Overview
The LF50CPT-TR is a very low drop voltage regulator produced by STMicroelectronics. This regulator is designed to provide high performance and efficiency in various electronic systems. It features a very low dropout voltage of 0.4 to 0.7 V at 500 mA output current, making it suitable for low-noise, low-power applications, particularly in battery-powered systems. The device is available in several packages, including TO-220FP, DPAK, and PPAK, and is qualified according to the AEC-Q100 specification for automotive applications, operating in a temperature range of -40 °C to 125 °C.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (V) | 4.95 | 5 | 5.05 | V |
| Operating Input Voltage (V) | 6 | - | 16 | V |
| Output Current Limit (A) | - | - | 1 | A |
| Dropout Voltage (V) at 200 mA | 0.2 | - | 0.35 | V |
| Dropout Voltage (V) at 500 mA | 0.4 | - | 0.7 | V |
| Quiescent Current (mA) in ON mode | 0.5 | 1 | 2 | mA |
| Quiescent Current (µA) in OFF mode | 50 | - | 100 | µA |
| Supply Voltage Rejection (dB) at 120 Hz | 76 | - | - | dB |
| Output Noise Voltage (µV) from 10 Hz to 100 kHz | - | - | 50 | µV |
| Control Input Logic Low (V) | 0.8 | - | - | V |
| Control Input Logic High (V) | - | - | 2 | V |
| Output Bypass Capacitance (µF) | 2 | - | 10 | µF |
Key Features
- Very low dropout voltage (0.4 to 0.7 V at 500 mA output current)
- Low quiescent current (typ. 50 µA in OFF mode, 500 µA in ON mode)
- Output current up to 500 mA
- Logic-controlled electronic shutdown
- High supply voltage rejection (up to 76 dB at 120 Hz)
- Low output noise voltage (50 µV from 10 Hz to 100 kHz)
- Available in TO-220FP, DPAK, and PPAK packages
- AEC-Q100 qualified for automotive applications
- Operating temperature range: -40 °C to 125 °C
Applications
The LF50CPT-TR is particularly suited for low-noise, low-power applications and is especially useful in battery-powered systems. It is also ideal for automotive applications due to its AEC-Q100 qualification. Other potential applications include:
- Portable electronics
- Industrial control systems
- Automotive systems (e.g., infotainment, safety systems)
- Medical devices
- Consumer electronics requiring low power consumption
Q & A
- What is the typical dropout voltage of the LF50CPT-TR at 500 mA output current?
The typical dropout voltage is 0.4 to 0.7 V at 500 mA output current. - What is the quiescent current in ON and OFF modes?
The quiescent current is typically 1 mA in ON mode and 50 µA in OFF mode. - What is the maximum output current of the LF50CPT-TR?
The maximum output current is 500 mA. - What is the operating temperature range of the LF50CPT-TR?
The operating temperature range is -40 °C to 125 °C. - Is the LF50CPT-TR qualified for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications. - What packages is the LF50CPT-TR available in?
The device is available in TO-220FP, DPAK, and PPAK packages. - What is the supply voltage rejection of the LF50CPT-TR at 120 Hz?
The supply voltage rejection is up to 76 dB at 120 Hz. - What is the output noise voltage of the LF50CPT-TR?
The output noise voltage is 50 µV from 10 Hz to 100 kHz. - What is the control input logic level for the LF50CPT-TR?
The control input logic low is 0.8 V and logic high is 2 V. - What is the recommended output bypass capacitance for the LF50CPT-TR?
The recommended output bypass capacitance is 2 to 10 µF.
