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LP87702-Q1: LP87702 input 5V,the twobucks can not work

Part Number: LP87702-Q1
Other Parts Discussed in Thread: LP87702

 when LP87702 input is 5V,the two bucks have no output,why?

  LP87702:VANA=VIN1=VIN2=EN1=NRST=5V。

but VANA=VIN1=VIN2=EN1=NRST=4.2V,the two bucks can work。