LM5155-Q1: LM5155-Q1, UVLO/SYNC/EN pin

Aparna Vashishtha

Part Number: LM5155-Q1

Tool/software:

Hi,

I want to use this LM5155-Q1 IC as a pre boost solution, but I am able to understand the functioning of the pin UVLO/SYNC/EN.

In my application, I want to use SYNC, EN & UVLO functionality all together.

can I use all the functionalities via single pin UVLO/SYNC/EN only and if we can use then HOW??

thanks

Aparna

0 Moritz 9 months ago

Hi Aparna,

Thanks for reaching out.

Did you have a look at the datasheet in chapter 9.3.5?

If anything is unclear please feel free to ask.

Best regards

Moritz

0 Aparna Vashishtha 9 months ago in reply to Moritz

Yes, I checked but my confusion is between UVLO and EN functionality.

Are both terms are same, if same then iwe can use this pin as the EN of IC to turn on the IC?

and if not same, then How will turn on the IC?

0 Moritz 9 months ago in reply to Aparna Vashishtha

Hi Aparna,

The IC in enabled when the voltage at EN pin is above the Vuvlo rising threshold.

UVLO feature means that you can have a different turn on and turn off voltage when you are using a resistor divider at this pin (hysteresis of 0.05V)

So it is a difference.

To turn on the IC -- bring the voltage above 1.5V at EN pin.

To implement all features including UVLO and SYNC, refer to the datasheet:

Best regards

Moritz

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