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TLV62084: Efficiency seems low

Part Number: TLV62084


I'm using TLV62084DSGR. As per calculation, 5V to 1.2V @1.4A output current it dissipates(regulator only) 345mW of power. Is it normal?? 

Is there any better switching regulator that has minimal power dissipation for the same above application?? Or Is there any other way to minimize this dissipation ??

Pls advice..