Overview
The MC7818ACTG 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, requiring no external components for basic operation.
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 | 17.3 | 18 | 18.7 | Vdc |
| Line Regulation (7.5 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA) | Regline | - | 0.5 | 1.3 | mV |
| Load Regulation (5.0 mA ≤ IO ≤ 1.0 A) | Regload | - | 1.0 | 4.0 | mV |
| Output Noise Voltage (10 Hz ≤ f ≤ 100 kHz) | 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 | - | -0.8 | - | mV/°C |
| Input Voltage Range | VI | 7.5 | - | 25 | Vdc |
| Power Dissipation | PD | - | Internally Limited | - | W |
| Thermal Resistance, Junction-to-Ambient | RJA | - | 65 | - | °C/W |
Key Features
- High Output Current: The MC7818ACTG 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 to protect the device from overcurrent and overheating conditions.
- No External Components Required: Basic operation does not require any external components, making it easy to integrate into various applications.
- Adjustable Voltage Capability: Can be used with external components to obtain adjustable voltages and currents.
- Low Dropout Voltage: A dropout voltage of 2.0 V at 1.0 A output current.
- Low Output Noise and Ripple Rejection: Provides a stable output voltage with minimal noise and high ripple rejection.
- Multiple Package Options: Available in surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages.
- AEC-Q100 Qualified: Suitable for automotive and other applications requiring unique site and control change requirements.
Applications
- Local, On-Card Regulation: Ideal for providing stable voltage regulation within electronic boards and cards.
- Automotive Systems: AEC-Q100 qualified, making it suitable for use in automotive electronics.
- Industrial Control Systems: Used in various industrial control and automation systems where stable voltage is crucial.
- Consumer Electronics: Found in consumer electronics such as audio equipment, medical devices, and other applications requiring reliable voltage regulation.
- Power Supplies: Used in linear power supplies to provide a stable output voltage.
Q & A
- What is the output voltage of the MC7818ACTG?
The output voltage of the MC7818ACTG is 18 volts with a tolerance of ±1% (17.4 V to 18.6 V) at 25°C.
- What is the maximum output current of the MC7818ACTG?
The MC7818ACTG can deliver output currents in excess of 1.0 A with adequate heatsinking.
- Does the MC7818ACTG require external components for basic operation?
No, the MC7818ACTG does not require any external components for basic operation.
- What are the internal protection features of the MC7818ACTG?
The device features internal current limiting, thermal shutdown, and safe-area compensation.
- What is the dropout voltage of the MC7818ACTG?
The dropout voltage is 2.0 V at 1.0 A output current.
- Is the MC7818ACTG suitable for automotive applications?
Yes, it is AEC-Q100 qualified and suitable for automotive and other applications requiring unique site and control change requirements.
- What are the available package options for the MC7818ACTG?
It is available in surface mount D2PAK-3, DPAK-3, and standard 3-lead transistor packages.
- What is the thermal resistance, junction-to-ambient, of the MC7818ACTG?
The thermal resistance, junction-to-ambient, is 65°C/W.
- How does the MC7818ACTG handle short circuit conditions?
The device has an internal short circuit current limit to protect against short circuit conditions.
- What is the average temperature coefficient of output voltage for the MC7818ACTG?
The average temperature coefficient of output voltage is -0.8 mV/°C.
