The 5V-7905 Negative Voltage Regulator provides a stable -5V output from 12V-24V DC input, ideal for powering devices that require a negative voltage supply.
7905 Negative Voltage Regulator 5V 1.5A TO-220
The 5V-7905 Negative Voltage Regulator is an electronic component designed to provide a stable negative output voltage of -5V, typically used in power supply circuits for electronic systems that require negative voltage. It operates in a wide input voltage range, typically from +12V to +24V DC, and provides a constant negative 5V output for use in various applications.
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. The output current of this IC can go up to 1.5A, but the IC suffers from heavy heat loss hence a Heat sink is recommended for projects that consume more current. For example if the input voltage is 12V and you are consuming 1A, then (12-5) * 1 = 7W. This 7 Watts will be dissipated as heat.
Features:
- Fixed −5V output with tight tolerance options (AC and C versions).
- Output current capability up to 1.5A with internal current limiting and thermal shutdown.
- Short-circuit protection and Safe Operating Area (SOA) protection for rugged operation.
- Low quiescent current and good line/load regulation for stable operation.
- Low dropout voltage (typical 1.4V@1A).
- Wide operating and storage temperature ranges suitable for industrial use.
Specifications:
| Physical | |
| Case/Package: | TO-220 |
| Mount: | Through Hole |
| Number of Pins: | 3 |
| Technical | |
| Dropout Voltage: | 1.4 V |
| Max Input Voltage: | -35 V |
| Max Operating Temperature: | 150 °C |
| Max Output Current: | 1.5 A |
| Min Input Voltage: | -7 V |
| Min Operating Temperature: | 0 °C |
| Min Output Voltage: | -5 V |
| Nominal Output Voltage: | -5 V |
| Number of Channels: | 1 |
| Number of Outputs: | 1 |
| Number of Regulators: | 1 |
| Output Current: | 1.5 A |
| Output Type: | Fixed |
| Output Voltage: | -5 V |
| Polarity: | Negative |
| Power Supply Rejection Ratio (PSRR): | 60 dB |
| Quiescent Current: | 3 mA |
| Tolerance: | 10 % |
Pinout Diagram:
| Pin Number | Pin Name | Description |
| 1 | Ground (Gnd) | Unregulated Input Voltage |
| 2 | Input (V+) | Connected to Ground |
| 3 | Output (Vo) | Outputs Regulated -5V |
Why do we need Negative Voltage Regulators?
Negative voltage regulators are mainly used in Op-Amp and other circuits where a negative supply voltage is needed. In many cases where an Op-Amp is working in dual mode power supply a negative voltage will be regulated by these 79XX ICs. Also these IC’s will be able to source current into the ground rail instead of sinking it as normally.
Applications:
- Constant -5V output regulator to for op-amp signals
- Adjustable Output Regulator
- Current Limiter for certain applications
- Regulated Dual Supply
Documents:
| Datasheet | LM7905 |
| CAD Files | Download |