LMS1585A: Design Review

sonali zodage

Part Number: LMS1585A

Hi,

We are using LMS1585AIS-3.3/NOPB converter in one of our design. I have attached an schematic for this converter which we have design. Please review the schematic and provide your feedback.

over 3 years ago

0 Juliette over 3 years ago

TI__Mastermind 18466 points

Hey Sonali,

Your circuit looks correct.

However, because the datasheet specifies polarized capacitors, it makes me think that this part may need a minimum ESR to be stable.

There is no mention of it in the datasheet but it may be a safe choice to include a space for a small resistor to compensate for ESR (usually in the mOhm range) or to use an electrolytic capacitor instead of a ceramic one.

If you want to stick with that specific package, it may be best to switch to a part that has more documentation.

LM3540

LP38690 or LP38692

Best,

Juliette

0 Juliette over 3 years ago in reply to Juliette

TI__Mastermind 18466 points

wait is current flowing into the output pin?

0 sonali zodage over 3 years ago in reply to Juliette

Intellectual 375 points

Hello Juliette,

In our application we can not use tantalum or aluminium capacitor.

Thanks,

Sonali

0 sonali zodage over 3 years ago in reply to Juliette

Intellectual 375 points

Hello Juliette,

Right now the output current is approx 500mA.

Current on 3V3 suuply can increase to 1A as our full application design is not final yet

Thanks,

Sonali

0 Juliette over 3 years ago in reply to sonali zodage

TI__Mastermind 18466 points

Hey Sonali,

The part can support those loads.

My question was is the current coming from an outside source and being fed into the input of the LDO?

Best,

Juliette

Power management

Power management forum

LMS1585A: Design Review