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TPS630250: Regarding TPS630250 no load condition

Part Number: TPS630250

Hi, 

This is for LED torch light application operated by battery. 

Device used : TPS630250

 This device is being designed for Constant voltage application with single LED with fixed voltage of 3.6V@1.6A current. During the testing even in the buck mode,  the o/p Voltage remains constant @3.6V but the   current varies drastically up to 2.5A. TPS630250 SCHEMATIC.pdf

IC no load current it self is reaching to 0.5 to 1Amp and as of now the Device is operating in the PFM mode (PWM pin = GND).

And also observed very high ripple in the output which is also causing the LED voltage to vary hence the Current.

Please go through the attached schematic and advise further to proceed. Thank you 

Regards,

Maruthi