Overview
The L7918CV is a three-terminal negative voltage regulator produced by STMicroelectronics. It is part of the L79 series, which offers fixed output voltages and is available in various packages including TO-220, TO-220FP, and D²PAK. This regulator is designed to provide local on-card regulation, eliminating the issues associated with single-point regulation. It is particularly suited for split power supplies and can deliver up to 1.5 A of output current with adequate heat sinking.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | -17.7 to -18.3 | V |
| Output Current | Up to 1.5 | A |
| Input Voltage | -21 to -33 | V |
| Quiescent Current | 3 | mA |
| Dropout Voltage | 1.1 | V |
| Line Regulation | 300 mV (max) | mV |
| Load Regulation | 300 mV (max) | mV |
| Thermal Resistance (Junction-Case) | 3 (D²PAK), 5 (TO-220, TO-220FP) | °C/W |
| Thermal Resistance (Junction-Ambient) | 62.5 (D²PAK), 50 (TO-220), 60 (TO-220FP) | °C/W |
| Operating Junction Temperature | 0 to 150 °C (L79xxC), 0 to 125 °C (L79xxAC) | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Fixed negative output voltage of -18V
- Output current up to 1.5 A
- Thermal overload protection
- Short-circuit protection
- Output SOA (Safe Operating Area) protection
- Low quiescent current of 3 mA
- Low dropout voltage of 1.1 V
- High line and load regulation
- Adequate heat sinking for high current delivery
Applications
The L7918CV is suitable for a wide range of applications, including:
- Local on-card regulation to eliminate distribution problems associated with single-point regulation
- Split power supplies, particularly where both positive and negative voltages are required
- Industrial and consumer electronics requiring stable negative voltage supplies
- Automotive systems needing robust voltage regulation
Q & A
- What is the output voltage of the L7918CV?
The output voltage of the L7918CV is -18V. - What is the maximum output current of the L7918CV?
The maximum output current is up to 1.5 A. - What are the available packages for the L7918CV?
The L7918CV is available in TO-220, TO-220FP, and D²PAK packages. - Does the L7918CV have thermal protection?
Yes, it has thermal overload protection. - What is the quiescent current of the L7918CV?
The quiescent current is 3 mA. - What is the dropout voltage of the L7918CV?
The dropout voltage is 1.1 V. - Can the L7918CV be used in split power supplies?
Yes, it is particularly suited for split power supplies. - What is the operating junction temperature range for the L7918CV?
The operating junction temperature range is 0 to 150 °C for L79xxC and 0 to 125 °C for L79xxAC. - Does the L7918CV have short-circuit protection?
Yes, it has short-circuit protection. - What is the storage temperature range for the L7918CV?
The storage temperature range is -65 to 150 °C.
