TPS54302: Soft Start Time & Discharge Function

Kazuki Kitajima

Intellectual 1480 points

Part Number: TPS54302

Hello team,

I got a question from the customer.

Could you please tell me the min/max spec for soft-start if your team has this info?

Also, I would like to confirm the discharge time.

This device doesn't have discharge function and discharge time would change depending on load.

Is my understanding correct?

Thank you for your support.

Best Regards,

Kazuki Kitajima

over 5 years ago

0 Ryan Hu (BSR-MV) over 5 years ago

TI__Expert 4035 points

Hi Kazuki,

The soft start time variation as below. This part has no discharge function, so the discharge time depends on the output capacitance and the loading.

Temperature	Min	Avg	Max
25	4.16	4.78	5.47
85	4.47	5.03	5.86
125	4.66	5.31	6.30
-40	3.90	4.63	5.39
150	4.90	5.54	6.47

0 Kazuki Kitajima over 5 years ago in reply to Ryan Hu (BSR-MV)

TI__Intellectual 1480 points

Hi Ryan-san,

Thank you for providing the SS time.

Is this measurement value or sim value?

Best Regards,

Kazuki Kitajima

0 Ryan Hu (BSR-MV) over 5 years ago in reply to Kazuki Kitajima

TI__Expert 4035 points

Hi Kazuki,

Those are ATE char data with three lots silicon.

0 Kazuki Kitajima over 5 years ago in reply to Ryan Hu (BSR-MV)

TI__Intellectual 1480 points

Ryan-san,

Understood.

Thank you for your support!

Best Regards,

Kazuki Kitajima

0 Kazuki Kitajima over 5 years ago in reply to Kazuki Kitajima

TI__Intellectual 1480 points

Hi Ryan-san,

Sorry, I thought this case is closed, but could you tell me 3 things below which are additional questions from the customer?

1: ATE Input voltage setting: voltage level and start uptime(I assume SS time isn't affected by the Input voltage)

2: Definition of SS time: e.g. start point is 0V to the endpoint is the output voltage

3: SS time variation perspective: The temperature is the most dominant spec for SS?

Best Regards,

Kazuki Kitajima

0 Ryan Hu (BSR-MV) over 5 years ago in reply to Kazuki Kitajima

TI__Expert 4035 points

Hi Kazuki-san,

1. ATE data considered the VIN of 4.5V to 28V, if they input was fixed, the variation should be narrower than the above table range.

2. This is ATE data, not bench data. On bench test, some buck defines 0%-90% of Vo, some buck defines 0%-100% of Vo.

3. Yes, temperature is the main factor the variation.

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TPS54302: Soft Start Time & Discharge Function