Is there any LDO chip with 3.3V5A output and input voltage around 5V?

guazhuaq

Is there any LDO chip with 3.3V5A output and input voltage around 5V? [Copy link]

Is there any LDO chip with 3.3V 5A output and input voltage around 5V?

lcofjp

I don't think so. The power consumption is too high. Why not use DCDC?

topwon

The voltage difference is 5-3.3=1.7V, the current is 5A, then the loss is 1.7x5=8.5W. Such an LDO can be used as a heating wire, right?

qwqwqw2088

LM1084 5A fixed/adjustable output linear regulator

qwqwqw2088

Pay attention to proper heat dissipation measures when using lm1084.pdf (2.16 MB, downloads: 7)

2018-11-8 13:13 上传

点击文件名下载附件

topwon

The LM1084 is a regulator with a maximum dropout of 1.5 V at 5 A of load current. If the input voltage is 5 V and the output voltage is 3.3 V, a voltage divider resistor must be connected in series at the input end, and the power must be at least 3 W.

chunyang

The output of LT1084 is 5A, while the output of LT1083 is 7.5A.

whuer

Don't use it this way, the product may catch fire at any time. It is better to use DCDC

chunyang

whuer posted on 2018-11-8 16:51 Never use it like this, the product may catch fire at any time, it is better to use DCDC

There are many high-power linear regulators. If they can catch fire at any time, how can such products exist? Pay attention to heat dissipation. Of course, in terms of energy efficiency, switching power supplies should undoubtedly be preferred. 5V input, 3.3V output, 5A LDO power consumption is 8.5W, a laptop CPU power consumption will be higher than this number, and a high-performance desktop CPU will consume more than 100W when fully loaded.

金海洋

Yes, I have used it, no problem.