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LMZ21700: Super Cap Charging

Part Number: LMZ21700

Dear Friends-

We are attempting to use the LMZ21700 in our application to charge a super cap. We believe the super cap is being charged effectively using the LMZ21700. When prime power is removed from the application circuit, it appears the super cap is discharging thru the LMZ21700. That is, back-feeding thru the LMZ21700 when prime power is removed. Is this expected behavior? 

Thank you, 

Nick