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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Omschrijving Prijs 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
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-5 V 100mA Fixed TO-92 Through Hole - -40 V dc 3 625mW -40 °C +125 °C 1 Negative -
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8 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
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FabrikantNew Japan Radio
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- - - - - - - - - - - - - -
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RS-stocknr. 208-8583
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5 V 1.5A Fixed SOT-23 Surface Mount - - 4 - - - 1 Positive -
RS-stocknr. 170-3500
FabrikantnummerMC78M18BTG
FabrikantON Semiconductor
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18 V 700mA Fixed TO-220 Through Hole - 35 V dc 3 5W -40 °C +125 °C 1 Positive -
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0,447 €
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RS-stocknr. 419-621
FabrikantnummerMAX15006AASA+
FabrikantMaxim Integrated
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3.3 V 50mA Fixed SOIC Surface Mount 4 V 40 V 8 - -40 °C +125 °C 1 Positive -
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RS-stocknr. 122-0373
FabrikantnummerAP7173-FNG-7
FabrikantDiodesZetex
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0.8 → 3.3 V 1.5A Adjustable DFN3030 Surface Mount -0.3 V 6 V 10 - -40 °C +150 °C 2 Positive ±2%
RS-stocknr. 163-2572
FabrikantnummerNCP4586DSN30T1G
FabrikantON Semiconductor
0,543 €
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3 V 200mA Fixed SOT-23 Surface Mount 1.7 V 6.5 V 5 - -40 °C +85 °C 1 Positive ±1%
RS-stocknr. 686-9559
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9 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 196-1456
FabrikantnummerL79L05ACD13TR
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-5 V 100mA Fixed SO Surface Mount - -35 V 8 - 0 °C +125 °C 2 Negative -
RS-stocknr. 188-9190
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0.9 → 36 V 400mA Adjustable VDFPN Surface Mount 4.5 V 36 V 10 - -40 °C +150 °C 1 - -
RS-stocknr. 186-9832
FabrikantnummerLM317MBDTRKG
FabrikantON Semiconductor
0,424 €
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1.2 → 37 V 500mA Adjustable DPAK Surface Mount 3.1 V 40 V dc 3 + Tab - -40 °C +125 °C 1 Positive -
RS-stocknr. 686-9353
FabrikantnummerL7824CD2T-TR
0,485 €
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24 V 1.5A Fixed D2PAK Surface Mount - 40 V 3 - 0 °C +150 °C 1 Positive -
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RS-stocknr. 208-8566
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0,334 €
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1.2 V → 32 V V 100mA Adjustable SOIC Surface Mount - - 8 - - - 1 Positive -
RS-stocknr. 298-8615
FabrikantnummerL7905CV
0,50 €
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FabrikantnummerMAX4210EEUA+
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