MP5475 MTP programming with only VDRV present

DC-DC Power Converters
1

Hi,

Can the MTP of the MP5475 be programmed through its I2C interface when only VDRV (+3.3V) is present (VINx = 0V) and EN input pin is low ?

Thank you,

Fred.

2

Hello Fred,

If VDRV is the only voltage present, the MTP cannot be written to. Please see the image from the MP5475 datasheet. The internal LDO has to be powered from Vin in order to write to MTP.

image
image888×595 61.8 KB

Best,

Ryan

3

Hello Ryan,

Thank you for the explanation.

With the MP5475GU-0000, if I keep the EN input low (with VINx and VDRV present),

  • will the 4 Bucks A,B,C,D stay OFF ?
  • can I program the MTP ?

The MP5475GU-0000 default VOUTs (1.1V / 1.1V / 1.1V / 1.8V) does not fit my need and I am looking for a way to reprogram the MTP when the MP5475GU-0000 is already soldered without having its ouputs delivering a voltage.

Best regards,

Fred.

4

Hello Fred,

Yes, with VIN present and VDRV present, but with EN low, you can program the MTP without turning on the 4 bucks within the PMIC.

Best,

Ryan

5

Thank you very much Ryan.