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TPS5430: Need to boost the current output

Part Number: TPS5430


I am supplying the TPS5430 form a power supply in my board, which is 24VDC, 30mA. 

Now, I am converting it to 3.3VDC (successfully achieved) using the reference design in datasheet.

My output load current required is 600mA. 

I have to use external power supply as the on-board one is only 30mA.

Any idea, how can i increase the current in the output side , while using my on-board supply..?

Can i use a transistor from input to output as used in many voltage regulators(like one attached here)..?

Please help, thanks in advance..