Linear Voltage Regulators

A Linear Voltage Regulator ensures the output voltage from the circuit is maintained at a specific voltage.

The device acts as a variable resistor, continuously adjusting to maintain a constant output voltage. The regulated voltage must be lower than the input voltage. Simple voltage regulator contains a Zener Diode and a resistor but more complicated versions include elements like a voltage reference and error amplifiers.

A more specific type of regulator are Low Dropout Voltage Regulators (LDO) which can regulate voltage even when the power supply voltage is very close to the supply voltage.


How to choose linear voltage regulator ICs?


The primary feature in choosing a regulator is usually the Output voltage as the main purpose of one is to regulate the voltage to a specific value such as 3.3V. Its accuracy to this voltage across temperature and load current is another consideration as is its maximum load. The dropout voltage value will be particularly important with battery applications.


How to test a linear voltage regulator?


  1. Set your multimeter to the voltage setting
  2. Check the datasheet to determine which pins are the ground, input and output.
  3. Attach the red wire to the input and the black wire to the ground, the multimeter should give a reading higher than the regulators' output value. If not then there is a power supply issue.
  4. Attach the red to the ground and the black wire the output, the multimeter should then give the regulators' output value (plus minus its accuracy). If not then the regulator is likely to be faulty.

...
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Beskrivning Pris Output Voltage Maximum Output Current Output Type Package Type Mounting Type Minimum Input Voltage Maximum Input Voltage Pin Count Power Rating Minimum Operating Temperature Maximum Operating Temperature Number of Outputs Polarity Accuracy
RS-artikelnummer 464-114
Tillv. art.nrMC78M12CDTG
VarumärkeON Semiconductor
3,924 kr
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12 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 125-0057
Tillv. art.nrMC78M12CDTG
VarumärkeON Semiconductor
3,567 kr
Each (In a Tube of 75)
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12 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 686-9552
Tillv. art.nrL78L33ABZ-AP
VarumärkeSTMicroelectronics
2,564 kr
Each (In a Pack of 25)
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3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 168-6578
Tillv. art.nrL78L33ABZ-AP
VarumärkeSTMicroelectronics
0,90 kr
Each (On a Tape of 2000)
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3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 146-2236
Tillv. art.nrTS78L05ACY RMG
1,655 kr
Each (On a Reel of 1000)
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5 V 150mA Fixed SOT-89 Surface Mount - 35 V 4 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 398-524
Tillv. art.nrTS78L05ACY RMG
4,045 kr
Each (In a Pack of 50)
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5 V 150mA Fixed SOT-89 Surface Mount - 35 V 4 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 178-5135
Tillv. art.nrL78L12ABD-TR
VarumärkeSTMicroelectronics
0,865 kr
Each (On a Reel of 2500)
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- - - - - - - - - - - - - -
RS-artikelnummer 686-9347
Tillv. art.nrL78L12ABD-TR
VarumärkeSTMicroelectronics
2,44 kr
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12 V 100mA Fixed SOIC Surface Mount - 35 V 8 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 125-0051
Tillv. art.nrMC7812CDTG
VarumärkeON Semiconductor
4,868 kr
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12 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 805-6503
Tillv. art.nrMC7812CDTG
VarumärkeON Semiconductor
5,356 kr
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12 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 102-3487
Tillv. art.nrLM317LZG
VarumärkeON Semiconductor
1,487 kr
Each (In a Bag of 2000)
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1.2 → 37 V 20mA Adjustable TO-92 Through Hole - - 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 516-6177
Tillv. art.nrMC7806CTG
VarumärkeON Semiconductor
5,79 kr
Each
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6 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 806-2790
Tillv. art.nrLM317AHVT
VarumärkeON Semiconductor
6,644 kr
Each (In a Tube of 50)
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1.2 → 57 V 1.5A Adjustable TO-220 Through Hole - 60 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 125-0050
Tillv. art.nrMC7806CTG
VarumärkeON Semiconductor
4,794 kr
Each (In a Tube of 50)
Enheter
6 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 516-4783
Tillv. art.nrLM317LZG
VarumärkeON Semiconductor
4,76 kr
Each
Enheter
1.2 → 37 V 20mA Adjustable TO-92 Through Hole - - 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 918-1971
Tillv. art.nrL7805CV
VarumärkeSTMicroelectronics
3,911 kr
Each (In a Tube of 50)
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5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 922-8474
Tillv. art.nrZLDO1117G33TA
VarumärkeDiodesZetex
1,736 kr
Each (On a Reel of 1000)
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3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS-artikelnummer 761-4612
Tillv. art.nrLM337IMP/NOPB
VarumärkeTexas Instruments
20,514 kr
Each (In a Pack of 5)
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-1.2 → -37 V 1.5A Adjustable SOT-223 Surface Mount -4.2 V -40 V 3+Tab - -40 °C +125 °C 1 Negative -
RS-artikelnummer 178-5183
Tillv. art.nrL78L15ACZ
VarumärkeSTMicroelectronics
0,892 kr
Each (On a Reel of 2500)
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- - - - - - - - - - - - - -
RS-artikelnummer 714-7774
Tillv. art.nrL78L15ACZ
VarumärkeSTMicroelectronics
1,158 kr
Each (In a Pack of 50)
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15 V 100mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive ±5%
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