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 796-8433
Tillv. art.nrTPS7A4901DGNT
VarumärkeTexas Instruments
27,865 kr
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33 V 150mA Adjustable MSOP Surface Mount 3 V 36 V 8 - -40 °C +150 °C 1 Positive 2.5%
RS-artikelnummer 796-8439
Tillv. art.nrTPS7A3001DGNT
VarumärkeTexas Instruments
31,95 kr
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-33 V 200mA Adjustable MSOP Surface Mount -36 V -3 V 8 - -40 °C +150 °C 1 Negative 2.5%
RS-artikelnummer 921-6894
Tillv. art.nrLM317AEMP/NOPB
VarumärkeTexas Instruments
8,171 kr
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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 Positive ±1%
RS-artikelnummer 124-9986
Tillv. art.nrLM317LDR2G
VarumärkeON Semiconductor
0,78 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 686-9773
Tillv. art.nrL7824ABV
VarumärkeSTMicroelectronics
4,177 kr
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24 V 1A Fixed TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive 2%
RS-artikelnummer 145-6731
Tillv. art.nrLP2996MR/NOPB
VarumärkeTexas Instruments
13,117 kr
Each (In a Tube of 95)
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1.159 V, 1.259 V, 1.359 V 1.5A Fixed PSOP Surface Mount 2.2 V 5.5 V 8 - 0 °C +125 °C 1 Positive -
RS-artikelnummer 686-9476
Tillv. art.nrL78L08ABUTR
VarumärkeSTMicroelectronics
3,346 kr
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8 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-artikelnummer 516-5764
Tillv. art.nrMC78L12ACPG
VarumärkeON Semiconductor
4,074 kr
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12 V 100mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
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 817-5470
Tillv. art.nrTPS7A4001DGNT
VarumärkeTexas Instruments
25,188 kr
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1.175 90 V 50mA Adjustable MSOP Surface Mount 7 V 100 V 8 1.83W -40 °C +125 °C 1 Positive ±2.5%
RS-artikelnummer 300-344
Tillv. art.nrCSR604A
VarumärkeUnited Automation
214,66 kr
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230 V 6A Adjustable - Through Hole - 230 V 3 - 0 °C +70 °C - - -
RS-artikelnummer 189-1015
Tillv. art.nrLM217T
VarumärkeSTMicroelectronics
23,68 kr
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1.2 37 V 1.5A Adjustable TO-220 Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS-artikelnummer 688-9288
Tillv. art.nrMC78M05ACDTG
VarumärkeON Semiconductor
5,685 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 ±2%
RS-artikelnummer 145-2813
Tillv. art.nrMC78M05ACDTG
VarumärkeON Semiconductor
4,794 kr
Each (In a Tube of 75)
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5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS-artikelnummer 121-9161
Tillv. art.nrUA78M05CDCY
VarumärkeTexas Instruments
4,681 kr
Each (In a Tube of 80)
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-artikelnummer 122-0380
Tillv. art.nrAP7313-33SRG-7
VarumärkeDiodesZetex
0,912 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 102-3530
Tillv. art.nrL78S05CV
VarumärkeSTMicroelectronics
5,269 kr
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5 V 2A Fixed TO-220 Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-artikelnummer 102-1378
Tillv. art.nrMC7805CDTG
VarumärkeON Semiconductor
4,459 kr
Each (In a Tube of 75)
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5 V 1A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-artikelnummer 163-2476
Tillv. art.nrMC7805BD2TG
VarumärkeON Semiconductor
5,35 kr
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5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS-artikelnummer 122-0371
Tillv. art.nrAP7167-FNG-7
VarumärkeDiodesZetex
3,544 kr
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0.8 5 V 1.2A Adjustable DFN3030 Surface Mount 2.2 V 5.5 V 10 - -40 °C +85 °C 2 Positive ±3%
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