5V 5A Higher currents by LM340-5 and 2N4398

For my new USB hub I need around 2 Ampere power, the circuit I designed earlier was producting only 500mA, so I came up with this circuit. This is almost same as previous one but adding a transistor solved the high current requirement. The transistor use to share some the the current. The Voltage regulator maintains the output voltage and still operates short circuit protection. The current 1 A from the regulator and 4 A from the transistor sum up to 5 Amperes : )

The current that the transistor takes is set by the resistor R1 and R2 i.e I=R2/R1 * RegulatorCurrent.

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