Overview
The L7912CP is a three-terminal negative voltage regulator from STMicroelectronics, part of the L79 series. This regulator is available in various packages, including TO-220, TO-220FP, and D²PAK, making it versatile for a wide range of applications. It is designed to provide local on-card regulation, eliminating distribution problems associated with single-point regulation. The L7912CP 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 | -11.5 to -12.5 | V |
| Output Current | Up to 1.5 A | A |
| Input Voltage Range | -15.5 to -27 V | V |
| Quiescent Current | 3 mA | mA |
| Dropout Voltage | 1.1 V | V |
| Short Circuit Current | 1.0 A | A |
| Thermal Resistance Junction-Case | 3 °C/W (D²PAK), 5 °C/W (TO-220 and TO-220FP) | °C/W |
| Operating Junction Temperature Range | 0 to 150 °C (L79xxC), 0 to 125 °C (L79xxAC) | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Output current up to 1.5 A
- Thermal overload protection
- Short-circuit protection
- Output SOA (Safe Operating Area) protection
- Output voltage tolerance of 2% (AC version) or 4% (C version) at 25 °C
- Can be used with external components to obtain adjustable voltages and currents
- Available in TO-220, TO-220FP, and D²PAK packages
Applications
The L7912CP is suitable for a variety 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
- Systems requiring high current and stable negative voltage regulation
- Industrial and consumer electronics where reliable voltage regulation is crucial
Q & A
- What is the output voltage of the L7912CP?
The output voltage of the L7912CP is -12 V, with a tolerance of -11.5 to -12.5 V. - What is the maximum output current of the L7912CP?
The maximum output current is up to 1.5 A. - What are the available packages for the L7912CP?
The L7912CP is available in TO-220, TO-220FP, and D²PAK packages. - What is the quiescent current of the L7912CP?
The quiescent current is 3 mA. - Does the L7912CP have thermal protection?
Yes, it has thermal overload protection. - Can the L7912CP be used for adjustable voltage regulation?
Yes, it can be used with external components to obtain adjustable voltages and currents. - What is the dropout voltage of the L7912CP?
The dropout voltage is 1.1 V. - What is the short-circuit current of the L7912CP?
The short-circuit current is 1.0 A. - What is the operating junction temperature range for the L7912CP?
The operating junction temperature range is 0 to 150 °C for the L79xxC version and 0 to 125 °C for the L79xxAC version. - What are some common applications of the L7912CP?
Common applications include local on-card regulation, split power supplies, and systems requiring high current and stable negative voltage regulation.
