TPS40040: TPS40040 inquire output spec 40A/2.8v

Lawrence He

Genius 3280 points

Part Number: TPS40040
Other Parts Discussed in Thread: LM2748, LM2745

Dear,

our client want to design a buck controller as the spec below:

Vin:3.8V

Vout:2.8V

Iout:40A

1. Why the current limit is 15A in TI.com

2. Is TPS40040 can change MOSFET and inductor to meet output spec 40A/2.8V?

3. If can not support to 40A, is there any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence.

over 6 years ago

0 Mathew Jacob1 over 6 years ago

TI__Expert 5900 points

Lawrence,

What is the target efficiency? It is quite challenging design spec because of the low input voltage for such high current.
Would a bias voltage rail be available such as 5V to be able to drive the fet with 5V drive. Much better efficiency. To answer the question directly there are other controllers with ability to have a 5V bias for gate drive and with higher gate drive strength that would be a better choice. Based on your response I can give some suggestions.

Regards,
Mathew

0 Mathew Jacob1 over 6 years ago

TI__Expert 5900 points

Please check LM2745 and LM2748. Friendly with external bias. Operate at 300kHz and with the right fets this could be a viable solution.

Regards,
Mathew

0 Lawrence He over 6 years ago in reply to Mathew Jacob1

Genius 3280 points

Dear Mathew,

our client can not provide 5v bias voltage, have any other suggestion for our reference.

If any, Please advise me.

Thanks,

Best regards,

Lawrence.

0 Mathew Jacob1 over 6 years ago in reply to Lawrence He

TI__Expert 5900 points

If the customer has any specific Fets they want to use let me know, if not I will do a spreadsheet for this application with efficiency and they can check if its acceptable.

Regards,

Mathew

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TPS40040: TPS40040 inquire output spec 40A/2.8v