Overview
The L4940D2T5-TR is a three-terminal positive voltage regulator from STMicroelectronics, designed to provide a stable and efficient voltage supply in various applications. This regulator is part of the L4940 series, which is available in TO-220 and D²PAK packages, offering fixed output voltages. The L4940D2T5-TR specifically provides a fixed output voltage of 5V with a maximum current of 1.5A. It is particularly suited for battery-powered equipment due to its very low dropout voltage, which helps in reducing power consumption and prolonging battery life.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 5 | V |
| Maximum Output Current | 1.5 | A |
| Maximum Input Voltage | 17 | V |
| Dropout Voltage (typ. at 1 A) | 450 | mV |
| Quiescent Current (typ. at 5 mA) | 8 | mA |
| Line Regulation (VI = 6 to 17 V, IO = 5 mA) | 4 to 10 | mV |
| Load Regulation (IO = 5 mA to 1.5 A) | 8 to 25 | mV |
| Thermal Shutdown | Yes | |
| Short-Circuit Protection | Yes | |
| Reverse Polarity Protection | Yes | |
| Operating Junction Temperature Range | -40 to +150 | °C |
| Package Type | D²PAK |
Key Features
- Precise 5V output voltage with low dropout voltage (typ. 450 mV at 1 A)
- Very low quiescent current to minimize power consumption
- Internal current limiting, anti-saturation circuit, thermal shutdown, and safe area protection
- Short-circuit and reverse polarity protection for enhanced reliability
- High supply voltage rejection (58 to 68 dB at 120 Hz)
- Available in D²PAK package for surface mount applications
Applications
The L4940D2T5-TR is suitable for a wide range of industrial and consumer applications, including:
- Battery-powered equipment to reduce consumption and prolong battery life
- Distributed power supplies with high total system efficiency
- Secondary regulation for switch-mode power supplies
- On-card regulation with short-circuit and thermal protection
Q & A
- What is the output voltage of the L4940D2T5-TR?
The output voltage of the L4940D2T5-TR is 5V. - What is the maximum output current of the L4940D2T5-TR?
The maximum output current is 1.5A. - What is the maximum input voltage for the L4940D2T5-TR?
The maximum input voltage is 17V. - What is the typical dropout voltage at 1 A for the L4940D2T5-TR?
The typical dropout voltage at 1 A is 450 mV. - Does the L4940D2T5-TR have thermal shutdown protection?
Yes, it does have thermal shutdown protection. - What type of package is the L4940D2T5-TR available in?
The L4940D2T5-TR is available in a D²PAK package. - What is the operating junction temperature range for the L4940D2T5-TR?
The operating junction temperature range is -40 to +150 °C. - Does the L4940D2T5-TR have short-circuit protection?
Yes, it has short-circuit protection. - What is the quiescent current of the L4940D2T5-TR at 5 mA output current?
The quiescent current at 5 mA output current is typically 8 mA. - What are some common applications for the L4940D2T5-TR?
Common applications include battery-powered equipment, distributed power supplies, and secondary regulation for switch-mode power supplies.
