Overview
The L78L12ABD-TR is a three-terminal positive voltage regulator from STMicroelectronics. This component is part of the L78L series, which is known for its robust design, featuring internal current limiting and thermal shutdown, making it essentially indestructible. The L78L12ABD-TR is designed to provide a fixed output voltage of 12V and can deliver up to 100 mA of output current, making it suitable for a wide range of applications including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25 °C | 11.5 | 12 | 12.5 | V |
| Output Voltage (VO) | IO = 1 to 40 mA, VI = 14.5 to 27 V | 11.4 | 12 | 12.6 | V |
| Line Regulation (∆VO) | VI = 14.5 to 27 V, TJ = 25 °C | - | - | 250 mV | mV |
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25 °C | - | - | 100 mV | mV |
| Quiescent Current (Id) | TJ = 25 °C | - | 6 mA | - | mA |
| Dropout Voltage (Vd) | - | - | - | 1.7 V | V |
| Input Voltage (VI) | VO = 12 to 15 V | - | - | 35 V | V |
| Operating Junction Temperature (TOP) | -40 to 125 °C | -40 | - | 125 | °C |
| Storage Temperature (TSTG) | - | -65 | - | 150 | °C |
Key Features
- Output current up to 100 mA
- Fixed output voltage of 12V
- Internal current limiting and thermal shutdown for robust operation
- Short-circuit protection
- No external components required
- Available in either ± 4% (A) or ± 8% (C) selection
- Low quiescent current and low noise
Applications
The L78L12ABD-TR is suitable for various applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems associated with single-point regulation.
- Replacement for Zener diode/resistor combinations, offering improvements in quiescent current and noise.
- Use with power pass elements to create high-current voltage regulators.
- Industrial and commercial power supply systems.
Q & A
- What is the output voltage of the L78L12ABD-TR?
The output voltage of the L78L12ABD-TR is 12V.
- What is the maximum output current of the L78L12ABD-TR?
The maximum output current is up to 100 mA.
- Does the L78L12ABD-TR have built-in protection features?
- What is the operating temperature range of the L78L12ABD-TR?
The operating temperature range is -40 to 125 °C.
- Do I need external components to use the L78L12ABD-TR?
No, the L78L12ABD-TR does not require external components.
- What are the typical applications of the L78L12ABD-TR?
It is used for local or on-card regulation, Zener diode/resistor combination replacement, and in industrial and commercial power supply systems.
- What is the quiescent current of the L78L12ABD-TR?
The quiescent current is typically 6 mA at 25 °C.
- What is the dropout voltage of the L78L12ABD-TR?
The dropout voltage is 1.7 V.
- What is the input voltage range for the L78L12ABD-TR?
The input voltage range is up to 35 V for VO = 12 to 15 V.
- Is the L78L12ABD-TR available in different tolerance options?
