Overview
The L78L15ABZ is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78L series. These regulators are designed to be highly robust, featuring internal current limiting and thermal shutdown, making them essentially indestructible. With adequate heat-sinking, they can deliver up to 100 mA of output current. The L78L series is intended for use in a wide range of applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation. They can also be used with power pass elements to create high-current voltage regulators and as replacements for Zener diode/resistor combinations, offering improvements in quiescent current and noise reduction.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage | 13.8 | 15 | 16.2 | V |
| Output Current | 100 | mA | ||
| Line Regulation (VI = 17.5 to 30 V, TJ = 25 °C) | 300 mV | |||
| Load Regulation (IO = 1 to 100 mA, TJ = 25 °C) | 100 mV | |||
| Quiescent Current (TJ = 25 °C) | 6 | 6.5 | mA | |
| Output Noise Voltage (B = 10 Hz to 100 kHz, TJ = 25 °C) | 80 µV | |||
| Supply Voltage Rejection (VI = 15 to 25 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C) | 36 to 42 dB | |||
| Dropout Voltage | 1.7 V | |||
| Operating Temperature Range | 0 | 125 | °C |
Key Features
- Output current up to 100 mA
- Output voltages of 3.3, 5, 6, 8, 9, 10, 12, 15, 18, 24 V
- Thermal overload protection and short-circuit protection
- No external components required
- Available in either ± 4% (A) or ± 8% (C) selection
- Internal current limiting and thermal shutdown
- Low quiescent current and low noise
Applications
The L78L15ABZ is suitable for a variety of applications, including:
- Local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
- Use with power pass elements to create high-current voltage regulators.
- Replacement for Zener diode/resistor combinations, offering improvements in quiescent current and noise reduction.
- Industrial and commercial power supply systems.
Q & A
- What is the maximum output current of the L78L15ABZ?
The maximum output current is up to 100 mA.
- What are the available output voltages for the L78L series?
The available output voltages are 3.3, 5, 6, 8, 9, 10, 12, 15, 18, and 24 V.
- Does the L78L15ABZ require external components?
No, the L78L15ABZ does not require external components.
- What kind of protection does the L78L15ABZ have?
The L78L15ABZ has thermal overload protection and short-circuit protection.
- What is the operating temperature range of the L78L15ABZ?
The operating temperature range is from 0 to 125 °C.
- How does the L78L15ABZ improve upon Zener diode/resistor combinations?
The L78L15ABZ offers lower quiescent current and lower noise compared to Zener diode/resistor combinations.
- What is the quiescent current of the L78L15ABZ at 25 °C?
The quiescent current at 25 °C is typically 6 mA.
- What is the dropout voltage of the L78L15ABZ?
The dropout voltage is 1.7 V.
- Can the L78L15ABZ be used in high-current applications?
Yes, it can be used with power pass elements to create high-current voltage regulators.
- What are the typical applications of the L78L15ABZ?
Typical applications include local or on-card regulation, industrial and commercial power supply systems, and as replacements for Zener diode/resistor combinations.
