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LMQ644A2-Q1: output current

Part Number: LMQ644A2-Q1

Tool/software:

hi expert,

my customer use two LMQ644A2, VIN =12V Vin max =36V , Vout=3.3V Iout max= 20A.

but when they test the total output current just  up to 5A, the output voltage is 0V. 

could you help review the schematic for LMQ644A2-Q1.

LMQ644A2.pdf