes, your understanding is correct.

If the slew rate is fast enough, it could disable the part.

Best,

Edgar Acosta

0 Dice-K over 2 years ago in reply to Edgar Acosta1

Mastermind 7008 points

Hi Edgar,
And I'm sorry many times.

What issues can occur if EN falls too fast?

Best regards,
Dice-K

0 Edgar Acosta1 over 2 years ago in reply to Dice-K

TI__Genius 12395 points

Hi Dice-K,

I am unaware if there are any issues with the falling edge.

Best,

Edgar Acosta

0 Dice-K over 2 years ago in reply to Edgar Acosta1

Mastermind 7008 points

Hi Edgar,
Thank you for your support.

Section 6.3 says "ramp-up", but section 7.3.1 says "rising and falling".
I'm wondering if I should be concerned about "falling".

Also, I can't find any mention of EN slew rate limits in the TPS7A16 datasheet SBVS171F.
It would be helpful if it was added to the datasheet.

Best regards,
Dice-K

0 Edgar Acosta1 over 2 years ago in reply to Dice-K

TI__Genius 12395 points

Hi Dice-K,

I apologize for the delayed response.

I dont see why the fall time would be an issue, however, I am waiting response from the team to confirm this.

I will have to look into the data sheet and see how to include this, however, it does take some time to get a data sheet updated and published back to the web.

Best,

Edgar Acosta

0 Dice-K over 2 years ago in reply to Edgar Acosta1

Mastermind 7008 points

Hi Edgar,
Thank you for your report.

Please let me know if you have any response from your team about "falling".

Best regards,
Dice-K

+1 Edgar Acosta1 over 2 years ago in reply to Dice-K

TI__Genius 12395 points

Hi Dice-K

I got some feedback in regards this.

The main issue is when having a PWM as stated in section 7.3.1. When multiple pulses occur at these ramp rates, the device can enter test mode and pull Vout down.

This occurs if there is a Vin and EN sees multiple pulse, however, the falling edge should not have any impact. It is very common that the falling follows the rising edge, therefore the use of language here.

In regards the DS, yes I agree, having this information on the TPS7A16 is helpful as well. The time line to get a DS updated is sometimes lengthy, but I will see how to address this for future references.

Best,

Edgar Acosta