LDC1314EVM: High current in shutdown mode

peter hull

Part Number: LDC1314EVM
Other Parts Discussed in Thread: LDC1314

Tool/software:

I have been using the LDC1314EVM for prototyping but I am seeing very high current in shutdown mode.

Power analyzer is showing ~1.8mA in shutdown, while the datasheet reports 200nA.

I have separated the TI microcontroller portion from the EVM and added a header to the LDC1314 portion. I was controlling the chip with an stm32 dev board and driving the SD pin with a GPIO and seeing high current in shutdown.

In an effort to remove as many variables as possible, I disconnected the stm32 and only connected 3.3V to Vdd and jumping the SD pin to Vdd, I am still seeing 1.8mA.

How can ensure the LDC is going into shutdown and/or lower shutdown current to the 200nA reported in the datasheet.

5 months ago

+1 Eddie LaCost 5 months ago

TI__Mastermind 43730 points

Hi Peter,

Looking at the schematic, there could be a couple other items drawing more current. Can you ensure that the oscillator is not running and maybe remove the pull up resistors in case they are drawing additional current as well?

0 peter hull 5 months ago in reply to Eddie LaCost

Prodigy 10 points

Thank you, I had underestimated the current draw of the clock, this was the source of the current draw in shutdown mode.

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LDC1314EVM: High current in shutdown mode