Overview
The L78L12ABZ is a three-terminal positive voltage regulator from STMicroelectronics. It is part of the L78L series, which is known for its robust design, featuring internal current limiting and thermal shutdown, making these regulators essentially indestructible. This component is designed to provide a stable output voltage of 12V and can be used as a replacement for Zener diode/resistor combinations, offering improvements such as lower quiescent current and lower noise.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25 °C | 11.1 | 12 | 12.9 | V |
| Output Current (IO) | Up to 100 mA | mA | |||
| Line Regulation (∆VO) | VI = 14.5 to 27 V, TJ = 25 °C | 250 | mV | ||
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25 °C | 100 | mV | ||
| Quiescent Current (Id) | TJ = 25 °C | 6.5 | mA | ||
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25 °C | 80 | µV | ||
| Supply Voltage Rejection (SVR) | VI = 15 to 25 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C | 37 | 42 | dB | |
| Dropout Voltage (Vd) | 1.7 | V |
Key Features
- Internal current limiting and thermal shutdown for enhanced reliability and protection.
- No external components required for operation.
- Low quiescent current and low noise output.
- Available in various output voltages, including 12V for the L78L12ABZ model.
- Short-circuit protection and thermal overload protection.
- Can be used as a replacement for Zener diode/resistor combinations.
- Compact packaging options including TO-92, SO-8, and SOT-89.
Applications
The L78L12ABZ is suitable for a wide range of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems associated with single-point regulation.
- Use with power pass elements to create high-current voltage regulators.
- General-purpose voltage regulation in electronic devices.
- Replacement for Zener diode/resistor combinations in existing designs.
Q & A
- What is the output voltage of the L78L12ABZ?
The output voltage of the L78L12ABZ is 12V.
- What is the maximum output current of the L78L12ABZ?
The maximum output current is up to 100 mA.
- Does the L78L12ABZ require external components for operation?
No, the L78L12ABZ does not require external components for operation.
- What are the key protection features of the L78L12ABZ?
The key protection features include internal current limiting, thermal shutdown, and short-circuit protection.
- What are the typical quiescent current and output noise voltage of the L78L12ABZ?
The typical quiescent current is 6.5 mA, and the output noise voltage is 80 µV.
- What is the dropout voltage of the L78L12ABZ?
The dropout voltage is 1.7 V.
- Can the L78L12ABZ be used as a replacement for Zener diode/resistor combinations?
- What are the available packaging options for the L78L12ABZ?
The available packaging options include TO-92, SO-8, and SOT-89.
- What are some common applications of the L78L12ABZ?
- What is the supply voltage rejection of the L78L12ABZ?
The supply voltage rejection is typically 37 to 42 dB.
