LM3880: LM3880 with 12V power source

To whom it may concern,

I am planning to use two of LM3880 to control the power sequence for Xilinx Kintex FPGA.

The power source of PCB is 12V 10A, and I am using that power source to generate 1.0V, 1.5V, 1.8V, 2.0V and 3.3V

Since the maximum input voltage of LM3880 is 5.5V, can I use few resistors to form a voltage divider to turn the 12V power source to 5V as VCC for LM3880?

Is that going to be okay for me to use LM3880 like this? 

Serm Wang：

Instear of EN pin,Does LM3880 going to detect the voltage at VCC pin?   The voltage level of VCC pin drops, does it is going to active the power-off sequence?

,

Johnsin Tao：

Hi

    如果你只有1个12V， 肯定要做出一个小于5.5V例如3.3V的电压给LM3880供电，可以选择一些便宜的LDO, 或者直接用三极管加稳压管的方式来做都是可以的。  之后LM3880的时序信号flag 可以直接上拉这个3.3V.