Overview
The L78L15ACUTR 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 as fixed voltage regulators in various 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 | Value | Unit |
|---|---|---|
| Output Current | Up to 100 mA | mA |
| Output Voltage | 15 V (± 4% or ± 8% selection) | V |
| Input Voltage Range | 17.5 to 30 V | V |
| Line Regulation | 300 mV (VI = 17.5 to 30 V, TJ = 25 °C) | mV |
| Load Regulation | 150 mV (IO = 1 to 100 mA, TJ = 25 °C) | mV |
| Quiescent Current | 6.5 mA (TJ = 25 °C), 6 mA (TJ = 125 °C) | mA |
| Output Noise Voltage | 90 µV (B = 10 Hz to 100 kHz, TJ = 25 °C) | µV |
| Supply Voltage Rejection | 33 to 39 dB (VI = 18.5 to 28.5 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C) | dB |
| Dropout Voltage | 1.7 V | V |
| Operating Junction Temperature Range | 0 to 125 °C | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Output current up to 100 mA
- Output voltage of 15 V with ± 4% or ± 8% selection
- Internal current limiting and thermal shutdown for robust operation
- Short-circuit protection
- No external components required
- Low quiescent current and noise
- Available in SOT-89 package
Applications
The L78L15ACUTR is suitable for a wide range of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems
- Replacement for Zener diode/resistor combinations with lower quiescent current and noise
- Use with power pass elements to create high-current voltage regulators
- Industrial applications requiring reliable and robust voltage regulation
Q & A
- What is the maximum output current of the L78L15ACUTR?
The maximum output current is up to 100 mA.
- What are the available output voltages for the L78L series?
The L78L series offers output voltages of 3.3, 5, 6, 8, 9, 10, 12, 15, 18, and 24 V.
- Does the L78L15ACUTR require external components for operation?
No, the L78L15ACUTR does not require any external components for operation.
- What is the operating junction temperature range for the L78L15ACUTR?
The operating junction temperature range is 0 to 125 °C.
- What type of protection does the L78L15ACUTR have?
The L78L15ACUTR has internal current limiting, thermal shutdown, and short-circuit protection.
- What is the quiescent current of the L78L15ACUTR at 25 °C?
The quiescent current at 25 °C is 6.5 mA.
- What is the dropout voltage of the L78L15ACUTR?
The dropout voltage is 1.7 V.
- What is the supply voltage rejection of the L78L15ACUTR?
The supply voltage rejection is 33 to 39 dB (VI = 18.5 to 28.5 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C).
- In what package is the L78L15ACUTR available?
The L78L15ACUTR is available in the SOT-89 package.
- Can the L78L15ACUTR be used in industrial applications?
