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 912-9624
Tillv. art.nrADP151AUJZ-3.3-R7
VarumärkeAnalog Devices
5,29 kr
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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 102-2268
Tillv. art.nrLM317LDG
VarumärkeON Semiconductor
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount - - 8 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 686-9079
Tillv. art.nrLM217MDT-TR
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1.2 → 37 V 200mA Adjustable DPAK Surface Mount 3 V - 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 714-0666
Tillv. art.nrL7809CV
VarumärkeSTMicroelectronics
3,226 kr
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9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS-artikelnummer 742-7764
Tillv. art.nrADP151AUJZ-3.3-R7
VarumärkeAnalog Devices
10,65 kr
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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 100-5950
Tillv. art.nrLM7912CT/NOPB
VarumärkeTexas Instruments
11,942 kr
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-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-artikelnummer 535-9357
Tillv. art.nrLM340S-12/NOPB
VarumärkeTexas Instruments
15,242 kr
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12 V 1A Fixed D2PAK (TO-263) Surface Mount 14.6 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS-artikelnummer 145-4324
Tillv. art.nrKA7810ETU
VarumärkeON Semiconductor
3,195 kr
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10 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 739-0502
Tillv. art.nrKA7810ETU
VarumärkeON Semiconductor
7,61 kr
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10 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 464-091
Tillv. art.nrLM317LDG
VarumärkeON Semiconductor
3,557 kr
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount - - 8 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 102-5703
Tillv. art.nrLM317HVT/NOPB
VarumärkeTexas Instruments
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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 124-9986
Tillv. art.nrLM317LDR2G
VarumärkeON Semiconductor
0,771 kr
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount 4.2 V - 8 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 146-0587
Tillv. art.nrAS78L05ZTR-E1
VarumärkeDiodesZetex
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS-artikelnummer 686-9735
Tillv. art.nrL7824CP
VarumärkeSTMicroelectronics
6,452 kr
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24 V 1.5A Fixed TO-220FP Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS-artikelnummer 460-900
Tillv. art.nrLM338T/NOPB
VarumärkeTexas Instruments
18,84 kr
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1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS-artikelnummer 885-5423
Tillv. art.nrAS78L05ZTR-E1
VarumärkeDiodesZetex
0,838 kr
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS-artikelnummer 179-2036
Tillv. art.nrLM340S-12/NOPB
VarumärkeTexas Instruments
12,693 kr
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12 V 1A Fixed D2PAK (TO-263) Surface Mount 14.6 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS-artikelnummer 168-6545
Tillv. art.nrLM217MDT-TR
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2,782 kr
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1.2 → 37 V 200mA Adjustable DPAK Surface Mount 3 V - 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 155-5379
Tillv. art.nrLT337AT#PBF
VarumärkeAnalog Devices
29,428 kr
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-1.2 → -37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Negative -
RS-artikelnummer 100-0719
Tillv. art.nrLM338T/NOPB
VarumärkeTexas Instruments
16,038 kr
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1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
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