MMPF0100NPEP main input supply voltage Vin

[markpascarelli]

Can the MMPF0100NPEP main input supply voltage (Vin) be less than the switching regulators SW1AIN, SW1BIN, etc?

I would like to use the KITPFPGMEVME Programmer while my board is powered by the programmer (3.3V) or by my board's 4.2V DC/DC converter.

By placing two or-ing diodes from programmer 3.3V and external 4.2V the PMIC can be programmed with system power off or on.

Thank You,

Mark Pascarelli

[Yuri]

Hello,

Please take into account some minimal voltage drop between input and output voltages

for buck switching regulator.

"What is the minimum VIN voltage to maintain a stable 3.15V on SW2 of the PF0100 PMIC?"

https://community.freescale.com/message/387096#387096

Have a great day,
Yuri

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[markpascarelli]

I am meeting the voltage drops for the input to output requirements.

VIN1 = 3.3V for 1.5V and 1.5V out

VIN2 = 3.3V for 1.8V and 2.5V out

VIN3 = 4.2V for 2.8V and 3.3V out

SW1AIN, SW1BIN, SW1CIN, SW2IN, SW3AIN, SW3BIN, SW4IN, SWBSTIN = 4.2V for 1.375V, 1.375V, 3.3V, 1.35V, 1.2V and 5V outputs respectively.

System VIN (pin 50) = 3.9V

My question is;

Can System VIN be < all other VIN's

Thanks,

Mark

[Yuri · Accepted solution]

Hello,

  The system VIN  is used to supply PMIC core, and there are no restrictions regarding

other voltages.

Regards,

Yuri.