LMR60430-Q1: Texas_Instruments_LMR604305SRAKRQ1

Hi Vinyas,

Can you give some more information about the application so I can make sure the schematic is designed correctly.

VIN, VOUT, FSW, Load, mode of operation, inductor part number, etc.

Thanks,

Dino

Sure Dino

This is for a Automotive Application.We are using this as our primary buck which is turning up our microcontroller.The PGOOD is going in as a hard RESET to our micro, which makes it critical for our application.

VIN=Battery Voltage from vehicle-Range is from 8V to 16V

VOUT=5V Fixed(Using fixed variant from TI)

FSW=400KHz(want for better EMC performance as it is our main buck)

LOADs include microcontroller and other peripherals which in worst case source a current of around of 2.6A rms

Inductor Part number:LCXND6060YEL100MMG

IC is being used in FPWM mode

You can refer to attached PPT for more info

HI Vinyas,

Schematic around the IC looks good, have question about EMI filter.

What size inductor is the customer using? I do not see an inductance value on the schematic.

Layout looks mostly good, please rotate around C63038 and 63067 so that the VIN terminal of C63038 is as close as it can be to the VIN pin.

Thanks,

Dino

Thanks for the review Dino

L63004 is 6.8uH-Input filter inductor

L63006 is 10uH( 6*6 size)-output inductor

Hi Dino

Thanks for the quick reply

I also had a follow up question.

NOTE: Current circuit Changed to AUTO MODE 

I have a requirement to meet the sleep current requirement.

Can you please provide the efficiency curve for lower load currents of around 100uA to 200uA as the below snippet is only till 1mA.

To meet the sleep current requirement as it has better efficiency at lower load currents I have changed the design to AUTO MODE by keeping the other circuit same

Hi Vinyas,

Talking with our team to see if we have this data. Will get back to you soon.

Thanks,

Dino

Hi Dino, Any update on the data?

Hey Vinyas,

Have some 3.3VOUT data, would this work for you?

Thanks,

Dino

I would need 5V Fixed -LMR604305SRAKRQ1 as I will have to prove my design.

But until then please provide 3V3 Fixed data, will temporarily use that data in my calculations until you provide data for the 5V Fixed

Thanks Dino,

Would it be similar for 5V Out as well?