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TPS63001 PS mode Current

DooHyeon Kim
Prodigy 40 points
Other Parts Discussed in Thread: TPS63001

Hi,

My customer applied TPS63001 to the Wi-fi chip power in Mobile Router.

Before apply TPS63001, They used XC9236. (step down converter)

 Problem is TPS63001 current consumption.

They checked Mobile Router’s current consumption when used XC9236, TPS63001 PS mode enable, TPS63001 PS mode Disable.

They expect the same current consumption result when using TPS63001 and XC9236.

But, result is more higher than XC9236 When using TPS63001 PS enable/disable

 

Mobile Router set status current consumption as below: (PS enable : connect to GND with PS/Sync pin / PS disable : connect to Vin with PS/Sync pin)

　

Sleep mode Current

    Operating mode Current

XC9236

2mA

105mA

TPS63001 PS enable

2.7mA

180mA

TPS63001 PS disable

6mA

105mA

 

I have a question as below

  1. Is this situation is right?

  2. They can’t assigned GPIO. So, Do you have a method that current consumption performance like as XC9236 without GPIO control?

  3. Can you recommend to me any other component? It must be Pin to Pin with TSP63001.

 

Best Regards,

DH.

  • 0
    TI__Guru**** 150820 points

    The XC9236 is a buck only converter, while the TPS63001 is a buck-boost converter. The extra functionality of the TPS63001 means that it requires a higher operating current (Iq) which lowers the efficiency somewhat at very light loads.  

    As well, the XC9236 device does not seem to have a forced PWM mode, whereas the TPS63001 does.  Input current will always be higher in forced PWM mode compared to PFM or power save mode, when the load is light.

    There is no need to toggle the PS/SYNC pin of the TPS63001.  Just tie it low and it will automatically transition between power save and PWM modes as the load changes.

    The operating current mode measurement should be reasonably similar for each device, assuming they are tested under the same operating conditions (Vin and Iout).  This app note explains the proper test setup for measuring efficiency: http://www.ti.com/lit/an/slva236/slva236.pdf   You likely need to add more input capacitance after the input current meter to smooth out the input current and get an accurate reading.

    There are no other devices that are pin to pin with the TPS63001.  However, if they just need the buck functionality, like the XC device, we have many other buck converters to choose from.