Overview
The MC7818BTG is a fixed-voltage regulator from onsemi, designed to provide a stable output voltage of 18 volts. This monolithic integrated circuit is part of the MC78XX series, which is widely used for local, on-card regulation in various electronic systems. The device is known for its high current capability, internal protection features, and ease of use, making it a reliable choice for a broad range of applications.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (TJ = 25°C) | VO | 17.4 | 18 | 18.6 | Vdc |
| Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) | VO | 17.1 | 18 | 18.9 | Vdc |
| Line Regulation (TJ = 25°C) | Regline | - | 0.5 | 1.3 | mV |
| Load Regulation (TJ = 25°C) | Regload | - | 1.4 | 35 | 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 MC7818BTG can deliver output currents in excess of 1.0 A with adequate heatsinking.
- Internal Protection: Features internal current limiting, thermal shutdown, and safe-area compensation for enhanced reliability.
- No External Components Required: No external components are necessary for operation, simplifying the design process.
- Fixed Output Voltage: Provides a stable output voltage of 18 volts with tolerances of 1.5%, 2%, or 4%.
- Package Options: Available in surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages.
- Automotive Grade: The NCV prefix indicates AEC-Q100 qualification and PPAP capability, making it suitable for automotive and other demanding applications.
Applications
The MC7818BTG is versatile and can be used in a variety of applications, including:
- Local, On-Card Regulation: Ideal for regulating voltage in compact electronic systems.
- Automotive Systems: Suitable for use in automotive electronics due to its AEC-Q100 qualification.
- Industrial Control Systems: Can be used in industrial control systems requiring stable voltage regulation.
- Consumer Electronics: Applicable in consumer electronics such as audio equipment, medical devices, and other voltage-sensitive applications.
Q & A
- What is the output voltage of the MC7818BTG?
The output voltage of the MC7818BTG is 18 volts with tolerances of 1.5%, 2%, or 4%. - What is the maximum output current of the MC7818BTG?
The MC7818BTG can deliver output currents in excess of 1.0 A with adequate heatsinking. - Does the MC7818BTG require external components for operation?
No, the MC7818BTG does not require external components for operation. - What are the internal protection features of the MC7818BTG?
The MC7818BTG features internal current limiting, thermal shutdown, and safe-area compensation. - What are the available package options for the MC7818BTG?
The MC7818BTG is available in surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages. - Is the MC7818BTG suitable for automotive applications?
Yes, the NCV prefix indicates AEC-Q100 qualification and PPAP capability, making it suitable for automotive and other demanding applications. - What is the dropout voltage of the MC7818BTG?
The dropout voltage of the MC7818BTG is 2.0 Vdc at IO = 1.0 A and TJ = 25°C. - What is the quiescent current of the MC7818BTG?
The quiescent current of the MC7818BTG is typically 3.3 mA. - How does the MC7818BTG handle short circuit conditions?
The MC7818BTG has a short circuit current limit of 0.2 A at TA = 25°C. - What is the average temperature coefficient of output voltage for the MC7818BTG?
The average temperature coefficient of output voltage for the MC7818BTG is -0.4 mV/°C.
