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The is a non-LDO linear regulator, which means it needs a higher input voltage. How much higher depends on the type of regulator.

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How does it go from a Maximum dropout voltage to a minimum input voltage? Home Questions Tags Users Unanswered. All parameters are specified under certain conditions, and datashewt the output voltage we can see that the condition is that the input voltage is minimum If so, what is the current like that it outputs? 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.

I’ve seen LDOs with a dropout voltage of 50 mV. Even though the typical dropout voltage is 2 780112, you should use the maximum value in your design. All linear regulators have a minimum dropout voltageor difference.

The datasheet does say how much it needs, but you may have to look for it. On the datasheet it doesn’t mention an input voltage. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. Post as a guest Name. That means that when your load consumes 10W the switcher will only dissipate 1W. Linear regulators are different. Sign up using Email and Password. This is a snapshot of page 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.


Peter Mortensen 1, 3 14 A note on dissipation: So if you have a 12W load it will draw 1A from the regulator. Sign up using Facebook. This is a snapshot of page 8: 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.

So the 20V delivers 20W, while the load only consumes 12W. Email Required, but never shown. But since there’s this voltage drop the input voltage has to be higher than the output voltage. The maximum dropout voltage Vd is 2. The difference of 8W will be dissipated in the regulator. The input voltage must be above the output.

They are like a variable series resistor between input and output, causing a voltage drop across the regulator. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

An LDO might have a dropout voltage of 0. If you have an input voltage of 20V the same 1A will be drawn datashee that 20V.

minimum input voltage? – Electrical Engineering Stack Exchange

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On page 6 7812 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. 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 datashee even ultra low drop-out types which only need a few tens of mV.

The current to your load flows through the regulator and is the same current as will be fatasheet from the input voltage. From what i understand then from your answer Since the output is 12 volts, you add the two together to get a minimum input of So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.

Voltage regulators basically can be divided in two big groups: