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Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. In our case the 7905 IC is an negative 5V regulator, meaning it provides -5V as output. The name 7905 signifies two meaning, “79” means that it is a negative voltage regulator and “05” means that it provides 5V as output. So our 7905 will provide a -5V output voltage.
This blog will introduce LM7905 systematically from its features, pinout to its specifications, applications, also including LM7905 datasheet and so much more.
The following figure is the diagram of LM7905 pinout.
LM7905 Pinout
| Pin Number | Pin Name | Description |
| 1 | Ground (Gnd) | Unregulated Input Voltage |
| 2 | Input (V+) | Connected to Ground |
| 3 | Output (Vo) | Outputs Regulated -5V |
LM7806, LM7809, LM7812, LM317, LM7805, LM7912, LM117V33, XC6206P332MR.
This is a typical application circuit of the 7905 IC. We just need two capacitors of vale 2.2uf and 1uf to get this IC working.
The input capacitor 2.2uF is a ceramic capacitor that deals with input inductance problem and the output capacitor 1uF is also a ceramic capacitor that adds to the stability of the circuit. These capacitors should be placed close to the terminals for them to work effectively. Also they should be of ceramic type, since ceramic capacitors are faster than electrolytic.
LM7905 Circuit Diagram
High Stability 1 Amp Regulator
The following diagram shows the LM7905 package.
LM7905 Package
| Manufacturer: | Texas Instruments |
| Subcategory: | Other Regulators |
| Operating Temperature TJ-Max: | 125 °C |
| Output Voltage1-Nom: | -5 V |
| Package Body Material: | PLASTIC/EPOXY |
| Technology: | BIPOLAR |
| Voltage Tolerance-Max: | 5% |
Texas Instruments Incorporated designs and manufactures analog technologies, digital signal processing (DSP) and microcontroller (MCU) semiconductors. TI is a leader in semiconductor solutions for analog and digital embedded and applications processing. A global semiconductor company, TI innovates through design, sales and manufacturing operations in more than 30 countries.
You can download LM7905 datasheet from the link given below:
Note: Please check their parameters and pin configuration before replacing them in your circuit.
A voltage regulator is a circuit that creates and maintains a fixed output voltage, irrespective of changes to the input voltage or load conditions. Voltage regulators (VRs) keep the voltages from a power supply within a range that is compatible with the other electrical components.
There are three types of Switching voltage regulators: Step up, Step down, and Inverter voltage regulators.
A voltage regulator is basically an integrated circuit that has several transistors within it, while a mosfet is exactly a single transistor. A MOSFET is a single transistor that will be able to provide a regulated voltage if used inside of a whole voltage regulator circuit (or IC).
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