Hello,

First of all, which company's ICs should I look at, Texas or Analog?

I want to design a synchronous buck converter to deliver 5.1 VDC at 3 A maximum to a Raspberry Pi 4 B via a USB-A port.

My power source is 24VDC from a power supply at 230VAC to 24VDC.

My first choice is the LMS3655 and the second is the TPS54538. But what is the best to have big switching frequency or small?

I already designed with webench but i am not sure about my choice.

Thanks

 

Of those 2 I'd marginally opt for the TPS54538. Why?

In no specific order.....
1. Simpler functionality, no unnecessary complexity
2. Slightly lower component count
3. Higher frequency -> smaller/cheaper inductor (6.5mm sq/£2.95 v 10.5mm sq/£3.20)
4. Cheaper part (£2 v £5)
5. Newer device (2024 v 2018)
6. Smaller part, fewer pins (9 v 22)

 

Hello,

First of all, which company's ICs should I look at, Texas or Analog?

I want to design a synchronous buck converter to deliver 5.1 VDC at 3 A maximum to a Raspberry Pi 4 B via a USB-A port.

My power source is 24VDC from a power supply at 230VAC to 24VDC.

My first choice is the LMS3655 and the second is the TPS54538. But what is the best to have big switching frequency or small?

I already designed with webench but i am not sure about my choice.

Thanks

Whatever company you choose, make sure your ICs are original, not knock-offs.

 

Whatever company you choose, make sure your ICs are original, not knock-offs.

Of course not! I would be crazy!

Finally, I found the best option LM61460, but how to deliver 5.1V to a USB-A? What extra do I need for this?

 

Of course not! I would be crazy!

Finally, I found the best option LM61460, but how to deliver 5.1V to a USB-A? What extra do I need for this?

To deliver 5.1 V reliably to a USB-A port, add overcurrent limit, inrush limiter and output filtering.

 

LM61460

What does it give you over the others then?