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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Description Price 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 Stock No. 191-3635
Mfr. Part No.MAX15462BATA+T
€2.058
Each (In a Pack of 5)
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5 V 300mA Fixed TDFN Surface Mount 4.5 V 42 V 8 - -40 °C +125 °C 1 Negative -
RS Stock No. 191-4001
Mfr. Part No.MAX889SESA+
€2.668
Each (In a Tube of 100)
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- 200 (Typ.)mA Adjustable SOIC Surface Mount 2.7 V 5.5 V 8 - -40 °C +85 °C 1 Negative -
RS Stock No. 191-4281
Mfr. Part No.MAX4210EEUA+
€1.612
Each (In a Tube of 50)
units
80 mV 500µA - μMAX Surface Mount 4 V 28 V 8 - -40 °C +85 °C 1 Positive ±1.5%
RS Stock No. 191-4709
Mfr. Part No.MAX1708EEE+
€8.26
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5.2 V 300µA Adjustable QSOP Surface Mount 0.7 V 6 V 16 - -40 °C +85 °C 1 Positive -
RS Stock No. 191-6825
Mfr. Part No.MAX1044ESA+
€2.97
Each (In a Pack of 2)
units
- 0.02 (Typ.)A - SO Surface Mount 1.5 V 10 V 8 - -40 °C +85 °C 1 Negative -
RS Stock No. 190-4480
Mfr. Part No.MAX1510ETB+T
€2.598
Each (On a Reel of 2500)
units
0.5 → 1.5 V 2A Adjustable TDFN Surface Mount 1.1 V 3.6 V 10 - -40 °C +85 °C 1 - -
RS Stock No. 191-3217
Mfr. Part No.MAX664ESA+
€3.104
Each (In a Tube of 100)
units
5 V, 1.3 → 16 V 40mA Adjustable, Fixed SO Surface Mount 2.2 V 16.5 V 8 - -40 °C +85 °C 1 - -
RS Stock No. 190-0334
Mfr. Part No.MAX5024LASA+
€3.512
Each (In a Pack of 5)
units
5 V 150mA Adjustable, Fixed SOIC Surface Mount 6.5 V 65 V 8 1.538W -40 °C +125 °C 1 Positive -
RS Stock No. 190-7963
Mfr. Part No.MAX15007AASA+
€2.296
Each (In a Pack of 5)
units
3.3 V 50mA Fixed SO Surface Mount 4 V 40 V 8 - -40 °C +125 °C 1 - -
RS Stock No. 191-3245
Mfr. Part No.ICL7662CBA+T
€2.25
Each (On a Reel of 2500)
units
-2.5 V 0.02 (Typ.)A Adjustable SO Surface Mount ±4.5 V ±20 V 8 - 0 °C +70 °C 1 Negative -
RS Stock No. 191-4684
Mfr. Part No.MAX1627ESA+
€4.116
Each (In a Pack of 5)
units
5.15 V 50µA Adjustable SOIC Surface Mount 3 V 16.5 V 8 - -40 °C +85 °C 1 Positive -
RS Stock No. 191-3255
Mfr. Part No.MAX1722EZK+T
€1.682
Each (On a Reel of 2500)
units
2 → 5.5 V 150mA Adjustable TSOT Surface Mount 0.91 V 5.5 V 5 - -40 °C +85 °C 1 - ±1%
RS Stock No. 191-5263
Mfr. Part No.MAX1792EUA33+
€2.16
Each (In a Tube of 50)
units
3.3 V, 1.25 → 5 V 500mA Adjustable, Fixed μMax Surface Mount 2.5 V 5.5 V 8 1.3W -40 °C +85 °C 1 - ±1%
RS Stock No. 191-5264
Mfr. Part No.MAX1795EUA+
€5.058
Each (In a Tube of 50)
units
3.3 V, 5 V 180mA Fixed μMax Surface Mount 1 V 5.5 V 8 - -40 °C +85 °C 1 - -
RS Stock No. 190-4474
Mfr. Part No.MAX15006BASA+
€1.569
Each (In a Tube of 100)
units
5 V 50mA Fixed SO Surface Mount 4 V 40 V 8 - -40 °C +125 °C 1 - -
RS Stock No. 191-3404
Mfr. Part No.MAX664ESA+
€4.56
Each (In a Pack of 2)
units
5 V, 1.3 → 16 V 40mA Adjustable, Fixed SO Surface Mount 2.2 V 16.5 V 8 - -40 °C +85 °C 1 - -
RS Stock No. 190-4485
Mfr. Part No.MAX1615EUK+T
€1.276
Each (On a Reel of 2500)
units
3.3 V, 5 V 30mA Adjustable SOT-23 Surface Mount 4 V 28 V 5 - -40 °C +85 °C 1 - ±2%
RS Stock No. 191-5255
Mfr. Part No.MAX15303AA00+CM
€4.71
Each (In a Tube of 50)
units
0.5 → 5.25 V 6A Adjustable TQFN Surface Mount 4.5 V 14 V 40 - -40 °C +85 °C 1 - ±1.25%
RS Stock No. 165-9728
Mfr. Part No.MAX5024LASA+
€2.217
Each (In a Tube of 100)
units
5 V 150mA Adjustable, Fixed SOIC Surface Mount 6.5 V 65 V 8 1.538W -40 °C +125 °C 1 Positive -
RS Stock No. 189-6917
Mfr. Part No.MAX15006AASA+
€1.432
Each (In a Tube of 100)
units
3.3 V 50mA Fixed SOIC Surface Mount 4 V 40 V 8 - -40 °C +125 °C 1 Positive -