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TPS3808G01DBVEVM: TPS3808G01QDBVRQ1 change the Rsense to a higher resistance

user6279519
Prodigy 40 points
Part Number: TPS3808G01DBVEVM
Other Parts Discussed in Thread: TPS3808

We would like to change the Rsense to a higher resistance as below to decrease the current consumption, could you please help check if it is workable or is there any risk?

R2260 => 1.8Mohm

R2261 => 140kohm

R4330 => 1.8k

3.5~16V input and the resistance is 1.8M +0.14M+0.0018M=1.9418M

The current will be 3.5V~16V  /1.9418=1.80uA ~8.23uA .The leakage in ISENSE pin is 25nA. Could you help check is there any risk?

A further question: What is the acceptable range we can increase the resistance?

  • 0
    TI__Genius 9375 points

    Hi user,

    For context, this app note is very helpful for dividing down the resistors, especially on the TPS3808. As you use larger and larger resistors, there is a tradeoff between Iq and accuracy. I believe that your resistors would be in an acceptable range though. You can see the tradeoff in this graph:

    Thanks,
    Abhinav.