what is the minimum voltage of VIN1,VIN2and VIN3 for PF0100 PMIC

[johnwesley]

Hi all,

I am using PMIC PF0100 for IMX6 solo lite. I had little confusion about input voltage of LDO (VIN1), since in datasheet they have mentioned as 1.75 to 3.40.But in EVAL board of MCIMX6SLEVK I have found that they are giving voltage from BAT charger circuit. and made 3V15 form PMIC as DNP.

This is PMIC page in EVAL board where VIN1 connected with PF0100.

This is where PF0100 coming form BAT charger circuit output which is 4V325.

Could you please tell me how much voltage we have to give, or if I don't get voltage from BAT charging can I give voltage from output of switch regulators as in EVAL board?

Thanks in advance

John Wesley.

[pankajrana]

Hi johnwesley

Even I had this doubt, but now as I have the EVK with me , I can see that R51 and R53 are not mounted, whereas the R52 and R54 are present on board (solves the PMIC problem). And I believe, there is no doubt about Vin3.

Good observation, I must say. The schematics seems to be little misleading regarding the DNPs of this section, or may be this one is old revision.

Hello igorpadykov ,

I have an Sololite EVK with following stickers

"SCH-27452 REV B1"

"700-27452 REVC"

Some of the DNP components are present on the board. Is there any new schematics revision available for it, ?

Thanks.

--Pankaj Rana

[igorpadykov]

Hi Pankaj

please check attached : ENGR00240019

~igor

[pankajrana]

Thanks Igor.

I hope this will help johnwesley as well.

Regards,

Pankaj Rana

[johnwesley]

But as per the PMIC Datasheet

I think you misunderstood of my question. suppose if I am going to use power  from PF0100_VIN net it means 4.325V for all the LDO inputs.  whether it will affect the internal LDO in PMIC or not?

If it is affect internal LDO, what purpose VIN1, VIN2, VIN3 powered by PF0100_VIN (4.325V) voltage in evaluation board from freescale MCIMX6SLEVK.

[igorpadykov]

Sorry, I understood now, actually original question:

"minimum voltage of VIN1,VIN2and VIN3 for PF0100 PMIC"

should be formulated as "maximum voltage of VIN1,VIN2and VIN3 for PF0100 PMIC".

I think name "4.325V" on PF0100_VIN node is misleading

because MAX8903B is charger, not regulator. Its operation

is quite complex algorithm and it should work with

attached battery, also from datasheet p.16

If the battery voltage is below VSYSMIN, the charger does

not directly connect the system voltage to the battery

and the system voltage (VSYS) is slightly above VSYSMIN

(VSYSMIN is about 3V)

[igorpadykov]

Hi John

VIN1,2,3 min. values are given in MMPF0100 datasheet

sect.6.4.6.5LDO Specifications :

VIN1: 1.75V

VIN2:

2.8V                  if    1.8 V < VGEN4NOM < 2.5 V

VGEN5+0.25V if    2.6 V < VGEN4NOM < 3.3 V

VIN3:

2.8V                  if    1.8 V < VGEN5NOM < 2.5 V

VGEN5+0.25V if    2.6 V < VGEN5NOM < 3.3 V

Best regards

igor

[johnwesley]

Hi igor,

My question is in EVAL board of MCIMX6SLEVK I have found that they are giving voltage to VIN1,VIN2,VIN3 from BAT charger circuit which is mentioned in above schematic's as PF0100_VIN. and made 3V15 form PMIC as DNP.

So as of my knowledge they are giving input to VIN1,VIN2,VIN3 as PF0100_VIN I.e.., 4.325V as on above pics.

I want to know why they have given 4.325V to vin1...

Thanks in advance,

John Wesley.

[igorpadykov]

I think one can use both options, VIN1,2,3 were powered so

to not overload P3V15_VDDHIGH_SW2. Also these LDO have

less noise when powered directly from PF0100_VIN, they power

analog (camera, codec) chips.

~igor