Overview
The L78M05ABV is a precision 500 mA linear voltage regulator produced by STMicroelectronics. This device is part of the L78MxxA series, which offers fixed output voltages ranging from 5V to 24V. The L78M05ABV specifically provides a stable 5V output voltage, making it suitable for a wide range of applications including local on-card regulation and power distribution systems. It is available in TO-220 and DPAK packages, ensuring versatility in design and implementation.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 4.9 | 5 | 5.1 | V |
| Output Current (IO) | - | - | 500 | mA |
| Input Voltage (VI) for VO = 5V | - | - | 35 | V |
| Line Regulation (ΔVO) | - | - | 100 mV | - |
| Load Regulation (ΔVO) | - | - | 100 mV | - |
| Quiescent Current (Id) | - | 6 | - | mA |
| Dropout Voltage (Vd) | - | - | 2 | V |
| Short Circuit Current (Isc) | - | - | 300 | mA |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °C |
| Storage Temperature Range (TSTG) | -65 | - | 150 | °C |
Key Features
- Output Current: Up to 500 mA.
- Output Voltage Tolerance: ±2%.
- Thermal Overload Protection: Shuts down the circuit in case of excessive power overload.
- Short Circuit Protection: Limits the maximum current to prevent damage.
- Output Transition SOA Protection: Reduces output short-circuit as the voltage across the pass transistor increases.
- Internal Current Limiting: Prevents excessive current draw.
- Low Quiescent Current: 6 mA typical.
- High Ripple Rejection Ratio: Ensures stable output voltage.
Applications
The L78M05ABV is suitable for various applications, including:
- Local On-Card Regulation: Provides stable voltage regulation for components on the same board.
- Power Distribution Systems: Used in power supply systems to regulate voltage.
- Industrial and Consumer Electronics: Suitable for use in a wide range of electronic devices requiring stable 5V power supply.
Q & A
- What is the output voltage of the L78M05ABV?
The output voltage of the L78M05ABV is 5V with a tolerance of ±2%.
- What is the maximum output current of the L78M05ABV?
The maximum output current is 500 mA.
- What type of protection does the L78M05ABV have?
The device features thermal overload protection, short circuit protection, and output transition SOA protection.
- What are the typical quiescent current and dropout voltage of the L78M05ABV?
The typical quiescent current is 6 mA, and the dropout voltage is 2 V.
- What are the operating and storage temperature ranges for the L78M05ABV?
The operating junction temperature range is -40°C to 125°C, and the storage temperature range is -65°C to 150°C.
- What packages are available for the L78M05ABV?
The device is available in TO-220 and DPAK packages.
- How does the L78M05ABV protect against short circuits?
The device has internal short circuit protection that limits the maximum current to prevent damage.
- What is the thermal resistance junction-case (RthJC) for the TO-220 package?
The thermal resistance junction-case (RthJC) for the TO-220 package is 5°C/W.
- Can the L78M05ABV be used with external components to obtain adjustable voltage and currents?
Yes, although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents.
- What is the recommended practice for bypassing the regulator input?
It is recommended to bypass the regulator input with a capacitor if the regulator is connected to the power supply filter with long wire lengths or if the output load capacitance is large.
