Overview
The L78L15ACZ-TR is a three-terminal positive voltage regulator from STMicroelectronics. This component is part of the L78L series, which is known for its robustness and reliability. The L78L15ACZ-TR is designed to provide a fixed output voltage of 15V with a maximum output current of up to 100 mA. It features internal current limiting and thermal shutdown, making it essentially indestructible when adequate heat-sinking is provided. This regulator is suitable for a wide range of applications, including local or on-card regulation, noise elimination, and distribution problems associated with single-point regulation.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25 °C | 13.8 | 15 | 16.2 | V |
| Output Voltage (VO) | IO = 1 to 40 mA, VI = 17.5 to 30 V | 13.5 | 15 | 16.5 | V |
| Line Regulation (∆VO) | VI = 17.5 to 30 V, TJ = 25 °C | 300 | 250 | mV | |
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25 °C | 150 | mV | ||
| Quiescent Current (Id) | TJ = 25 °C | 6.5 | mA | ||
| Quiescent Current Change (∆Id) | IO = 1 to 40 mA | 0.2 | mA | ||
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25 °C | 90 | µV | ||
| Supply Voltage Rejection (SVR) | VI = 18.5 to 28.5 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C | 33 | 39 | dB | |
| Dropout Voltage (Vd) | 1.7 | V | |||
| Input Voltage (VI) | VO = 15 V | 35 | V | ||
| Output Current (IO) | 100 | mA | |||
| Operating Junction Temperature (TJ) | 0 | 125 | °C |
Key Features
- Output current up to 100 mA
- Fixed output voltage of 15V
- Internal current limiting and thermal shutdown for robustness
- No external components required
- Available in ± 4% (A) or ± 8% (C) selection
- Short-circuit protection
- Low quiescent current and noise
- Can be used as a Zener diode/resistor combination replacement
- Compatible with power pass elements for high-current voltage regulators
Applications
- Local or on-card regulation for noise elimination and distribution problems
- Replacement for Zener diode/resistor combinations
- Use with power pass elements to create high-current voltage regulators
- General-purpose voltage regulation in various electronic devices
- Embedded systems requiring stable voltage supply
Q & A
- What is the maximum output current of the L78L15ACZ-TR?
The maximum output current is up to 100 mA.
- What is the fixed output voltage of the L78L15ACZ-TR?
The fixed output voltage is 15V.
- Does the L78L15ACZ-TR require external components?
No, it does not require external components.
- What are the key protection features of the L78L15ACZ-TR?
It features internal current limiting, thermal shutdown, and short-circuit protection.
- What is the typical quiescent current of the L78L15ACZ-TR?
The typical quiescent current is 6.5 mA at TJ = 25 °C.
- What is the dropout voltage of the L78L15ACZ-TR?
The dropout voltage is 1.7 V.
- What are the operating temperature ranges for the L78L15ACZ-TR?
The operating junction temperature range is 0 to 125 °C.
- Can the L78L15ACZ-TR be used in high-current applications?
Yes, it can be used with power pass elements to create high-current voltage regulators.
- What are some common applications of the L78L15ACZ-TR?
Common applications include local or on-card regulation, Zener diode/resistor combination replacement, and general-purpose voltage regulation.
- What is the supply voltage rejection of the L78L15ACZ-TR?
The supply voltage rejection is between 33 to 39 dB at VI = 18.5 to 28.5 V, f = 120 Hz, and IO = 40 mA at TJ = 25 °C.
