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庫存編號 772-6645
製造零件編號UPC1093T-E1-AZ
HK$3.549
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36 V 150mA SOT-89 Adjustable Surface Mount 2.44 V 2.55 V 3 2W -20 °C +85 °C 1 Positive ±2%
RS庫存編號 181-3675
製造零件編號RTKA2108502H00000BU
HK$1,422.33
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- - - - - - - - - - - - - -
RS庫存編號 181-3670
製造零件編號RAA2109252GLG#AG0
HK$379.279
Each (In a Tray of 40)
單位
0.6 → 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3742
製造零件編號RAA2108502GLG#AG0
HK$453.51
單位
0.6 → 5 V 50A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3676
製造零件編號RTKA2108702H00000BU
HK$1,479.18
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- - - - - - - - - - - - - -
RS庫存編號 181-3673
製造零件編號RTKA2108252H00000BU
HK$1,422.33
單位
- - - - - - - - - - - - - -
RS庫存編號 181-3672
製造零件編號RAA2108702GLG#AG0
HK$637.675
Each (In a Tray of 20)
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0.6 → 5 V 70A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3735
製造零件編號RAA2108252GLG#AG0
HK$291.13
單位
0.6 → 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3744
製造零件編號RAA2108702GLG#AG0
HK$671.14
單位
0.6 → 5 V 70A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3739
製造零件編號RAA2109252GLG#AG0
HK$429.69
單位
0.6 → 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3671
製造零件編號RAA2108502GLG#AG0
HK$422.028
Each (In a Tray of 20)
單位
0.6 → 5 V 50A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3677
製造零件編號RTKA2109252H00000BU
HK$1,720.94
單位
- - - - - - - - - - - - - -
RS庫存編號 181-3668
製造零件編號RAA2108252GLG#AG0
HK$255.633
Each (In a Tray of 36)
單位
0.6 → 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3674
製造零件編號RTKA2108332H00000BU
HK$1,166.20
單位
- - - - - - - - - - - - - -
RS庫存編號 181-3737
製造零件編號RAA2108332GLG#AG0
HK$344.48
單位
0.6 → 5 V 33A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS庫存編號 181-3669
製造零件編號RAA2108332GLG#AG0
HK$302.542
Each (In a Tray of 36)
單位
0.6 → 5 V 33A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%