Regarding efficiency of MC34PF3000A7EP PMIC

[arvapallykumara]

Hello, We are doing the thermal analysis of i.MX6UL board by using MC34PF3000A7EP chip. For this we need efficiencies of linear and switching regulators available in PMIC. However we found that detailed efficiencies for the switcher and LDO's are not given in to their respective electrical characteristics section (attached the datasheet of PMIC). We want it for the calculation of overall power dissipation of the PMIC. Do let us know how to move ahead with this or you have a excel sheet wherein these thermal calculation are already done.

Thank you,

Regards,

Kumaraswamy.

[guoweisun]

Actually we don't provide all the detail efficiency curves for your reference because of the complex permutation and combination in VIN,VOUT,IOUT.

For your question you need calculate of overall power dissipation of the PMIC. So the maximum power dissipation occurs in the highest loading ,and the efficiency of switches usually 80%-90%,you also refer to the datasheet existing efficiency curves to estimate. The LDO efficiency usually equal to the ratio between VOUT and VIN.

Combining with the thermal characteristics in datasheet you could do the thermal analysis well.

Hope these can help you!