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LSF0102: Vref-A and Vref-B, Power up sequence

Tamio Yokokura

Expert 3970 points

Part Number: LSF0102

LSF0102 support team

My customer is thinking using LSF0102 under the conditon of Vref_A = 1.8V and Vref_B = 3.3V like Figure 9 in the datasheet. And 1.8V rail is powered up after 3.3V rail is powered up.In this case, is the circuit as controlling EN pin to LOW needed until 1.8V rail is stabled? If YES, do you have the recommended circuit?

Thanks

Tamio

over 6 years ago

0 Dylan Hubbard over 6 years ago

TI__Mastermind 46305 points

Hey Tamio,

There is no power supply sequencing requirements for this device and the EN pin doesn't need to be held low.

Please refer to the LSF training videos below for more details on operation of the devices:

https://training.ti.com/introduction-voltage-level-translation-lsf-family?cu=1134826

0 Tamio Yokokura over 6 years ago in reply to Dylan Hubbard

TI__Expert 3970 points

Hi, Dylan

Thank you for your reply.

Tamio

0 ShreyasRao over 6 years ago

TI__Guru 62500 points

Hi Tamio,

do you have any more information on the customer use case for this?

There is the AXC family which have been tested for its robust power sequencing without any unintended glitches.

please refer to the app note on it here below:

www.ti.com/.../scea058a.pdf