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Startup issue ADP5090

Question asked by MInspiro on Apr 18, 2016
Latest reply on May 20, 2016 by Kevin.Yao

Hello all,

 

I'm having an issue with the ADP5090 startup sequence with some of my PCB's. Some of our PCB's came back not working. I use the ADP5090 to charge and manage a small 25 mAh Lithium polymer battery and use RFID Vout to as Vin for the ADP5090. This works fine on most of the PCB's but some the ADP5090 never achieves a stable SYS voltage as shown in the measurement below:

 

DS1Z_QuickPrint4.png

Note: Voltages are a bit higher than in real life due to max setting on scope.

 

More zoomed in on the issue. SYS reaches a good voltage but than collapses back to the End of Cold-Start Operation Threshold.

 

DS1Z_QuickPrint6.png

 

This is the schematic used:

 

Schematic ADP5090.PNG

 

Hope anyone can point me in the right direction of this issue.

 

Thanks,

 

Michael

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