ADP3339 minimum input power and tolerance

Hi Peter,

The part was not characterized at input voltages lower than 2.8V and there's no guarantee that the specifications in the datasheet can be met at these conditions without doing additional testing. May I know what your output voltage and load conditions are? Another issue that you might see with lower input voltages is that you might not have enough headroom to regulate the output voltage, hence, the PSRR performance of the part would degrade.

Let me know if you really need to operate at 2.48V, I could run some more tests in the lab to check regulation/vout accuracy and Iq on several parts, although this might take a while to complete.

Best regards,

Jess

Jess,

Here's our HW engineer's response to your question and his comments:

in summary, we are using the ADP3339 to provide the 1.8V rails for the AD9788. Unfortunately for us we are using the 2.5V (or 2.48V) rail to provide for the LDOs.

so according with the AD9788 datasheet:

DVDD18

Pmax = 1250 mW

V = 1.8V;

hence Imax = 700 mA;

CVDD18

Pmax = 110 mW

V = 1.8V;

hence  Imax = 62 mA;

As I mentioned we are using a ADP3339  (max. 1500 mA) for each rail

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It would be great if you can conduct further test to characterize the lower Power input (2.48V) and impact. We understand that this will require time but we are eager to hear some feedback from the manufacturer.

Thank you for your support.

Peter

Jess, I haven't received any follow up response to my request. Is it possible for ADI to test a few devices to help characterizing the device performance at 2.48V or lower?

Thanks.

Peter