LP5036: Discrepancy in the power save mode IQ data of datasheet and EVM board results

Bhargav Krishnan

Part Number: LP5036
Other Parts Discussed in Thread: USB2ANY

Hi,

The low power mode IQ for LP5036 is given in datasheet as 6uA for typical case. I wanted to test this power save mode IQ on TI's EVM board.

To test this parameter , I did the following.

1. Set all the register values to 0.

2. Set the power save mode bit (D4 bit of 01h register) to 1.

3. Have put an ammeter between the VIN_EXT and GND.

With above setting, if I look at ammeter reading, I am getting ~170uA of current.

Could you please let me know why there is a discrepancy in the board and datasheet results and if I am missing something? Thanks for your help.

Best Regards,

Bhargav

over 5 years ago

0 Hardy Wu over 5 years ago

TI__Genius 12915 points

Hi Bhargav,

This 170uA you tested includes the current of I2C interface. To test only current of VCC, you need to separate the supply of VCC and VMCU. In EVM, you need to remove the jumper of J2 (disconnect VLED and VMCU) and supply another power to VMCU. Then you can test the power save mode IQ through ammeter at VIN_EXT.

0 Bhargav Krishnan over 5 years ago in reply to Hardy Wu

Prodigy 120 points

Hi Hardy Wu,

Thanks for the clarification. Does that mean the USB2ANY device is taking up the extra current?

Best Regards,

Bhargav

0 Hardy Wu over 5 years ago in reply to Bhargav Krishnan

TI__Genius 12915 points

Hi Bhargav,

Yes VMCU on EVM took extra current, which was USB2ANY if you used the EVM board.

0 Bhargav Krishnan over 5 years ago in reply to Hardy Wu

Prodigy 120 points

Thanks for the reponse Hardy Wu, that helped.

Best Regards,

Bhargav

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LP5036: Discrepancy in the power save mode IQ data of datasheet and EVM board results