LP8866-Q1: CPUMP current

Shuji Ishiwata

Part Number: LP8866-Q1

Hi All,

I have a question about the CPUMP pin of the LP8866-Q1.

(1) Please tell me the theoretical value of the current of the CPUMP pin.
(2) Please also tell us about the theoretical value of the inrush current when the voltage of the CPUMP pin rises.

<conditions>
VIN 26V
VDD 3.3V
Ccpump 4.7uF (Conect to CPUMP pin)
SW Freq. 500kHz

Best Regards,
Ishiwata

over 3 years ago

0 Zhiqian Wu over 3 years ago

TI__Mastermind 33055 points

Hi, Shuji

why you want to know this value? any problems?

0 Shuji Ishiwata over 3 years ago in reply to Zhiqian Wu

Mastermind 8080 points

Hi, Zhiqian-san,

I confirmed the intention of asking the customer.

After inputting VIN and VDD, an inrush current was generated in VDD (3.3V) at the timing when EN was input from L to H and LED lighting started.
During the evaluation, this inrush current was observed at the timing of the voltage rise of the CPUMP pin, so I asked a question about the CPUMP pin.

The customer wanted to know the factors and characteristic values for the VDD inrush current.

First of all, please answer the CPUMP question from the other day.

Best Regards,
Ishiwata

+1 Zhiqian Wu over 3 years ago in reply to Shuji Ishiwata

TI__Mastermind 33055 points

Hi, Shuji-san

The inrush current leads by the charge of caps for CPUMP, we don't have this spec.

It is related the cap customer chosen.

0 Shuji Ishiwata over 3 years ago in reply to Zhiqian Wu

Mastermind 8080 points

Hi, Zhiqian-san,

Sorry for my late reply.
I understand
I will pass your reply on to the customer.

Thank you for your support.

Best Regards,
Ishiwata

0 Zhiqian Wu over 3 years ago in reply to Shuji Ishiwata

TI__Mastermind 33055 points

Hi, Shuji-san

Do you have any other questions?

0 Shuji Ishiwata over 3 years ago in reply to Zhiqian Wu

Mastermind 8080 points

Hi, Zhiqian-san,

At this time, there are no additional questions from customers regarding this content.

Best Regards,
Ishiwata

0 Zhiqian Wu over 3 years ago in reply to Shuji Ishiwata

TI__Mastermind 33055 points

Hi, Shuji-san

If there are no other questions, pls close this topic.

And you can open another topic for other questions.

Thanks

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LP8866-Q1: CPUMP current