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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RS-artikelnummer 751-5183
Tillv. art.nrZLDO1117G33TA
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3,669 kr
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3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
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Tillv. art.nrZLDO1117G33TA
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3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
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Tillv. art.nrAS78L05ZTR-E1
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS-artikelnummer 885-5432
Tillv. art.nrAZ1117H-5.0TRE1
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2,897 kr
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5 V 1A Fixed SOT-223 Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
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Tillv. art.nrAS78L05ZTR-E1
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS-artikelnummer 122-3393
Tillv. art.nrAZ1117H-5.0TRE1
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0,892 kr
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5 V 1A Fixed SOT-223 Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS-artikelnummer 751-3067
Tillv. art.nrAP7313-33SRG-7
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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 751-3102
Tillv. art.nrAP7333-33SAG-7
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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%
RS-artikelnummer 922-7645
Tillv. art.nrZMR500FTA
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3,73 kr
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5 V 50mA Fixed SOT-23 Surface Mount 7 V 25 V 3 0.5W -55 °C +125 °C 1 Positive -
RS-artikelnummer 122-0371
Tillv. art.nrAP7167-FNG-7
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3,898 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%
RS-artikelnummer 155-080
Tillv. art.nrZMR500FTA
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6,917 kr
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5 V 50mA Fixed SOT-23 Surface Mount 7 V 25 V 3 0.5W -55 °C +125 °C 1 Positive -
RS-artikelnummer 122-0380
Tillv. art.nrAP7313-33SRG-7
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0,78 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 922-8317
Tillv. art.nrAP7333-33SAG-7
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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%
RS-artikelnummer 751-3027
Tillv. art.nrAP7167-FNG-7
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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%
RS-artikelnummer 122-0373
Tillv. art.nrAP7173-FNG-7
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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-artikelnummer 710-6278
Tillv. art.nrAP78L12YG-13
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12 V 100mA Fixed SOT-89 Surface Mount 14.5 V 27 V 3 - -20 °C +85 °C 1 Positive ±5%
RS-artikelnummer 122-1247
Tillv. art.nrZLDO1117K50TC
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1,618 kr
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5 V 1A Fixed TO-252 Surface Mount 2.7 V 18 V 3 - -40 °C +125 °C 1 Positive 2%
RS-artikelnummer 751-3051
Tillv. art.nrAP7313-18SAG-7
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1.8 V 150mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS-artikelnummer 122-0374
Tillv. art.nrAP7217D-12YG-13
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1.2 V 600mA Fixed SOT-89 Surface Mount 2.5 V 5.5 V 3 - -40 °C +125 °C 1 Positive -
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3 V 300mA Fixed SOT-25 Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%