TPS65320D-Q1: Lower current output about efficiency

Good Morning Lawrence,

What operating value are you needing?

Kind regards,

Conner Gillette

Hi, Support Team

I would like to know the efficiency in converting 

Kind regards,

I am working on calculating the efficiency with the parameters you've designated above and will have an answer for you by end of tomorrow.

Kind regards,

Conner Gillette

With an input quiescent current of 470uA, and your output current being 7uA, the efficiency would be very low for this use case. What is your use case for this part, I might be able to help you find a suitable alternative.

Kind regards,

Conner Gillette

Hi Conner,

The system, in Sleep mode, shuts down all ICs except the Deserializer, and the overall power consumption should be less than 100uW. The Deserializer's power consumption in sleep mode is 34.2uA (1.8V) and 7uA (3.3V) respectively.

Thanks

Hi, Conner

so our client point is in sleep mode, the power ic spec is

Vin=12V

Vout=3.3V

Iout=0.000007A

Fixed frequency PWM control

and we know the efficiency would be very low for this case. Could share TPS65320D-Q1 of efficiency in converting?

if any, Please advise me.

Thanks,

Best regards,

Lawrence

I will have to obtain an EVM and measure the efficiency myself. I will update you early next week with progress.

Kind regards,

Conner Gillette

I have ordered an EVM to complete the efficiency measurements myself. Once it is in hand, I will complete the measurements and report back to you.

Kind regards,

Conner Gillette

Hi Lawrence,

I do not think an EVM efficiency measurement with a 7uA output is going to provide any new understanding since the efficiency calculation should be straightforward (VOUT*IOUT / VIN*IIN) and since the input quiescent current is very high compared to the output load, the efficiency will not be good. 

I will go ahead and close this thread unless there is something else needed.

Best regards,

Matt