LM25145: Parallel regulators to achieve higher output current

Hoa Ly

Prodigy 30 points

Part Number: LM25145
Other Parts Discussed in Thread: LM5140-Q1, LM25119,

Can I combined 4 of these regulators to give me a higher output current?

If so, any detailed designs that I should be pay special attention to?

Thanks

over 7 years ago

0 Arief Hernadi over 7 years ago

TI__Mastermind 23845 points

Are they going to be using the SYNCOUT function for interleaving or you will have your own signal to sync all of them together?
I will pass this along to our controller apps engineer

Thanks
-Arief

0 Timothy Hegarty over 7 years ago

TI__Guru 73072 points

Hoa,

What are the output voltage and current requirements for this design? One option may be the LM5140-Q1. Here is a relevant reference design: www.ti.com/.../PMP20440.

Regards,
Tim

0 Hoa Ly over 7 years ago in reply to Timothy Hegarty

Prodigy 30 points

28Vin, 22Vout and the current is ~40A

Thanks

0 Hoa Ly over 7 years ago in reply to Arief Hernadi

Prodigy 30 points

Hi,

I didnt use SYNCOUT function, I used this LTC6902CMS#PBF to generate clocks for SYNCINs

Thanks

0 Timothy Hegarty over 7 years ago in reply to Hoa Ly

TI__Guru 73072 points

Hoa,

A 2-phase solution with 20A per phase is feasible. Please consider the LM25119 or LM5140-Q1 current-mode controllers.

The LM25145 voltage-mode controller is also a possibility, you can review this content: e2e.ti.com/.../how-to-design-a-simple-two-phase-current-sharing-synchronous-buck-regulator-using-a-voltage-mode-controller. There is an Excel quickstart tool available for download here: www.ti.com/.../lm25145design-calc.

Regards,
Tim

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LM25145: Parallel regulators to achieve higher output current