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ADM3260: separate voltages for VIN and VDDP

Question asked by yellowsky on Mar 26, 2018
Latest reply on Mar 29, 2018 by jnaso

Hi,

 

We plan to use the ADM3260 on a module. The module will be used in 3.3V, 5V and 3.3/5 mixed setups.

 

The module hosting the ADM3260 breaks out VIN, GND, VDDP (& PDIS, SCL, SDA). Users of the module need to be able to power VIN and VDDP by separate power rails from the motherboard. Both VIN and VDDP need to accept 3.3V-5V independently.

 

  • VIN can be 3.3V - 5.0V
  • VDDP is on a separate rail and can also be 3.3V - 5V
  • VISO is set to 3.9V via VSEL
  • VDDISO is powered from VISO @ 3.9V 
  • PDIS used by the motherboard/user for power management ( a transistor on the module will also shut down VDDP) 

 

For our module, all voltages 3.3-5V are valid, but here are the extremes:

 

  • VIN = 5.0V & VDDP = 3.3V
  • VIN = 5.0V & VDDP = 5.0V
  • VIN = 3.3V & VDDP = 3.3V
  • VIN = 3.3V & VDDP = 5V (unlikely)

 

Can the iCoupler handle the voltage differences VDDPISO (3.9V)? Do you see any problem with this setup? I don't seem to be able to work out all of the details from the datasheet... any help greatly appreciated. 

 

Thanks,

Patrick

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