TPS4H160-Q1: how to measure Rds(on) and leakage current

Hi Polly,

Thanks for reaching out on E2E!

To calculate the Rdson, you can setup your EVM similar to the load switch example below:

By attaching a load to the output and a voltage source to the input, you can calculate the

Rdson = (Vout – Vsource) / Iload

Following the conditions listed in the second column of the table below, located on page 7 of the datasheet, you should get values consistent with the values in the third column of the table below:

Since there are multiple conditions for leakage currents, I’ll explain how to calculate the output leakage current in off-state.

To calculate this leakage current, follow the conditions listed in the second column of the table below, located on page 7 of the datasheet and measure the output current. The output should be consistent with the values in the third column of the table below:

Best Regards,

Elizabeth

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Hi Elizabeth,

Thanks for your reply.

• According to the figure and the formula, Rdson = (Vout – Vsource) / Iload,should I get a accurate Iload value from measuring the voltageof  Vout sensing resistor?

• About Leakage Current, could you give me the diagram about  measurement?
• Should I put Load in this case?
• Cause RDS(off) is so high, i think using Voltmeter is not much accurate that way

Isaac,

The current flowing into the device is the same as the current flowing out of the device. To measure the current through the load (Iload), attach an ammeter to the input and the measured amount is your Iload.

To measure the leakage current in the off state, it doesn’t matter if you have a load attached or not. Simply set Vinx = Vdiag_en = Voutx = 0, supply a voltage such as 13.5V to Vvs, and attach an ammeter to the input to observe the amount of leakage current in the off state.

Best Regards,

Elizabeth

Please click "This resolved my issue" button if this post answers your question.