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TPS61030 down mode?

Simon Peacock
Prodigy 80 points
Other Parts Discussed in Thread: TPS63020, TPS61030

We have need of a switcher that can maintain a voltage of 3.3V when the supply is 2.7V and 3.6V.  It also needs to supply 2A peaks to a 3G Cell phone module as well as powering an ARM processor.

Since all the devices on the 3.3V rail can handle 3.6V, there is no need to use a more complicated solution (eg TPS63020) which is hard to source at present due to lead times.

 

My question is.. what will the device do when the voltage climbs to 3.3V and above.

 

Thanks

Simon

  • 0
    TI__Guru**** 150950 points

    The TPS63020 is the best fit for this application.  It is unfortunate that you are unable to get them quickly, but you can contact your local TI sales representative or distribution partner and they can work with you to get you ICs when you need them.

    The TPS61030, unlike some of our boost converters, does not have a down-mode.  So, it is not designed for operation with Vin >= Vout.  If Vin is taken slightly above Vout and the IC is in power save mode, the IC will switch when it needs to in order to keep Vout above the 3.3V setpoint.  When Vout is above the setpoint, the IC will turn off (go high impedance) until it drops back below the 3.3V target value.  This may create a larger output voltage ripple than desired but the magnitude of this ripple depends on your load, input source impedance, etc. 

    When Vin is a lot (around 0.3V) greater than Vout, the IC will pass Vin to Vout.

    So, I recommend testing the EVM with your configuration to see if it will meet your needs.