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what are the major differences for LDO's & Switcher

ARUNA KUMAR K H
Prodigy 40 points

Dear Sir,

1.What are the major difference for LDO's & Switcher.

2.i have 5V input and i need 1.2V output voltage which regulator is better.

thanks in Advance.

Arun kumar

  • 0
    TI__Expert 5565 points

    Hi Aruna,

    It really depends on your application. An LDO is definitely easier to implement as the number of external components is limited. However, depending on the amount of current being supplied to your load, using an LDO may not be feasible. That's because the amount of heat dissipated by an LDO is equal to P = (Vin - Vout) x Iout. In this case, that means your efficiency will be around 24%. This may not be a problem if you're supplying a small amount of current. Switchers, on the other hand, will operate at a much higher efficiency (90%+). They'll typically be a bit larger as well. However, they're implementation is a bit more involved and generate a small ripple on their output. This, again, may or may not be a problem for your application.

    Here's a little more info on LDOs.

    Hope this helps!

    - Aaron

  • 0 in reply to Aaron Paxton
    Intellectual 510 points

    Some TI switchers are positioned as "LDO replacement" ( TPS621 family ).

    Please give more information about it.

    P.S. Found answer in Non-Isolated DC/DC Forum.