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So if you have a 12W load it will draw 1A from the regulator. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design. If you have an input voltage of 20V the same 1A will be drawn from that 20V. The difference of 8W will be dissipated in the regulator.

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

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policy78021 that your continued use of the website is subject to these policies. 7801 what i datasheeet then from your answer 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. On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2.


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.

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. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. Dean datashete, 22 57 Linear regulators are different.

The input voltage must be above the output. The maximum dropout dataasheet Vd is 2. Voltage regulators basically can be divided in two big groups: The is a non-LDO linear regulator, which means it needs a higher input voltage.

This is a snapshot of page 8: The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts.

Sign up using Facebook. That means that when your load consumes 10W the switcher will only dissipate 1W. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.

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 Home Questions Tags Dataaheet Unanswered.

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Email Required, but never shown. But since there’s this voltage drop the input voltage has to be higher than the output voltage. So the 20V delivers 20W, while the load only consumes 12W. Sign up or log in Sign up using Google.


Since the output datwsheet 12 volts, you add the two together to get a minimum input of This daatasheet a snapshot of page A note on dissipation: Sign up using Email and Password.

minimum input voltage? – Electrical Engineering Stack Exchange

How does it go from a Maximum dropout voltage to a minimum input voltage? On the datasheet it doesn’t mention an input voltage. How much higher depends datxsheet the type of regulator. All linear regulators have a minimum dropout voltageor difference.

I’ve seen LDOs with a dropout voltage of 50 mV. An LDO might have a dropout voltage of 0. The datasheet does say how much it needs, but you may have to look for it.

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Peter Mortensen 1, 3 14 The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. They are like a variable series resistor between input and output, causing a voltage drop across the regulator.