求推荐24V转12V大电流DC-DC芯片方案！

LM5176你好焊接吗？
http://www.ti.com/tool/PMP20991?keyMatch=null&tisearch=tidesigns-power
看看这个
his reference design is a 4-switch buck-boost controller utilizing the LM5176 for industrial applications. The PMP20991 reference design has a minimum operating input voltage of 9V and a maximum input voltage of 36V. The design is capable of sourcing 25A continuous current at 12Vout. Switching frequency is set to 250kHz. PMP20991 is assembled on SV601348A PCB.

HTSSOP封装没问题，谢谢！

Hi
    webench选型，芯片并不全，你或者直接在DC/DC （外部开关）芯片list下选型： http://www.ti.com.cn/lsds/ti_zh/power-management/buck-controller-external-switch-products.page#p451max=25;420
   设置输出电流大于25A， 在选一下封装/最大输入电压/最大输出电压等条件，剩下的芯片并不是很多，可以逐一挑选。

那就用LM5176吧
按照我给你发的链接。里面原理图，PCB，BOM都有了。