Overview
The MC7808CT is a fixed-voltage regulator from onsemi, designed to provide a stable output voltage of 8 volts. This monolithic integrated circuit is part of the 78XX series, known for its reliability and versatility in various electronic applications. The MC7808CT is suitable for local, on-card regulation and can deliver output currents in excess of 1.0 A with adequate heatsinking. It features internal current limiting, thermal shutdown, and safe-area compensation, making it a robust choice for power supply systems.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (TJ = 25°C) | VO | 7.7 | 8.0 | 8.3 | Vdc |
| Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) | VO | 7.6 | 8.0 | 8.4 | Vdc |
| Line Regulation (TJ = 25°C) | Regline | - | 1.7 | 6.0 | mV |
| Load Regulation (TJ = 25°C) | Regload | - | 1.4 | 160 | mV |
| Quiescent Current | IB | 3.3 | - | 8.0 | mA |
| Dropout Voltage (IO = 1.0 A, TJ = 25°C) | VI - VO | - | - | 2.0 | Vdc |
| Output Noise Voltage (TA = 25°C) | Vn | - | - | 10 | μV/VO |
| Output Resistance (f = 1.0 kHz) | rO | - | - | 0.9 | mΩ |
| Short Circuit Current Limit (TA = 25°C) | ISC | - | - | 0.2 | A |
| Peak Output Current (TJ = 25°C) | Imax | - | - | 2.2 | A |
| Average Temperature Coefficient of Output Voltage | TCVO | - | - | -0.4 | mV/°C |
Key Features
- High Output Current: The MC7808CT can deliver output currents in excess of 1.0 A with proper heatsinking.
- Internal Current Limiting: Built-in current limiting protects the device from overcurrent conditions.
- Thermal Shutdown: Automatic thermal shutdown prevents the device from overheating.
- Safe-Area Compensation: Ensures stable operation over a wide range of input and output conditions.
- No External Components Required: The regulator can operate without external components for basic applications.
- Adjustable Voltage and Current Capability: Can be used with external components to achieve adjustable voltages and currents.
Applications
- Local, On-Card Regulation: Ideal for providing stable voltage on PCBs.
- Power Supply Systems: Used in various power supply designs requiring a stable 8V output.
- Industrial Control Systems: Suitable for use in industrial control and automation systems.
- Consumer Electronics: Found in consumer electronics such as audio equipment and other devices requiring stable voltage regulation.
Q & A
- What is the output voltage of the MC7808CT?
The output voltage of the MC7808CT is 8 volts.
- What is the maximum output current of the MC7808CT?
The MC7808CT can deliver output currents in excess of 1.0 A with adequate heatsinking.
- Does the MC7808CT require external components to operate?
No, the MC7808CT can operate without external components for basic applications, but external components can be used to achieve adjustable voltages and currents.
- What are the key protective features of the MC7808CT?
The key protective features include internal current limiting, thermal shutdown, and safe-area compensation.
- What is the dropout voltage of the MC7808CT?
The dropout voltage of the MC7808CT is 2.0 Vdc at an output current of 1.0 A.
- What is the quiescent current of the MC7808CT?
The quiescent current of the MC7808CT is typically 3.3 mA to 8.0 mA.
- How does the MC7808CT handle short circuit conditions?
The MC7808CT has a built-in short circuit current limit of 0.2 A at 25°C.
- What is the output noise voltage of the MC7808CT?
The output noise voltage of the MC7808CT is typically 10 μV/VO at 25°C.
- What is the output resistance of the MC7808CT?
The output resistance of the MC7808CT is typically 0.9 mΩ at 1 kHz.
- What are some common applications of the MC7808CT?
The MC7808CT is commonly used in local, on-card regulation, power supply systems, industrial control systems, and consumer electronics.
