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TPS62730 in LPM3 mode

Yaniv Reibenbacg
Intellectual 860 points
Other Parts Discussed in Thread: CC1120, TPS62730, TPS82740A, TPS62740

Hi,

Hi,

We have added a TPS62730 to our deign(MSP430 +CC1120) in the current consumption in LPM3 mode is increased from 8uA to 44uA.

When I enter bypass mode the current consuption is returned to 8uA

is that the normal behavior of the TPS62730? are we suppose to enter bypass mode every time we enter LPM3? 

Currently our design can change between bypass and TPS62730  only by soldering 10K R.... is there a work around?  very low currents are mandatory for our design

  • 0
    TI__Guru**** 150770 points
    Let me confirm a few things about your system to make sure I am understanding you.

    The 8 or 44 uA current consumption is from your battery (or power supply)? Is the MSP430 + CC1120 placed on the output of the TPS62730? Is there anything else in your system?

    If all of that is correct, then yes a 44uA from 8uA increase in input current from the battery sounds reasonable. The TPS62730 draws much more Iq when operating than when in bypass mode. The IC is designed to be controlled by an MSP430-type device to change between bypass and buck modes as the operating conditions change. You are supposed to intelligently drive this pin with this device.

    But since we released the TPS62730, we have released the TPS62740 and TPS82740A/B. These have lower operating currents in buck mode, so you don't need to switch between modes.