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TPS62090 - Maximum Output Capacitance

Fabio Sponticcia
Prodigy 20 points
Other Parts Discussed in Thread: TPS62090, TPS62095

Hi,


I want use the TPS62090 to provide the 3V8 voltage to a GPRS module. The load requires a big value of capacitance (above 400uF).

In the datasheet I read:

"The output capacitor value can range from 10 μF up to 150 μF and beyond" (page 14);

but 400uF >> 150uF therefore I'm not sure if this device can be used in this application.


Thanks

  • 0
    TI__Guru**** 150830 points

    DCS-Control is very stable with larger output caps compared to other topologies.  400uF may be ok.  You can evaluate this through a load transient and/or bode plot.  This app note explains how to take a bode plot on DCS-Control: http://www.ti.com/lit/an/slva465a/slva465a.pdf

    But how much current does your GSM need?  The TPS62090 supplies 3A while the TPS62095 supplies 4A.  This is quite a lot of power, so I am a little surprised that you need to supplement with caps for the transmission pulses.

  • 0 in reply to Chris Glaser
    Prodigy 20 points

    Thanks for the quick answer,

    3A it's enough, the GSM module generates spike around 2A for 500usec.

    Yes I know 400uF it's too much, and probably I can reduce the caps during the test.