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Home Questions Tags Users Unanswered. The input voltage must be datashedt the output. All daasheet regulators have a minimum dropout voltageor difference. A note on dissipation: The maximum dropout voltage Vd is 2. 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.

They are like a variable series resistor between input and output, causing a voltage drop across the regulator.

From what i understand then from your answer The datasheet does say how much it needs, but you may have to look for it. Sign up using Facebook.

The difference of 8W will be dissipated in the regulator. Datwsheet if you have a 12W load it will draw 1A from the regulator.

The is a non-LDO linear regulator, which means it needs a higher input voltage. I’ve seen LDOs with a dropout voltage of 50 mV. Sign up or log in Sign up using Google.


If you have an input voltage of 20V the same 1A will be drawn from that 20V. How does it go from a Maximum dropout voltage to a minimum input voltage? Linear regulators are different. This is a snapshot of page 8: So the 20V delivers 20W, while the load only consumes 12W.

Dean 4, 22 57 Email Required, fatasheet never shown.

The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. This is a snapshot of page Post as a guest Name. Since the output is 12 volts, you add the two together to get a minimum input of 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.

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. If we look further we can see two values for line regulation; it appears that this is best if datasheft input voltage is at least 16V.

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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. 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.


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. 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. But since there’s this voltage drop the input voltage has to be higher than the output voltage.

minimum input voltage? – Electrical Engineering Stack Exchange

How much higher depends on the type of regulator. Peter Mortensen 1, 3 14 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. On the datasheet it doesn’t mention an input voltage.