TPS560430-Q1: Ability to withstand 40V load dump pulse

Preethi T

Part Number: TPS560430-Q1
Other Parts Discussed in Thread: LMR43610-Q1

As per the Datasheet recommended operating conditions, VIN Max is 36V only. Can you please confirm if this IC can withstand the 40V Load dump pulse?

over 3 years ago

0 Marshall_Beck over 3 years ago

TI__Mastermind 35210 points

Hello Preethi, The absmax specification is 38V for TPS560430-Q1, with this specification usually supporting most auto load dump profiles unless otherwise specified.

Typically, most auto oems I see clamp the battery voltage to 33V to allow for additional margin on the absmax.

I would confirm what their required absmax spec is.

If they need absmax to be >40V, then potentially, LMR43610-Q1 maybe a good fit with its absmax spec on Vin being 42V.

0 Preethi T over 3 years ago

Prodigy 20 points

Hello Marshal,

Thanks for your immediate response!

The absmax specification is actually 80V for the system. We have added a 39V zener before the input capacitor to cut down the voltage to <40V.

Please find the design below for your reference.

Regards,
Preethi

0 Marshall_Beck over 3 years ago in reply to Preethi T

TI__Mastermind 35210 points

Hello Preethi,

I think the customer will need to ensure the worst-case clamp voltage on Vin is below the absmax. The nominal clamp voltage of 39V right now exceeds this device absmax.

In addition I recommend:

1. Additional 2.2uF ceramic capacitor on Vin

0 Preethi T over 3 years ago in reply to Marshall_Beck

Prodigy 20 points

Hello Marshal,

Thank you so much for your support!

Regards,

Preethi

0 Marshall_Beck over 3 years ago in reply to Preethi T

TI__Mastermind 35210 points

You are welcome Preethi

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TPS560430-Q1: Ability to withstand 40V load dump pulse