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So if you have a 12W load it will draw 1A from the regulator. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use datasheft the website is subject to these policies. If you have an input voltage of 20V the same 1A will be drawn from that 20V.

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.

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 note on dissipation: The is a non-LDO linear regulator, which means it needs a higher input voltage.


Sign up using Facebook. Peter Mortensen 1, 7801 14 But since there’s this voltage drop the input voltage has to be higher than the output voltage.

All parameters are specified under certain conditions, and for the output voltage we can see that the condition is that the input voltage is datasheey The input voltage must be above the output. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.

Sign up using Email and Password. On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. An LDO might have a dropout voltage of 0.

The difference of 8W will be dissipated in the regulator. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. All linear regulators have a minimum dropout voltageor difference. 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. Voltage regulators basically can be divided in two big groups: 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.

I’ve seen LDOs with a dropout voltage of 50 mV. 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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This is a snapshot of page 8: 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.

On the datasheet it doesn’t mention an input voltage. Sign up or log in Sign up using Google. The maximum dropout voltage Vd is 2.

That means that when your load consumes 10W the switcher will only dissipate 1W.

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Post as a guest Name. Linear regulators are different. From what i understand then from your answer Home Questions Tags Users Unanswered. Dean 4, 22 57 They are like a variable series resistor between input and output, causing a voltage drop across 7812 regulator.