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LTM4620AEV help needed urgently

Question asked by ttay on Apr 5, 2018
Latest reply on Apr 18, 2018 by HAIHUA

our design has 4x LTM4620AEV and we used the design files (DC1759A) available on digi-key on our board design.

out of 8 outputs - 4 works, the other 4 not working

4 voltage regulators breakdown

  • U1
    1. VOUT1 - 0.6V - OK
    2. VOUT2 - 0.4V - OK
  •    U1_2
  1. VOUT1 - 1.8V - Not working
  2. VOUT2 - 2.3V - OK
  •    U1_3
    1. VOUT1 - 1.3V - Not working
    2. VOUT2 - 1.2V - Not working
  • U1_4
  1. VOUT1 - 1.0V - OK
  2. VOUT2 - 2.5V - Not working

 

4 working outputs - current rating is 0.2 amp

 

4 not working outputs

  • we removed the feedback resistor
  • input 12V to 1 voltage regulator, there is sound and current rating shows 0.5amp

 

Please help, thank you.

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