TPS7B7702-Q1: OUT1 works like load switch

Mona Guo

Prodigy 610 points

Part Number: TPS7B7702-Q1

Hi, team

1. can you check the circuit below to see why the OUT1 works like a load switch instead of LDO?

2. OUT1 works from 12V to 11.9V, will there any problem when working under this situation?

over 2 years ago

0 Srikanth Lolla Venkata over 2 years ago

TI__Genius 12040 points

Hello,

I am looking into this, I will get back to you by the end of the day tomorrow. Thanks!

Regards,

Srikanth

0 Srikanth Lolla Venkata over 2 years ago in reply to Srikanth Lolla Venkata

TI__Genius 12040 points

Hello,

Could you confirm the value of R1107 (is it ~75KOhm)? From the labelling in the diagram, it appears like you are expecting 12V at OUT1 and providing 12V at IN. Is this true? If so, and if R1107 is ~75KOhms, then the OUT1 is acting like an LDO and not as a load switch. If you are trying to drive a load current through OUT1, then you will need some additional dropout (Vin - Vout, hence slightly larger Vin) to maintain regulation of 12V at OUT1. Thanks!

Regards,

Srikanth

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TPS7B7702-Q1: OUT1 works like load switch