Overview
The L7905C-D2TR is a negative voltage regulator from STMicroelectronics, part of the L79 series. This three-terminal regulator is designed to provide a stable negative output voltage and is available in various packages, including TO-220, TO-220FP, and D²PAK. The L7905C-D2TR specifically offers a fixed output voltage of -5V. Although the L7905C-D2TR is currently obsolete and no longer manufactured, it remains relevant for understanding the capabilities and applications of the L79 series.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | -4.8 | -5 | -5.2 | V |
| Output Current (IO) | - | - | 1.5 A | A |
| Dropout Voltage (Vd) | - | - | 1.4 V | V |
| Short Circuit Current (Isc) | - | - | 1.8 A | A |
| Quiescent Current (Id) | - | 3 mA | - | mA |
| Thermal Resistance Junction-Case (RthJC) | - | 3 °C/W (D²PAK) | - | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | - | 62.5 °C/W (D²PAK) | - | °C/W |
| Operating Junction Temperature (TJ) | 0 | - | 150 °C | °C |
| Storage Temperature Range (TSTG) | -65 | - | 150 °C | °C |
Key Features
- Fixed negative output voltage of -5V
- Output current up to 1.5 A
- Thermal overload protection
- Short-circuit protection
- Output SOA (Safe Operating Area) protection
- Output voltage tolerance of 4% at 25 °C (C version)
- Able to provide local on-card regulation, eliminating distribution problems associated with single point regulation
- Can be used with external components to obtain adjustable voltages and currents
- Available in TO-220, TO-220FP, and D²PAK packages
Applications
- Local on-card regulation in various electronic systems
- Suitable for split power supplies, particularly in applications requiring both positive and negative voltages
- High current negative voltage regulation in power supplies, audio equipment, and other electronic devices
- Adjustable voltage and current regulation with external components
- Use in circuits requiring stable negative voltage outputs, such as in industrial control systems, medical devices, and telecommunications equipment
Q & A
- What is the output voltage of the L7905C-D2TR?
The output voltage of the L7905C-D2TR is -5V.
- What is the maximum output current of the L7905C-D2TR?
The maximum output current is up to 1.5 A.
- What types of protection does the L7905C-D2TR offer?
The L7905C-D2TR offers thermal overload protection, short-circuit protection, and output SOA protection.
- In what packages is the L7905C-D2TR available?
The L7905C-D2TR is available in TO-220, TO-220FP, and D²PAK packages.
- What is the typical quiescent current of the L7905C-D2TR?
The typical quiescent current is 3 mA.
- What is the dropout voltage of the L7905C-D2TR?
The dropout voltage is 1.4 V.
- Can the L7905C-D2TR be used for adjustable voltage regulation?
Yes, it can be used with external components to obtain adjustable voltages and currents.
- What is the operating junction temperature range for the L7905C-D2TR?
The operating junction temperature range is from 0 to 150 °C.
- Is the L7905C-D2TR suitable for high current applications?
Yes, it is suitable for high current applications up to 1.5 A.
- Why is the L7905C-D2TR useful in split power supplies?
It is useful in split power supplies because it provides the same voltage options as the L78 positive standard series, making it ideal for applications requiring both positive and negative voltages.
