Tool/software:
Hi All,
I am using the TPS62130A-Q1 PMIC to power a 1.1V chip. I would like to have a voltage configuration option for this PMIC using a digital potentiometer.
The equation below can be used to calculate the output voltage of the PMIC. I am looking for an absolute accuracy of 0.5mV from the configured voltage. This means that if I configure the voltage to 1.04V, then the actual output voltage should be (1.04 +/- 0.005).
For my use case, I need the output voltage range to be from 1.04V to 1.21V.
The voltage at the feedback pin is 0.8V, and if R1 and R2 are ideal resistors, the output voltage will depend on the accuracy of the voltage that is expected at 0.8V. Is there a parameter in the datasheet that describes this 0.8V voltage? What will be the deviation in 0.8V that is expected at feedback pin?
A digital potentiometer will be used instead of R1 and R2. The step size of the PMICs output voltages is directly dependent on the total number of taps in the digital potentiometer. There is a digital potentiometer with total number of taps i.e., 1024 (AD5292SRUZ-20-EP) [www.mouser.in/.../AD5292SRUZ-20-EP
With this a step size of 1mV is possible. How will the accuracy of digital potentiometer affect the PMIC output voltage?
Tolerance Of Potentiometer = 1%
INL = +/- 0.5 LSB
DNL = +/- 0.5 LSB
Is there anything else that I have to consider?
