Overview
The MC7918CTG is a fixed output negative voltage regulator from onsemi, part of the MC7900 series. This regulator is designed to provide a stable negative output voltage and is complementary to the popular MC7800 series. The MC7918CTG is available in a TO-220 package and is capable of delivering up to 1 A of output current. It features current limiting, thermal shutdown, and safe-area compensation, making it robust under various operating conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage (TJ = +25°C) | -17.7 | -18 | -18.3 | Vdc |
| Line Regulation (TJ = +25°C, IO = 100 mA) | -10.5 | - | -11 | Vdc |
| Load Regulation (TJ = +25°C, 5.0 mA ≤ IO ≤ 1.5 A) | -26 | - | -9.0 | mV |
| Input Bias Current (TJ = +25°C) | -4.4 | - | -8.0 | mA |
| Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) | -90 | - | - | μV |
| Ripple Rejection (IO = 20 mA, f = 120 Hz) | -60 | - | - | dB |
| Dropout Voltage (IO = 1.0 A, TJ = +25°C) | -1.3 | - | - | Vdc |
| Average Temperature Coefficient of Output Voltage | -1.0 | - | - | mV/°C |
Key Features
- Fixed output voltage of -18 V
- Output current up to 1 A
- Current limiting and thermal shutdown for protection
- Safe-area compensation for robust operation
- Low dropout voltage of 1.3 V
- High ripple rejection of 60 dB at 120 Hz
- Low output noise voltage
- TO-220 package for easy heatsinking
Applications
- Power supplies requiring negative voltage regulation
- Industrial control systems
- Telecommunication equipment
- Medical devices
- Automotive systems requiring stable negative voltages
Q & A
- What is the output voltage of the MC7918CTG?
The output voltage of the MC7918CTG is -18 V.
- What is the maximum output current of the MC7918CTG?
The maximum output current of the MC7918CTG is 1 A.
- What are the key protection features of the MC7918CTG?
The MC7918CTG features current limiting and thermal shutdown for protection.
- What is the dropout voltage of the MC7918CTG?
The dropout voltage of the MC7918CTG is 1.3 V.
- What is the ripple rejection of the MC7918CTG at 120 Hz?
The ripple rejection of the MC7918CTG at 120 Hz is 60 dB.
- What package type is the MC7918CTG available in?
The MC7918CTG is available in a TO-220 package.
- What are some common applications of the MC7918CTG?
Common applications include power supplies, industrial control systems, telecommunication equipment, medical devices, and automotive systems.
- How does the MC7918CTG handle thermal issues?
The MC7918CTG includes thermal shutdown to protect against overheating.
- What is the input bias current of the MC7918CTG?
The input bias current of the MC7918CTG is typically 4.4 mA to 8.0 mA.
- What is the average temperature coefficient of the output voltage?
The average temperature coefficient of the output voltage is -1.0 mV/°C.
