Overview
The LF50CV-DG, produced by STMicroelectronics, is a very low-dropout voltage regulator designed for high-performance applications. This regulator is part of the LF50 series, known for its low quiescent current and high output current capability. It is suitable for a wide range of applications, including automotive, industrial, and consumer electronics, where stable and efficient voltage regulation is crucial.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 50 mA, VI = 7 V | 4.9 | 5 | 5.1 | V |
| Operating Input Voltage (VI) | IO = 500 mA | 2.5 | - | 16 | V |
| Output Current Limit (IO) | - | - | - | 1 A | A |
| Line Regulation (∆VO) | VI = 6 to 16 V, IO = 5 mA | 5 | - | 25 mV | mV |
| Load Regulation (∆VO) | VI = 6.3 V, IO = 5 to 500 mA | 5 | - | 25 mV | mV |
| Quiescent Current (Id) | VI = 6 to 16 V, IO = 0 mA, ON mode | 0.5 | 1 | 2 mA | mA |
| Quiescent Current (Id) | VI = 6 V, OFF mode | 50 | - | 100 µA | µA |
| Dropout Voltage (Vd) | IO = 200 mA | 0.2 | - | 0.35 V | V |
| Control Input Logic Low (VIL) | Ta = -40 to 125 °C | 0.8 | - | - | V |
| Control Input Logic High (VIH) | Ta = -40 to 125 °C | - | - | 2 V | V |
| Output Bypass Capacitance (CO) | ESR = 0.1 to 10 Ω, IO = 0 to 500 mA | 2 | - | 10 µF | µF |
Key Features
- Very Low Dropout Voltage: The LF50CV-DG features a very low dropout voltage, typically 0.2 to 0.35 V at 200 mA and 0.4 to 0.7 V at 500 mA, ensuring minimal voltage loss.
- Low Quiescent Current: It has a low quiescent current of 0.5 to 1 mA in ON mode and 50 to 100 µA in OFF mode, making it power-efficient.
- High Output Current Capability: The regulator can supply up to 500 mA of output current.
- Wide Operating Input Voltage Range: It operates over a wide input voltage range of 2.5 to 16 V.
- Good Line and Load Regulation: The device exhibits good line and load regulation, ensuring stable output voltage across various operating conditions.
- Low Output Noise Voltage: The output noise voltage is typically 50 µV over a bandwidth of 10 Hz to 100 kHz.
- High Supply Voltage Rejection Ratio (SVR): It has a high SVR, typically 76 dB at 120 Hz, ensuring good noise rejection.
Applications
- Automotive Systems: The LF50CV-DG is suitable for automotive applications due to its robust performance over a wide temperature range and compliance with automotive standards.
- Industrial Control Systems: It is used in industrial control systems where reliable and stable voltage regulation is essential.
- Consumer Electronics: The regulator is also used in various consumer electronics such as audio equipment, medical devices, and other portable electronics.
- Power Supplies and DC-DC Converters: It can be integrated into power supplies and DC-DC converters to provide stable output voltages.
Q & A
- What is the typical dropout voltage of the LF50CV-DG?
The typical dropout voltage is 0.2 to 0.35 V at 200 mA and 0.4 to 0.7 V at 500 mA.
- What is the maximum output current of the LF50CV-DG?
The maximum output current is 500 mA.
- What is the operating input voltage range of the LF50CV-DG?
The operating input voltage range is 2.5 to 16 V.
- What is the quiescent current in ON and OFF modes?
In ON mode, the quiescent current is typically 0.5 to 1 mA. In OFF mode, it is typically 50 to 100 µA.
- What is the line regulation of the LF50CV-DG?
The line regulation is typically 5 to 25 mV over the input voltage range of 6 to 16 V.
- What is the load regulation of the LF50CV-DG?
The load regulation is typically 5 to 25 mV over the output current range of 5 to 500 mA.
- What is the output noise voltage of the LF50CV-DG?
The output noise voltage is typically 50 µV over a bandwidth of 10 Hz to 100 kHz.
- What is the supply voltage rejection ratio (SVR) of the LF50CV-DG?
The SVR is typically 76 dB at 120 Hz.
- What are the typical control input logic levels for the LF50CV-DG?
The control input logic low is typically 0.8 V, and the control input logic high is typically 2 V.
- What is the recommended output bypass capacitance for the LF50CV-DG?
The recommended output bypass capacitance is 2 to 10 µF with an ESR of 0.1 to 10 Ω.
