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LP2996A: LP2996 USING PROBLEM

Part Number: LP2996A

Dear all,

One of my customer met a problem when using LP2996 in his desigin. He wants to replace lp2996M with  lp2996A,and  found a big difference between them .LP2996A has a pad thermal connection in the back of the  IC,but LP2996M has no.The PCB has no relevant design about thermal pad,can it be replaced directly??or should be redesign the PCB?? Looking forward to your reply!!!Many thanks!!!