Overview
The L78L09ACD13TR 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 fixed voltage regulation in various applications, including local or on-card regulation to eliminate noise and distribution issues 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 | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25 °C | 8.28 | 9 | 9.72 | V |
| Output Voltage (VO) | IO = 1 to 40 mA, VI = 11.5 to 23 V | 8.1 | 9 | 9.9 | V |
| Line Regulation (∆VO) | VI = 11.5 to 23 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 | - | 6.5 mA | - | mA |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25 °C | - | - | 60 µV | µV |
| Supply Voltage Rejection (SVR) | VI = 9 to 20 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C | - | - | 36 to 45 dB | dB |
| Dropout Voltage (Vd) | - | - | - | 1.7 V | 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 for robust operation
- Low quiescent current and low noise
Applications
- Local or on-card voltage regulation to eliminate noise and distribution problems
- Replacement for Zener diode/resistor combinations
- Use with power pass elements to create high-current voltage regulators
- Industrial and commercial applications requiring stable and reliable voltage regulation
Q & A
- What is the maximum output current of the L78L09ACD13TR? The maximum output current is up to 100 mA.
- What are the available output voltages for the L78L series? The output voltages include 3.3, 5, 6, 8, 9, 10, 12, 15, 18, and 24 V.
- Does the L78L09ACD13TR require external components? No, it does not require any external components.
- What is the operating temperature range of the L78L09ACD13TR? The operating temperature range is from 0 to 125 °C.
- What kind of protection does the L78L09ACD13TR have? It has thermal overload protection and short-circuit protection.
- Can the L78L09ACD13TR be used as a replacement for Zener diode/resistor combinations? Yes, it can be used as a replacement, offering lower quiescent current and lower noise.
- What is the quiescent current of the L78L09ACD13TR at 25 °C? The quiescent current is 6.5 mA at 25 °C.
- What is the dropout voltage of the L78L09ACD13TR? The dropout voltage is 1.7 V.
- How does the L78L09ACD13TR handle noise and distribution issues? It is designed for local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
- Can the L78L09ACD13TR be used in high-current applications? Yes, it can be used with power pass elements to create high-current voltage regulators.
