Overview
The L78M12ABV is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78MxxA series. This regulator is designed to provide local on-card regulation, eliminating the distribution problems associated with single point regulation. It is available in TO-220 and DPAK packages, making it versatile for various applications. The L78M12ABV is particularly useful in scenarios where a stable 12V output is required, and it features internal current limiting, thermal shutdown, and safe area protection, ensuring robust and reliable operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VO) | 11.75 - 12.25 | V |
| Output Current (IO) | Up to 0.5 A | A |
| Input Voltage (VI) | 14.5 - 27 V | V |
| Line Regulation (ΔVO) | 100 mV (VI = 14.5 to 30 V, IO = 200 mA) | mV |
| Load Regulation (ΔVO) | 240 mV (IO = 5 to 500 mA) | mV |
| Quiescent Current (Id) | 6 mA | mA |
| Dropout Voltage (Vd) | 2 V | V |
| Short Circuit Current (Isc) | 300 mA | mA |
| Operating Junction Temperature (TOP) | -40 to 125 °C | °C |
| Thermal Resistance Junction-Case (RthJC) | 5 °C/W (TO-220) | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | 50 °C/W (TO-220) | °C/W |
Key Features
- Output current up to 0.5 A
- Output voltage of 12 V with ± 2% tolerance
- Thermal overload protection
- Short circuit protection
- Output transition SOA protection
- Guaranteed operation in extended temperature range (-40 to 125 °C for AB version)
- Available in TO-220 and DPAK packages
Applications
The L78M12ABV is suitable for a wide range of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial control systems
- Power supplies for various electronic devices
- Local on-card regulation to eliminate single point regulation issues
Q & A
- What is the output voltage of the L78M12ABV?
The output voltage of the L78M12ABV is 12 V with a tolerance of ± 2%.
- What is the maximum output current of the L78M12ABV?
The maximum output current of the L78M12ABV is up to 0.5 A.
- What are the package options for the L78M12ABV?
The L78M12ABV is available in TO-220 and DPAK packages.
- Does the L78M12ABV have thermal protection?
- What is the operating temperature range for the L78M12ABV?
The operating temperature range for the L78M12ABV is -40 to 125 °C for the AB version.
- How does the L78M12ABV protect against short circuits?
The L78M12ABV has internal short circuit protection that limits the maximum current the circuit will pass.
- What is the dropout voltage of the L78M12ABV?
The dropout voltage of the L78M12ABV is 2 V.
- Can the L78M12ABV be used for adjustable voltage regulation?
- What is the recommended input bypass capacitor configuration for the L78M12ABV?
An input bypass capacitor should be selected to provide good high-frequency characteristics, especially if the regulator is connected to the power supply filter with long wire lengths or if the output load capacitance is large.
- What are some common applications for the L78M12ABV?
The L78M12ABV is commonly used in communications equipment, computers and peripherals, industrial control systems, and power supplies for various electronic devices.
