Hello Devipriya,

Thanks for reaching out to us via e2e.

Let's do a quick rough calculation:
When the output voltage is 4x the input voltage, the average input current will be 4x the load current.
The peak current will be about 30% higher than the average current.
Plus some adder for efficiency losses and component tolerances (maybe 20% overall).

1.7 * 4 * 1.3 * 1.2 = 10.6A peak current for the (integrated) low side FET.

The TPS55332-Q1 is rated at 5.7A, but also the newer LM5157 can only handle 7.5A as a maximum.

So, I am afraid that none of our converters with integrated FET can handle the required current.

Please have a look at our controllers with external FET instead, like e.g. the LM5155 / 56.

Best regards
Harry

Hello Devipriya,

The LM5156 is the industrial version of this device.

For automotive applications, please use the Q1 variant:
www.ti.com/.../LM5156-Q1

Best regards
Harry