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Efficiency of ADP1607 at 32 uA

Hello,

My name is Meir and I am a DFAE in ADI team at Phoenix Technologies Israel.

Meprolight, one of our customers, is interested in ADP1607 for battery powered application.

Their Input voltage range is: 0.8V-3.3V

Output: 2.5V and 3.3V (depending on operational mode)

Load Current: 32uA-10mA/20mA

Important for them to achieve higher efficiensy at following currents: 32uA, 10mA and 20mA.

From Figures 3, 4 and 5 we can't see this parameter.

Please advise what will be a efficiency at above listed currents?

Thanks,

Meir

  • Hello Meir,

    Below are graphs that show efficiency down to 10uA for the ADP1607ACPZN-R7 Auto Mode part.

    Let me know if you need any additional information or clarification.

    Thanks,

    Lauren

  • Hello Lauren,

    Thanks for response.

    Is these graphs refer to efficiency at PWM or PFM switching Mode for light load?

    Is the PFM switching Mode improves the efficiency? Please advise if they are additional graphs for PFM mode?

    Please advise if they are ADI Boost DC-DC devices that can achieve better efficiency at lower currents at 35uA to 10mA with Vin=0.8V-3.3V and Vout=3.3V.

    Maybe something is soon to be released in 3-6 month?

    Best Regards,

    Meir

  • Hello Lauren,

    In addition, I can't find in data sheet the details about condition while the input voltage is from 2.5V to 3V and Output voltage is: 2.5V.

    Please advise if the ADP1607 may convert the Input voltage range of (2.5V -3V) to 2.5V output voltage?

    Thanks,

    Meir

  • Hi Meir,

    The graphs provided are for a part that is Auto mode. Auto means that the part will automatically transition between PFM at light loads and PWM at heavy loads to maintain the highest possible efficiency. At the low currents in your application, the part will be in PFM mode.

    In the Specifications table for the ADP1607 it lists the VIN range as 0.8V to VOUT. This means that VIN can never be greater than VOUT. The ADP1607 does not have a pass through mode and the architecture does not support situations where VIN > VOUT.

    The ADP1607 is the only part that works down to VIN=0.8V and we don't have anything that would be a better fit in the pipeline. The ADP1607 would be a good fit for the VOUT = 3.3V portion of your application. To use the ADP1607 in the VOUT = 2.5V portion of your application, you would have to reduce the maximum input voltage to 2.5V through diodes or a cascode FET. This would cause additional power loss and decrease the efficiency.

    Let me know if you have further questions.

    Thanks,

    Lauren

  • Hi Lauren,

    Thanks for response. My customer ordered eval. board (ADP1607-EVALZ ) and after engineering experiments he decided to use this device in a new design.

    He also requested a Evaluation board design files: schematic, layout and BOM.

    In addition he requested a footprint layout the ADP1607.

    He is working with ALTIUM tool, but he also may open a BRD files. 

    Could you please send me a above mentioned design files in ALTIUM and BRD formats?

    I downloaded a BXL file from ADI site, transferred it into BRD and ALTIUM formats by using ULTRARABRERIAN tool, but unfortunately we didn't succeed open them.

    Thanks,

    Meir

  • Hi Meir,

    Analog only provides ADI part footprints in different schematic and layout programs. We typically do not provide whole layout files.

    Were you able to complete all the steps in the readme document you exported the files for Altium? It appears that you need to do some extra steps in order to have it work properly.

    Unfortunately I am not familiar with Altium, so I am unable to provide additional support for that tool.

    Thanks,

    Lauren