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Buck boost converter for home use (DC load and AC load)

LexenZ
Prodigy 20 points
Other Parts Discussed in Thread: TPS40210, LM3478, LM5118, LM25118

Dear pros of texas instruments,

I am researching on a suitable buck boost converter that is able to power any smartphone of up to 2A and is also flexible enough to change to power an ac load (Say maybe a light bulb).

Through my research I found a simple buck boost converter schematic that made use of the LTC3440 chip. 
(http://www.circuitstoday.com/buck-boost-converter-circuit)
However, it only has a maximum output of 600mA which is insufficient to power up any smartphone of today in 2017.


What ic chip/components should I use to further increase the output current if i were to retain the same design?

Hope to receive any input from the committee here. 

Regards

John

  • 0
    TI__Guru* 78240 points
    Thank you for reaching out. What is your operating voltages? if the voltage? if the voltage is not high, you may consider a sepic to achieve buck-boost function with a high current boost converter (integrate FETs). You may also have a look at our TPIC74100 if your power level is reduced. In addition, do not overlook our boost controllers (TPS40210, LM3478, etc) or buck-boost controllers (LM25118, LM5118, etc).

    Thanks,
    Youhao Xi, System and Applications Engineering, APP-BMC-BCS, TI
  • 0 in reply to Youhao Xi
    Prodigy 20 points

    Dear Youhao Xi,

    Thanks for replying me!

    My operating voltages for output would be 5V, as for AC loads for power up bulbs I am unsure of the voltages.

    Even though my voltages are low, I would like to be able to showcase the buck boost effect, especially for boost as I wish to see the output voltage being higher than the input voltage.

    With that said, will the current design i provided with the link before be suitable by just replacing your recommended controllers? (LM25118, LM5118)

    Regards

    John

  • 0 in reply to LexenZ
    TI__Guru* 78240 points
    The other part that you mentioned can only deliver 4.2Vmax. The LM25118/LM5118 are not direct drop in replacement. They require external MOSFETs and should be able to meet your needs.