Overview
The L78S09CV-DG is a 2 A positive voltage regulator IC from STMicroelectronics, part of the L78S series. This three-terminal regulator is available in a TO-220 package and is designed to provide a fixed output voltage of 9 V. It is highly versatile and can be used in a wide range of applications, offering local on-card regulation and eliminating the distribution problems associated with single point regulation. The device is equipped with internal current limiting, thermal shut-down, and safe area protection, making it essentially indestructible if adequate heat sinking is provided.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 8.65 | 9 | 9.35 | V |
| Line Regulation (ΔVO) | 130 | mV (VI = 11 to 25 V) | ||
| Load Regulation (ΔVO) | 170 | mV (IO = 20 mA to 1.5 A) | ||
| Quiescent Current (IQ) | 8 | mA | ||
| Output Voltage Drift (ΔVO/ΔT) | -1 | mV/°C (IO = 5 mA, TJ = 0 °C to 70 °C) | ||
| Output Noise Voltage (eN) | 60 | µV (B = 10 Hz to 100 kHz) | ||
| Supply Voltage Rejection (SVR) | 47 | dB (f = 120 Hz) | ||
| Operating Input Voltage (VI) | 12 | V (IO ≤ 1 A) | ||
| Output Resistance (RO) | 17 | mΩ (f = 1 kHz) | ||
| Short Circuit Current (Isc) | 500 | mA (VI = 27 V) | ||
| Short Circuit Peak Current (Iscp) | 3 | A |
Key Features
- Output current up to 2 A
- Fixed output voltage of 9 V
- Thermal protection
- Short circuit protection
- Output transition SOA protection
- Internal current limiting and safe area protection
- Available in TO-220 package
- Can be used with external components to obtain adjustable voltages and currents
Applications
The L78S09CV-DG is suitable for a wide range of applications, including local on-card regulation in electronic devices, power supplies, and any system requiring a stable 9 V output voltage. It is particularly useful in scenarios where single point regulation is not feasible or efficient.
Q & A
- What is the output voltage of the L78S09CV-DG?
The output voltage of the L78S09CV-DG is 9 V. - What is the maximum output current of the L78S09CV-DG?
The maximum output current is up to 2 A. - What type of protection does the L78S09CV-DG have?
The device has thermal protection, short circuit protection, and output transition SOA protection. - In what package is the L78S09CV-DG available?
The L78S09CV-DG is available in a TO-220 package. - Can the L78S09CV-DG be used for adjustable voltages?
Yes, it can be used with external components to obtain adjustable voltages and currents. - What is the quiescent current of the L78S09CV-DG?
The quiescent current is typically 8 mA. - What is the operating input voltage range for the L78S09CV-DG?
The operating input voltage is typically 12 V for IO ≤ 1 A. - Does the L78S09CV-DG have internal current limiting?
Yes, it has internal current limiting and safe area protection. - What is the thermal resistance junction-ambient for the L78S09CV-DG?
The thermal resistance junction-ambient is 50 °C/W. - Is the L78S09CV-DG still in production?
No, the L78S09CV-DG is obsolete and no longer manufactured.
