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 298-8592
Tillv. art.nrL78M05CV
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5 V 500mA Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
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15 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS-artikelnummer 169-8944
Tillv. art.nrTS78L05CT A3G
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5 V 150mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 168-6799
Tillv. art.nrL78L05ACUTR
VarumärkeSTMicroelectronics
1,283 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 921-6910
Tillv. art.nrLM340MP-5.0/NOPB
VarumärkeTexas Instruments
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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 157-8360
Tillv. art.nrLT1033CT#PBF
VarumärkeAnalog Devices
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-1.2 → -32 V 3A Adjustable TO-220 Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS-artikelnummer 122-0380
Tillv. art.nrAP7313-33SRG-7
VarumärkeDiodesZetex
0,544 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 686-9022
Tillv. art.nrL78S18CV
VarumärkeSTMicroelectronics
7,352 kr
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18 V 2A Fixed TO-220 Through Hole 21 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-artikelnummer 163-2476
Tillv. art.nrMC7805BD2TG
VarumärkeON Semiconductor
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5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
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Tillv. art.nrL78M05CV
VarumärkeSTMicroelectronics
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5 V 500mA Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-artikelnummer 922-8317
Tillv. art.nrAP7333-33SAG-7
VarumärkeDiodesZetex
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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%
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Tillv. art.nrUA78M05CDCY
VarumärkeTexas Instruments
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
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10 V 2A Fixed TO-220 Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
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Tillv. art.nrNCV4274AST33T3G
VarumärkeON Semiconductor
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3.3 V 400mA Fixed SOT-223 Surface Mount 4.5 V 40 V 3+Tab - -40 °C +150 °C 1 Positive 2%
RS-artikelnummer 655-644
Tillv. art.nrCSR2-15E
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230 V 15A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS-artikelnummer 748-8772
Tillv. art.nrNCP4681DSQ33T1G
VarumärkeON Semiconductor
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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 688-9288
Tillv. art.nrMC78M05ACDTG
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5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
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1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
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VarumärkeTexas Instruments
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12 V 100mA Fixed SOIC Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS-artikelnummer 145-9195
Tillv. art.nrL78S18CV
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18 V 2A Fixed TO-220 Through Hole 21 V 35 V 3 - 0 °C +150 °C 1 Positive -
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