Overview
The L78L09ACZ 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. This makes the regulator essentially indestructible. The L78L09ACZ is designed to replace Zener diode/resistor combinations, offering improvements such as lower quiescent current and lower noise.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VO) | 8.28 - 9.72 | V |
| Input Voltage (VI) | 11.5 to 23 V | V |
| Output Current (IO) | 100 mA | mA |
| Line Regulation | 200 - 250 mV | mV |
| Load Regulation | 40 - 80 mV | mV |
| Quiescent Current (Id) | 6 mA (TJ = 25°C), 5.5 mA (TJ = 125°C) | mA |
| Output Noise Voltage (eN) | 70 µV (B = 10 Hz to 100 kHz, TJ = 25°C) | µV |
| Supply Voltage Rejection (SVR) | 37 - 44 dB (VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25°C) | dB |
| Dropout Voltage (Vd) | 1.7 V | V |
| Operating Junction Temperature Range | 0 to 125 °C | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Internal current limiting and thermal shutdown, making the regulator essentially indestructible.
- Low quiescent current and low noise.
- Replacement for Zener diode/resistor combinations with improved performance.
- Fixed output voltage of 9V.
- High supply voltage rejection and low dropout voltage.
Applications
- General-purpose voltage regulation in electronic devices.
- Replacement for Zener diode/resistor combinations in various circuits.
- Use in power supplies, battery chargers, and other voltage-regulated systems.
- Embedded systems and IoT devices requiring stable voltage regulation.
Q & A
- What is the output voltage of the L78L09ACZ regulator?
The output voltage of the L78L09ACZ regulator is 9V, with a range of 8.28V to 9.72V.
- What is the maximum output current of the L78L09ACZ?
The maximum output current of the L78L09ACZ is 100 mA.
- What are the key features of the L78L09ACZ regulator?
The key features include internal current limiting, thermal shutdown, low quiescent current, and low noise.
- What is the operating junction temperature range for the L78L09ACZ?
The operating junction temperature range is 0 to 125 °C.
- What is the dropout voltage of the L78L09ACZ regulator?
The dropout voltage is 1.7 V.
- What are some common applications of the L78L09ACZ regulator?
Common applications include general-purpose voltage regulation, replacement for Zener diode/resistor combinations, power supplies, battery chargers, and embedded systems.
- What is the quiescent current of the L78L09ACZ at room temperature?
The quiescent current at room temperature (TJ = 25°C) is 6 mA.
- How does the L78L09ACZ handle thermal issues?
The L78L09ACZ features thermal shutdown to protect against overheating.
- What is the supply voltage rejection of the L78L09ACZ?
The supply voltage rejection is 37 - 44 dB (VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25°C).
- What is the storage temperature range for the L78L09ACZ?
The storage temperature range is -65 to 150 °C.
