LMR60440-Q1: expected Vout

Makoto Oka

Prodigy 580 points

Part Number: LMR60440-Q1

Tool/software:

With LMR60440-Q1,

VIN=10V
Vout=12V (setting)
Iout=1.5A (image with system power consumption of 15W)

In this case, can you see how much V Vout is likely to be?

2 months ago

0 Niranjan Nair 2 months ago

TI__Genius 12160 points

It will depend on the exact configuration but it should be slightly less than Vin, so around 8.5-9.5V can be expected.

0 Makoto Oka 2 months ago in reply to Niranjan Nair

TI__Prodigy 580 points

Hi Niranjan,

Can we calculate and estimate the Vout drop in advance? Simulation is also enough.

0 Niranjan Nair 2 months ago in reply to Makoto Oka

TI__Genius 12160 points

Hi,

If you could get the frequency they plan to operate it at, I can give an estimate. It would also depend on the inductor DCR but we can take a typical value.

Regards,

Niranjan

0 Shuhei Goto 2 months ago in reply to Niranjan Nair

TI__Expert 5560 points

Hi Niranjan,

Could you please calculate for the case that fSW is 1MHz or 2MHz?

Best regards,
Goto

0 Niranjan Nair 2 months ago in reply to Shuhei Goto

TI__Genius 12160 points

Hi Goto,

Actually the average frequency will reduce once dropout starts, so it should not vary much for 1MHz or 2MHz. An estimate I have is around 9.2V assuming frequency reduces to ~200 kHz, the minimum frequency. However, this is just a theoretical estimate and should only be taken as such.

Regards,

Niranjan

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LMR60440-Q1: expected Vout