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 169-8952
Tillv. art.nrTS78L05CS RLG
1,266 kr
Each (On a Reel of 2500)
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5 V 150mA Fixed SOP Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 751-5183
Tillv. art.nrZLDO1117G33TA
VarumärkeDiodesZetex
3,669 kr
Each (In a Pack of 25)
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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 922-8474
Tillv. art.nrZLDO1117G33TA
VarumärkeDiodesZetex
1,672 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 178-5183
Tillv. art.nrL78L15ACZ
VarumärkeSTMicroelectronics
0,811 kr
Each (On a Reel of 2500)
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- - - - - - - - - - - - - -
RS-artikelnummer 761-4612
Tillv. art.nrLM337IMP/NOPB
VarumärkeTexas Instruments
14,992 kr
Each (In a Pack of 5)
Enheter
-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 921-5324
Tillv. art.nrLM337IMP/NOPB
VarumärkeTexas Instruments
7,681 kr
Each (On a Reel of 1000)
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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 178-5144
Tillv. art.nrL78L33ABUTR
VarumärkeSTMicroelectronics
1,317 kr
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- - - - - - - - - - - - - -
RS-artikelnummer 168-7135
Tillv. art.nrL7812CV-DG
VarumärkeSTMicroelectronics
4,347 kr
Each (In a Tube of 50)
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12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-artikelnummer 918-1975
Tillv. art.nrL7812CV
VarumärkeSTMicroelectronics
3,243 kr
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12 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 661-3772
Tillv. art.nrTPS51200DRCT
VarumärkeTexas Instruments
11,48 kr
Each
Enheter
-0.1 → 3.5 V 3A Adjustable SON Surface Mount 2.375 V 3.5 V 10 1.92W -40 °C +85 °C 1 Positive -
RS-artikelnummer 825-6804
Tillv. art.nrTPS51200DRCR
VarumärkeTexas Instruments
7,692 kr
Each (In a Pack of 5)
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0.75 1.25 V 5.5A Adjustable SON Surface Mount 1.1 V 3.5 V 10 0.79W -40 °C +85 °C 1 Positive ±5%
RS-artikelnummer 113-8596
Tillv. art.nrLM317TG
VarumärkeON Semiconductor
5,47 kr
Each (In a Tube of 50)
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1.2 37 V 2.2A Adjustable TO-220 Through Hole -0.3 V 40 V 3 - -55 °C +150 °C 1 - -
RS-artikelnummer 686-9464
Tillv. art.nrL78L33ABUTR
VarumärkeSTMicroelectronics
3,243 kr
Each (In a Pack of 25)
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3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 793-1355
Tillv. art.nrL7812CV-DG
VarumärkeSTMicroelectronics
4,777 kr
Each (In a Pack of 10)
Enheter
12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-artikelnummer 162-8792
Tillv. art.nrTPS51200DRCR
VarumärkeTexas Instruments
3,511 kr
Each (On a Reel of 3000)
Enheter
0.75 1.25 V 5.5A Adjustable SON Surface Mount 1.1 V 3.5 V 10 0.79W -40 °C +85 °C 1 Positive ±5%
RS-artikelnummer 742-7764
Tillv. art.nrADP151AUJZ-3.3-R7
VarumärkeAnalog Devices
9,72 kr
Each
Enheter
3.3 V 200mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2.5%
RS-artikelnummer 102-5703
Tillv. art.nrLM317HVT/NOPB
VarumärkeTexas Instruments
18,736 kr
Each (In a Tube of 45)
Enheter
1.2 57 V 1.5A Adjustable TO-220 Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS-artikelnummer 922-2410
Tillv. art.nrTPS7A3001DGNT
VarumärkeTexas Instruments
25,637 kr
Each (On a Reel of 250)
Enheter
-33 V 200mA Adjustable MSOP Surface Mount -36 V -3 V 8 - -40 °C +150 °C 1 Negative 2.5%
RS-artikelnummer 168-6797
Tillv. art.nrL7809CV
VarumärkeSTMicroelectronics
3,456 kr
Each (In a Tube of 50)
Enheter
9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS-artikelnummer 534-3908
Tillv. art.nrLM7912CT/NOPB
VarumärkeTexas Instruments
13,96 kr
Each
Enheter
-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
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