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MPC5744 power supply

Question asked by Hanson He Employee on Mar 12, 2019
Latest reply on Mar 12, 2019 by Peter Vlna

Hello,

 

There is a question about 5744 power supply, the specific situation is like this, now use DCDC to provide 3.3V voltage to 5744, use 5744 internal PMU module combined with transistor to provide 1.25V, at this time 5744 can not start, change the PMU power supply mode to LDO to provide 1.25V, the system can be used normally; at the time of testing, found that 3.3V if use DCDC power supply, there are many problems in the way. I would like to ask how many customers choose DCDC or LDO or use internal PMU module when this IC is powered.

 

Is the sequence of power start-up caused by it?

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