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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 using Datqsheet. 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.

datashheet From the above it may look like you best make dwtasheet input voltage a lot higher than the 12V output, but that’s not true. Email Required, but never shown. Even though the typical dropout voltage is 2 volts, you should use the maximum value dtaasheet your design.

The maximum dropout voltage Vd is 2. This is a snapshot of page Sign up using Email and Password. Voltage regulators basically can be divided in two big groups: If you have an input voltage of 20V the same 1A will be drawn from that 20V.

On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. How does it go from a Maximum dropout voltage to a minimum input voltage? Peter Mortensen 1, 3 14 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.


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An LDO might have a dropout voltage of 0. All linear regulators have a minimum dropout voltageor difference. Home Questions Tags Users Unanswered. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. A note on dissipation: I’ve seen LDOs with a dropout voltage of 50 mV. 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 The current to your load flows through the regulator and is the datasheeh current as will eatasheet drawn from the input voltage.

So the 20V delivers 20W, while the load only consumes 12W.

If so, what is the current like that it outputs? 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.

The difference of 8W will be dissipated in the regulator. The is a non-LDO linear regulator, which means it needs a higher input voltage. The input voltage must be above the output.

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They are like a variable series resistor between input and output, causing a voltage drop across the regulator. Sign up or log in Sign up using Google. xatasheet

Linear regulators are different. A control element will vary the resistance in practice a transistor so that the datazheet voltage will remain constant regardless of input voltage and load. So if you have a 12W load it will draw 1A from the regulator. 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.

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Dean 4, 22 57 But since there’s this voltage drop the input voltage has to be higher than the output voltage. From what i understand then from your answer The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. How much higher depends on the type of regulator. Post as a guest Name. That means that when your load consumes 10W the switcher will only dissipate 1W.

This is a snapshot of page 8: Since the output is 12 volts, you add the two together to get a minimum input datasheey On the datasheet it doesn’t mention an input voltage.

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The datasheet does dafasheet how much it needs, but you may have to dattasheet for it. 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. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.