TPS61251: Boost IC for wireless charging project

Hi Aurora,

Thanks for suggesting TPS55340 IC. The current rating of the IC is ok; however, we may have to operate at 40V, which is the maximum output voltage TPS55340 can provide. Is there any other IC that can provide some margin while operating at 40V.

Regards

Hi Stefan,

The requirement is to design a boost converter for my wireless charging project (system requirement is provided below) that requires constant input from an USB-PD adapter and provides variable output. As per the suggestion from Aurora, I checked TPS55340 IC datasheet. It can provide output voltage up to 40V, but I may have to operate my system at 40V. Thus, wanted to confirm if any other integrated FET boost converted IC is available that can provide some margin when operated at 40V output voltage.

The system requirements are listed below.

Input voltage- Typically 20V (However, the input can be within the range of 5V-20V as it comes from USB-PD adaptor)

Maximum input current- 3A

Output voltage- 20V to 40V.

Maximum output current- 3A

Output power- 60W

Control of desired output voltage from boost converter should be provided from an external microcontroller using duty cycle control of PWM.

With Regards

Vivek

Hi Stefan,

I was just checking the IC specification on TI website and there it was mentioned that the suggested IC (TPS55340) can support output voltage upto 38V. I am attaching screenshot of the website for your reference. Can you please clarify this or suggest some other integrated FET boost IC that can go upto 40 V?

Regards

Vivek

Hi Vivek,

the TPS55340 has an abs max rating of 38V but based on your spec you need 40V. So this will not fit.

I also do not think that a power stage can handle 5V input to 40V output with 3A output power. This will give an input current of 24A.

So I recommend to go for external MOSFET solution.

Also not sure if I understand your requirement right:

VOUT max 40V

IOUT max 3A

This will be 120W but you only need 60W ?

Best regards,

 Stefan