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LMR14020-Q1: Sleep Mode Quiescent Current

Aozpay
Prodigy 110 points
Part Number: LMR14020-Q1

Hello,

I want to use this component on my new design. When my circuit is sleep mode, total current will be about 1 mA but my processor will continue to work on sleep mode. So my processor will want current from SMPS about 1 mA. 

When ı look over datasheet, ı looked operating quiescent current for this product. About 40uA. But when ı read below title of sleep mode ı can not understand so much about operating quescent current. My questions is listed below.

  1. If my smps output is 5 volt - 1mA (My circuit's sleep current) how much current will be on smps input ? 
  2. If my smps output is 5 volt - 300mA ( According to datasheet, page 10) what will happen on smps ? Smps will enter sleep mode ? 

Best regards,

  • 0
    TI__Mastermind 34045 points

    Hi Aozpay,

    1. If my smps output is 5 volt - 1mA (My circuit's sleep current) how much current will be on smps input ?---------Depends on input voltage, it's about 0.5--1mA 
    2. If my smps output is 5 volt - 300mA ( According to datasheet, page 10) what will happen on smps ? Smps will enter sleep mode ?---------300mA threshold is for current peak, device normally enter sleep mode at load current below 100mA--150mA.

    B R

    Andy

  • 0 in reply to Andy Chen
    Prodigy 110 points

    Hi Andy,

    If smps enters sleep mode can ı take 5 volt on smps output  and can ı drive about 10 - 150 mA with 5 volt output ?

    Best Regards,

     

  • 0 in reply to Aozpay
    TI__Mastermind 34045 points

    Hi Aozpay,

    Yes, at sleep mode, converter is still monitoring output voltage and wake up to regulate output if it decrease 10-20mV lower than target.

    B R

    Andy