Need Regulator for 5V, 3A Output

[SR19]

Hi,

Shall i use LM338 Voltage regulator for 5V 3A output with 9V input? does Vin should be 5V greater than required output?

 

[crutschow]

The LM333 will work fine with 9V in for 5V output. Note that it will need to mounted on a good heatsink since it will dissipate 12W @ 3A output.

 

[alexan_e]

When the load current gets high it is usually a god idea to replace a linear regulator with a more efficient switching regulator like

(5A)
https://www.onsemi.com/PowerSolutions/product.do?id=MC34167
https://www.ti.com/product/lm2679

There are also 3A models but I'm not sure the output current will be enough for you

https://www.ti.com/product/lm2596

 

[SR19]

Hi,
Thank you both for the suggestions..

 

[alexan_e]

In case lm2596 (3A) suits you you can get a complete regulator board from ebay cheaper than the cost of the regulator alone (about $1-$1.5), but note that you may need to add a small heatsink for 3A.

 

[Externet]

You can use a 78T05.