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电源选择,关于LM1084

Other Parts Discussed in Thread: LM1084, TPS54424, TPS54620, TPS54622, TPS54623, TPS53313, TPS54521, TPS62135, TPS62136, TPS5450

1、目前需要一个7.5V转7V,输出电流4A,请问LM1084合适吗?

2、手册上我看LM1084的dropout电压最小要达到1.5V,就算我把输入7.5V能够调到8.5V满足dropout电压的要求,1.5V*4A=6W的热耗也是很麻烦,请问有么好的方案吗?怎么散热,或者有没有其他片子?

3、LM1084的封装底部也是接输出电压吗?