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 Package Type Output 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. 166-1182
Mfr. Part No.TLE4286GHTSA1
BrandInfineon
PHP27.985
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5 V 15mA SCT-595 Fixed Surface Mount 6.2 V 42 V 5 - -40 °C +150 °C 1 Positive 4%
RS Stock No. 906-3047
Mfr. Part No.TLE4285GHTSA1
BrandInfineon
PHP44.636
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5 V 15mA SCT-595 Fixed Surface Mount 6 V 45 V 5 - -40 °C +150 °C 1 Positive 4%
RS Stock No. 110-7423
Mfr. Part No.TLE4286GHTSA1
BrandInfineon
PHP36.256
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5 V 15mA SCT-595 Fixed Surface Mount 6.2 V 42 V 5 - -40 °C +150 °C 1 Positive 4%
RS Stock No. 145-9664
Mfr. Part No.IFX27001TFV50ATMA1
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PHP25.301
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5 V 1A TO-252 Fixed Surface Mount 13.5 V 40 V 3 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 857-8558
Mfr. Part No.IFX78M05ABTFATMA1
BrandInfineon
PHP11.54
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5 V 500mA TO-252 Fixed Surface Mount -0.3 V 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 857-8551
Mfr. Part No.IFX7805ABTCATMA1
BrandInfineon
PHP19.276
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5 V 10mA D2PAK (TO-263) Fixed Surface Mount -0.3 V 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 857-8554
Mfr. Part No.IFX7805ABTFATMA1
BrandInfineon
PHP10.579
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5 V 10mA TO-252 Fixed Surface Mount -0.3 V 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 178-7404
Mfr. Part No.TLE4285GHTSA1
BrandInfineon
PHP22.688
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5 V 15mA SCT-595 Fixed Surface Mount 6 V 45 V 5 - -40 °C +150 °C 1 Positive 4%
RS Stock No. 827-5136
Mfr. Part No.IFX27001TFV50ATMA1
BrandInfineon
PHP42.30
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5 V 1A TO-252 Fixed Surface Mount 13.5 V 40 V 3 - -40 °C +125 °C 1 Positive ±3%