TPS61021A: Clarification on IC's life

Nithin Kekuda

Prodigy 20 points

Part Number: TPS61021A

Tool/software:

We are using TI Boost IC:- TPS61021A.

If the FB pin connection is left open and made to work in over voltage protection, what will be impact in the IC life.

8 months ago

0 Travis Wang 8 months ago

TI__Expert 8045 points

Hi Nithin,

As long as the pin voltage is not out of spec, there'll be no problem

Best Regards,

Travis

0 Nithin Kekuda 8 months ago in reply to Travis Wang

Prodigy 20 points

As per the statement given in datasheet "TPS61021A limits the valley switch current to approximate 100 mA when the FB pin voltage is below 0.2 V ".

So if the Feedback pin is left open will this condition get satisfied and valley switching current gets limited?

0 Travis Wang 8 months ago in reply to Nithin Kekuda

TI__Expert 8045 points

Hi Nithin,

With good layout, yes.

Best Regards,

Travis

0 Nithin Kekuda 8 months ago in reply to Travis Wang

Prodigy 20 points

As shown in the image if feedforward capacitor(C3) is connected to feedback pin and feedback resistors (R1 and R2) are not mounted what will be the voltage across feedback pin?

What will be the output voltage?

Will 2A load current is supported?

+1 Travis Wang 8 months ago in reply to Nithin Kekuda

TI__Expert 8045 points

Hi Nithin,

The FB pin has quiescent current so the final fb pin voltage will be 0. Vout will be 4.35V.

2A will not be supported with this fb floating condition.

Best Regards,

Travis

0 Nithin Kekuda 8 months ago in reply to Travis Wang

Prodigy 20 points

What will be maximum current supported?

0 Travis Wang 8 months ago in reply to Nithin Kekuda

TI__Expert 8045 points

Hi Nithin,

The inductor current will be limited to 100mA. The output current will depends on Vin and Vout.

Best Regards,

Travis

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TPS61021A: Clarification on IC's life