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LM66100: shut down or leakage current??

Nam, Dino
Expert 6445 points
Part Number: LM66100
Other Parts Discussed in Thread: TPS22916

Dear team, 

My customer would like to use below concept. Their main concern is current consumption of battery < 1uA. Please review below concept and let me know your opinion. 

<Case 1> normal operation. no load

1. VIN1 : 3.3V system volage 

2. VIN2 : 2.5V battery voltage 

At above condition, upper LM66100 is turn on, lower LM66100 is turn off due to CE voltage. is it right? 

In case of this configuration, what is current consumption of VIN2 battery? 0.3uA(red box, shutdown current) or 2.1uA(green box, leakage current)? 

<case 2> system voltage lost , no load 

1. VIN1 : 0V system volage 

2. VIN2 : 2.5V battery voltage 

At above condition, upper LM66100 is turn off, lower LM66100 is turn on due to CE voltage. is it right? 

In case of this configuration, what is current consumption of VIN2 battery? 0.3uA(Red box) or 5.1uA(Green box) or 5.4uA(SUM)? 

If the current consumption is over 1uA under both case, the customer can't use this concept. Is there any recommend concept to satisfy customer requirement? 

Thank you. 

  • 0
    TI__Expert 6445 points

    Dear team, 

    Is there any feedback on this request? Please review it and let me know your opinion. 

    Thank you. 

  • 0 in reply to Nam, Dino
    TI__Prodigy 580 points

    Hey Nam,

    For case 1, You will have a current consumption of 0.3uA.

    For case 2, Vin1 should be between 1.5V and 5.5V. Setting Vin1 to 0V would be outside recommended operating conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime. If Vin1 is set to at least 1.5V then it would be 0.3uA+Load Current

    Those answers are based on having no source on the output. In case there is, the maximum current would be the Iout highlighted in green.

    I hope this helps.

    Thanks,

    Sam

  • 0 in reply to Sam Isaac
    TI__Expert 6445 points

    Hello Sam,

    Thank you for your comment. 

    For clarify, Under below concept. 

    When VIN1= 1.5V, VIN2 = 3.0V then VOUT is VIN2 =3.0V , The current consumption of VIN2 is max 5.1uA without load current due to form VIN2 to VIN1 leakage current. Is it right? 

    If yes, the customer can't this solution. Is there any concept or device to reduce the current consumption of VIN2 to below 1uA? 

    Thank you.  

  • +1 in reply to Nam, Dino
    TI__Prodigy 580 points

    Hey Nam,

    That's correct. In this case, I would suggest to have two TPS22916 devices and then have a comparator before them to decide which switch to turn on. This way it would reduce the current on Vin2.

    Thanks,

    Sam