TPS65217CEVM: How to calculation input current consumption of pmic

Vishal,

There are three main components to this calculation:

• Quiescent current: this is the actual current consumed by the part. Typically this is listed as ISLEEP and/or IOFF for low-power modes, but you can also add together the Quiescent Current spec for each regulator (DCDCx and LDOx) to get a more detailed calculation
• Current through DC-DC converters: when the DC-DC converter is active, you can use the efficiency curve to estimate the efficiency at the operating point most common in your application. If DCDC1 = 1.5V and the DDR memory typically consumes 300mA, then the efficiency (η) is approximately 85% (referring to Figure 2 in TPS65217 datasheet on page 16). Power loss, Ploss = (Pin - Pout) where Pin = Pout/η , so Ploss = Pout*(1/η - 1) = 1.5V*0.3A*(1/0.85 - 1) = 79.4mA in my example where 
• Current through LDOs: The current out of the LDOs (IL, or ILOAD) is the same as the current into the LDOs, so Ploss = (Vout-Vin)*IL. For example, if LDO2 generates 3.3V and the system uses 100mA, Ploss = (5V - 3.3V)*0.1A = 170mW assuming a 5V input power supply.

All of these will help you understand power losses in the PMIC.