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The datasheet does say how much it needs, but you may have to look for it. A note on dissipation: Post Your Eatasheet 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.

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Dean 4, 22 57 Since the output is 12 volts, you add the two together to get a minimum input of datashee This is a snapshot of page 8: The difference of 8W will be dissipated in the regulator. So the 20V delivers 20W, while the load only consumes 12W. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2.

Sign up using Email and Password. 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. 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.


Voltage regulators basically can be divided in two big groups: 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 An LDO might have a dropout voltage of 0. All linear regulators have a minimum dropout voltageor difference. They are like a variable series resistor between input and output, causing a voltage drop across the regulator. But since there’s this voltage drop the input voltage has to be higher than the output voltage.

How does it go from a Maximum dropout voltage to a minimum input voltage? The current to your load flows through the regulator and is the same 87012 as will be drawn from the input voltage. From the above it may look like you best make your input voltage a lot higher than datashset 12V output, but that’s not true.

How much higher depends on the type of regulator. If you have an input voltage of 20V the same 1A dataasheet be drawn from that 20V. Home Questions Tags Users Unanswered. The input voltage must be above the output. Sign up using Facebook.

So if you have a 12W load it will draw 1A from the regulator.

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That means that when your load consumes 10W the switcher will only dissipate 1W. From what i understand then from your answer On the datasheet it doesn’t mention an input voltage. Linear regulators are different.


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 ddatasheet drop-out types which only need a few tens of mV. If so, what is the current like that it outputs? Sign up or log in Sign up using Google.

I’ve seen LDOs with a dropout datqsheet of 50 mV. This is a snapshot of page So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

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Peter Mortensen 1, 3 14 Email Required, but never shown. Post as a guest Name. The maximum dropout voltage Vd is 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. The is a non-LDO linear regulator, which means it needs a higher input voltage. A control element will vary the resistance in practice a transistor so that the output voltage datashfet remain constant regardless of input voltage and load. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.

Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.