Overview
The MC7812BTG is a linear voltage regulator produced by onsemi, designed to provide a stable output voltage of 12 volts. This component is part of the MC78XX series, known for its reliability and performance in various electronic systems. The MC7812BTG is available in the TO-220 package, which is widely used for its thermal dissipation capabilities and ease of mounting on heat sinks.
This regulator is suitable for applications requiring a fixed voltage output with minimal noise and high stability. It features internal current limiting, thermal shutdown, and a short-circuit current limit, making it robust and reliable in diverse operating conditions.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (TJ = 25°C) | VO | 11.5 | 12 | 12.5 | Vdc |
| Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) | VO | 11.4 | 12 | 12.6 | Vdc |
| Line Regulation (TJ = 25°C) | Regline | - | - | 7.5 | mV |
| Load Regulation (TJ = 25°C) | Regload | - | - | 1.6 | mV |
| Quiescent Current | IB | 3.4 | - | 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 | - | - | 1.1 | 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 | - | - | -0.8 | mV/°C |
Key Features
- Internal Current Limiting: Protects the regulator from overcurrent conditions.
- Thermal Shutdown: Automatically shuts down the regulator in case of overheating.
- Short-Circuit Current Limit: Limits the output current to prevent damage during short-circuit conditions.
- Low Dropout Voltage: Ensures minimal voltage drop between the input and output, enhancing efficiency.
- High Ripple Rejection Ratio: Reduces the impact of input voltage noise on the output voltage.
- TO-220 Package: Provides good thermal dissipation and ease of mounting on heat sinks.
Applications
- Power Supplies: Used in fixed voltage power supplies where stability and low noise are crucial.
- Embedded Systems: Suitable for use in embedded systems requiring a stable voltage source.
- Industrial Control Systems: Applied in industrial control systems where reliable voltage regulation is necessary.
- Consumer Electronics: Used in various consumer electronic devices requiring stable DC voltage.
- Automotive Systems: Can be used in automotive systems where robust voltage regulation is required.
Q & A
- What is the output voltage of the MC7812BTG?
The output voltage of the MC7812BTG is 12 volts.
- What is the typical quiescent current of the MC7812BTG?
The typical quiescent current is 3.4 mA.
- What is the dropout voltage of the MC7812BTG at 1 A output current?
The dropout voltage is approximately 2.0 volts.
- Does the MC7812BTG have internal current limiting?
Yes, the MC7812BTG has internal current limiting to protect against overcurrent conditions.
- What is the package type of the MC7812BTG?
The MC7812BTG is available in the TO-220 package.
- What is the peak output current of the MC7812BTG?
The peak output current is 2.2 amps.
- Does the MC7812BTG have thermal shutdown protection?
Yes, it has thermal shutdown protection to prevent overheating.
- What is the ripple rejection ratio of the MC7812BTG?
The ripple rejection ratio is typically around 56 dB at 120 Hz.
- What is the operating temperature range of the MC7812BTG?
The operating junction temperature range is from -40°C to 125°C.
- What are some common applications of the MC7812BTG?
Common applications include power supplies, embedded systems, industrial control systems, consumer electronics, and automotive systems.
