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They are like a variable series resistor between input and output, causing a voltage drop across the regulator. This is a snapshot of page The datasheet does say how much it needs, but you may have to look for it.

A note on dissipation: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2.

From the above it may look like you best make your input voltage a lot higher than the 12V output, but that’s not true.

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Linear regulators are different. Post as a guest Name.

If so, datashheet is the current like that it outputs? Peter Mortensen 1, 3 14 Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. If you have an input voltage of 20V the same 1A will be drawn from that 20V.


If we look further we can see two values for line regulation; it appears that this is best if the input voltage is at least 16V. Sign up or log in Sign up using Google.

The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. That means that when your load consumes 10W the switcher will only dissipate 1W. I’ve seen LDOs with a dropout voltage of 50 mV.

Sign up using Email and Password. From what i understand then from your answer The maximum dropout voltage Vd is 2. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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So the 20V delivers 20W, while the load only consumes 12W. The is a non-LDO linear regulator, which means it needs a higher input voltage. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

All parameters are specified under certain conditions, and for the output voltage we can see that the condition is that the input voltage is minimum By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Since the output is 12 volts, you add the two together to get a minimum input of This is a snapshot of page 8: On the datasheet it doesn’t mention an input voltage. Sign up using Facebook. The input voltage must be above the output. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.


Home Questions Tags Users Unanswered. There are LDOs Low Drop-Out which still can regulate the output if the input is only a few hundreds of mV higher and there are even ultra low drop-out types which only need a few tens of mV.

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A is a linear regulator, and does not step up the input voltage if the input is below the output for that you need a DC-DC boost regulator. All linear regulators have a minimum dropout voltageor 778012. How does it go from a Maximum dropout voltage to a minimum input voltage?

An LDO might have a dropout voltage of 0. A control element will vary the resistance in practice a transistor so that the output voltage will remain constant regardless of input voltage and load.

But since there’s 788012 voltage drop the input voltage has to be higher than the output voltage. Dean 4, 22 57 The difference of 8W will be dissipated in the regulator. So if you have a 12W load it will draw 1A from the regulator. Email Required, but never shown. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. Voltage regulators basically can be divided in two big groups: How much higher depends on the type of regulator.