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 121-9150
Tillv. art.nrUA78L05AIPK
VarumärkeTexas Instruments
1,561 kr
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5 V 100mA Fixed SOT-89 Surface Mount 7 V 20 V 3 - -40 °C +125 °C 1 Positive ±5%
RS-artikelnummer 625-6338
Tillv. art.nrMC78M05ABDTG
VarumärkeON Semiconductor
6,142 kr
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5 V 700mA Fixed D-PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS-artikelnummer 300-344
Tillv. art.nrCSR604A
VarumärkeUnited Automation
274,63 kr
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230 V 6A Adjustable - Through Hole - 230 V 3 - 0 °C +70 °C - - -
RS-artikelnummer 793-1346
Tillv. art.nrL7805CV-DG
VarumärkeSTMicroelectronics
4,777 kr
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5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-artikelnummer 922-8317
Tillv. art.nrAP7333-33SAG-7
VarumärkeDiodesZetex
1,037 kr
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3.3 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS-artikelnummer 100-3972
Tillv. art.nrLM350AT/NOPB
VarumärkeTexas Instruments
24,945 kr
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1.2 33 V 3A Adjustable TO-220 Through Hole 4.2 V 35 V 3 25W -40 °C +125 °C 1 Positive ±1%
RS-artikelnummer 163-2612
Tillv. art.nrNCP4681DSQ33T1G
VarumärkeON Semiconductor
3,022 kr
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3.3 V 180mA Fixed SC-70 Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS-artikelnummer 517-1911
Tillv. art.nrTL317CD
VarumärkeTexas Instruments
7,026 kr
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1.2 32 V 100mA Adjustable SOIC Surface Mount 3.7 V 38 V 8 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 714-0679
Tillv. art.nrL78L05ACUTR
VarumärkeSTMicroelectronics
3,567 kr
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5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS-artikelnummer 516-5764
Tillv. art.nrMC78L12ACPG
VarumärkeON Semiconductor
4,094 kr
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12 V 100mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 751-3067
Tillv. art.nrAP7313-33SRG-7
VarumärkeDiodesZetex
2,788 kr
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3.3 V 150mA Fixed SOT-23R Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS-artikelnummer 911-2806
Tillv. art.nrMIC5282YMME
VarumärkeMicrochip
9,676 kr
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1.27 5.5 V 50mA Adjustable MSOP Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS-artikelnummer 785-7437
Tillv. art.nrNCV7812BTG
VarumärkeON Semiconductor
4,808 kr
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12 V 1A Fixed TO-220 Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 688-9294
Tillv. art.nrMC78M05CDTRKG
VarumärkeON Semiconductor
3,67 kr
Each (In a Pack of 2)
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5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 169-8944
Tillv. art.nrTS78L05CT A3G
1,105 kr
Each (On a Tape of 2000)
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5 V 150mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 921-6910
Tillv. art.nrLM340MP-5.0/NOPB
VarumärkeTexas Instruments
5,462 kr
Each (On a Reel of 1000)
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5 V 1A Fixed SOT-223 Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-artikelnummer 125-0052
Tillv. art.nrMC7818CTG
VarumärkeON Semiconductor
3,121 kr
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18 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 748-8772
Tillv. art.nrNCP4681DSQ33T1G
VarumärkeON Semiconductor
7,134 kr
Each (In a Pack of 5)
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3.3 V 180mA Fixed SC-70 Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS-artikelnummer 460-768
Tillv. art.nrLM340T-5.0/NOPB
VarumärkeTexas Instruments
15,82 kr
Each (In a Pack of 5)
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5 V 1A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS-artikelnummer 122-0380
Tillv. art.nrAP7313-33SRG-7
VarumärkeDiodesZetex
0,97 kr
Each (On a Reel of 3000)
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3.3 V 150mA Fixed SOT-23R Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
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