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The input voltage must be above the output. The maximum dropout voltage Vd is 2. If you have an input voltage of 20V the same 1A will be drawn from that 20V. A note on dissipation: Home Questions Tags Users Unanswered. Dstasheet are like a variable series resistor between input and output, causing a voltage drop across the regulator.

Sign up using Email and Password. Dean 4, 22 57 Since the output is 12 volts, you add the two together to get a minimum input of Email Required, but never shown.

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This is a snapshot of page 8: Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts.

This is a snapshot of page That means that when your load consumes 10W the switcher will only dissipate 1W. Voltage regulators basically can be divided in two big groups: 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.


minimum input voltage? – Electrical Engineering Stack Exchange

Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. How does it go from a Maximum dropout voltage to a minimum input voltage?

If so, what is the current like that it outputs? On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. 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.

I’ve seen LDOs with a dropout voltage of 50 mV. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. Sign up or log in Sign up using Google. Sign up using 78102. 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.

An LDO might have datasjeet dropout voltage of 0. The difference of 8W will be dissipated in the regulator. All linear regulators have a minimum dropout voltagesatasheet difference. 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. 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 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.


Linear regulators are different. How much higher depends on the type of regulator.

The is a non-LDO linear regulator, which means it needs a higher input voltage. So if you have a 78021 load it will draw 1A from the regulator.

So the 20V delivers 20W, while the load only consumes 12W. A control element will vary the resistance in practice a datashete so that the output voltage will remain constant regardless of input voltage and load.

On the datasheet it doesn’t mention 78102 input voltage. But since there’s this voltage drop the input voltage has to be higher than the output voltage. Post as a guest Name. The datasheet does say how much it needs, but you may have to look for it. From what i understand then from your answer Peter Mortensen 1, 3 14