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TPS65982/982D power consumption measurement different from spec

Sam Pan
Expert 3860 points
Other Parts Discussed in Thread: TPS65982D, TPS65982

Hi team,

I measured TPS65982 and TPS65982D power consumption on EVM(without type C connection) and found some mode different from spec. Already set all GPIO as unused, no GPIO pull high thus no GPIO sink current from LDO_3V3

Would this due to different FW variation? ASUS design IP team is surveying each vendor power consumption measurment with spec, they would like to confirm the cause of the difference and need your help, thanks!  

 

TPS65982

VIN_3V3 = VDDIO = 3.3V, PP_CABLE = VBUS = 0V

Active: 5.89mA

idle: 2.57mA

Sleep: 0.096uA

 

TPS65982D

VIN_3V3 = VDDIO = 3.3V, PP_CABLE = VBUS = 0V

Active: 5.30mA

idle: 2.74mA

Sleep: 0.096uA

 

TPS65982 active is pretty close to datasheet

But idle is about 2.8mW higher than spec

 

TPS65982D active 2mW lower than spec and idle 3.3mW higher than spec

Reply from Arun Menon:

Hi Sam,

 

You said you were measuring the Power consumption on the EVM rite? How did you power up the EVM? Barrel Jack connector? There  might be some loss to the 20V to 3.3V regulator on the EVM. The Datasheet power numbers are for only TPS65982 and TPS65982D alone.

 

I am not sure if the external circuitry is the reason for little higher power consumption.

 

Regards,

Arun

  • 0
    TI__Expert 3860 points

    Hi Arun,

    I measured on EVM without barrel jack connection, DC power supply to VIN_3V3 as below photo. I have removed L2 and R82, set all GPIO as unused and set all dip switch to pull down on EVM, then the power consumption should be only from TP65982/982D VIN_3V3.

    Anything else I should modify from EVM to get the right power consumption? Thanks!

    Regards,

    Sam

  • 0 in reply to Sam Pan
    TI__Expert 3860 points
    Sorry for type, correct my measurement on EVM

    TPS65982

    VIN_3V3 = VDDIO = 3.3V, PP_CABLE = VBUS = 0V

    Active: 5.89mA

    idle: 2.57mA

    Sleep: 0.096mA



    TPS65982D

    VIN_3V3 = VDDIO = 3.3V, PP_CABLE = VBUS = 0V

    Active: 5.30mA

    idle: 2.74mA

    Sleep: 0.096mA


    TPS65982D spec data is probably not final, but for TPS65982
    From spec idle mode is 1.66mA with VIN_3V3 = VDDIO = 3.45V, power consumption = 5.72mW
    Bu the real measurement is 2.57mA with VIN_3V3 = VDDIO = 3.3V, power consumption = 8.48mW

    Is it within the variation of the spec? Because the spec only show typ value, no minimum and maximum

    Thanks!
    Sam