TPS63001: Start Up at Pre Bias condition

Shinichi Inoue

Guru 20261 points

Part Number: TPS63001
Other Parts Discussed in Thread: TPS63031,

Dear Specialists,

My customer has a question about Start Up at Pre Bias condition.

I would be grateful if you could advise.

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An external 3.3V is connected to the output of the TPS63031 via a 50kΩ resistor.

(1)Does it support pre-bias startups?

(2)If OK, current flows into the device from 3.3V through a resistor.

Is there a limitation on the inflowing current of output pin?

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I appreciate your great help in advance.

Best regards,

Shinichi

over 3 years ago

0 Shinichi Inoue over 3 years ago

Guru 20261 points

Sorry,

TPS63031 is a typo.
The correct is TPS63001.

Shinichi

0 Minqiu Xie over 3 years ago in reply to Shinichi Inoue

TI__Mastermind 21565 points

Hi Shinichi:

It can support prebias startup.

But I didn't get the point about 50kΩ. If you are talking the load current, then it should be 3.3V/50k=66uA.

0 Shinichi Inoue over 3 years ago in reply to Minqiu Xie

Guru 20261 points

Hi Minqiu,

Thank you for your reply.

I understand TPS63001 and TPS63031 are support PreBias, is it correct?

Yes, external 3.3V is supplied to the OUT of TPS63001 or TPS63031 via a 50kΩ resistor.

The device OUT is supplied with a current of 66 μA, is there any problem.

The customer'd like to know how much the inflow current of the OUTPUT pin can withstand.

I appreciate your great help and cooperation.

Best regards,

Shinichi

0 Minqiu Xie over 3 years ago in reply to Shinichi Inoue

TI__Mastermind 21565 points

Hi Shinichi:

What's the target Vout you set? Is it same as 3.3V or lower than that?

0 Shinichi Inoue over 3 years ago in reply to Minqiu Xie

Guru 20261 points

Hi Minqiu,

Thank you for your reply.

I'll confirm the customer and then feedback to you.

I appreciate your great help.

Best regards,

Shinichi

0 Shinichi Inoue over 3 years ago in reply to Shinichi Inoue

Guru 20261 points

Hi Minqiu,

I could get the output voltage.

The voltage is 3.3V.

I appreciate your great help.

Best regards,

Shinichi

0 Minqiu Xie over 3 years ago in reply to Shinichi Inoue

TI__Mastermind 21565 points

HI Shinichi:

If the Vout is same as prebias, You can set the converter in power save enable. So there is no reverse current.

0 Shinichi Inoue over 3 years ago in reply to Minqiu Xie

Guru 20261 points

Hi Minqiu,

Thank you for your reply.

When there is no input power supply(0v),device is shut down.

At this time external 3.3V is applied to the Vout of the device and current flows in.

Is there any problem?

Is there a limit value for inflow current?

I appreciate your great help and cooperation.

Best regards,

Shinichi

0 Minqiu Xie over 3 years ago in reply to Shinichi Inoue

TI__Mastermind 21565 points

Hi Shinichi:

It's no problem. There is only some small leakage current.

0 Shinichi Inoue over 3 years ago in reply to Minqiu Xie

Guru 20261 points

Hi Minqiu,

Thank you for your reply.

I understand the leakage current is 66uA, ti' no problem.

I'll share this with the customer.

If they have an additional question, I consult you again.

I appreciate your great help and cooperation.

Best regards,

Shinichi

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TPS63001: Start Up at Pre Bias condition