LMZ12003: Minimum input voltage for 5V output

Frank Ambrosius

Prodigy 120 points

Other Parts Discussed in Thread: LMZ12003

I'm designing a battery powered application where the input voltage will be between 5.5V and 14V.

Can I use the LMZ12003 to generate a stable 5V or will I need a higher input voltage?

Thanks!

Frank

over 9 years ago

0 Denislav Petkov over 9 years ago

TI__Mastermind 18940 points

Hello Frank,

At 5.5Vin you will not be able to get 5Vout at full load. You will get close at light load. The part will reach maximum duty cycle. The dropout voltage really depends on the switching frequency you pick and your load current. Lower frequency is better. Lower current is also better.

I am attaching a quick spreadsheet calculator to give you an idea. You can use it to estimate the drop out voltage.

estimated_dropout_voltage_LMZ12003.xlsx

Regards,

Denislav

0 Frank Ambrosius over 9 years ago in reply to Denislav Petkov

Prodigy 120 points

Hi Denislav,

Thank you for the clear answer.

Regards,

Frank

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LMZ12003: Minimum input voltage for 5V output