Overview
The LF90CV from STMicroelectronics is a very low-dropout voltage regulator designed for low-noise, low-power applications, particularly in battery-powered systems. This regulator is part of the LFXX series, known for its high performance and reliability. It is available in various packages, including TO-220FP, DPAK, and PPAK, and offers a range of output voltages. The LF90CV is also qualified for automotive use, adhering to the AEC-Q100 specification, making it suitable for a wide range of applications requiring high reliability and stability.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 8.9 | 9 | 9.1 | V |
| Operating Input Voltage (VI) | 10 | - | 16 | V |
| Output Current Limit | - | - | 1 A | A |
| Line Regulation (∆VO) | 5 | - | 25 mV | mV |
| Load Regulation (∆VO) | 5 | - | 25 mV | mV |
| Quiescent Current (Id) - ON mode | 0.5 | 1 | 2 mA | mA |
| Quiescent Current (Id) - OFF mode | 50 | - | 100 µA | µA |
| Supply Voltage Rejection (SVR) | 76 dB @ 120 Hz | 71 dB @ 1 kHz | 60 dB @ 10 kHz | dB |
| Output Noise Voltage (eN) | - | - | 50 µV (10 Hz to 100 kHz) | µV |
| Dropout Voltage (Vd) | 0.2 | - | 0.7 V @ 500 mA | V |
| Control Input Logic Low (VIL) | 0.8 | - | - V | V |
| Control Input Logic High (VIH) | - | - | 2 V | V |
| Output Bypass Capacitance (CO) | 2 | - | 10 µF | µF |
Key Features
- Very Low Dropout Voltage: The LF90CV features a very low dropout voltage of 0.2 to 0.7 V, making it ideal for applications where minimal voltage loss is crucial.
- Low Quiescent Current: It has a low quiescent current of 0.5 to 2 mA in ON mode and 50 to 100 µA in OFF mode, which is beneficial for power-saving designs.
- High Output Current: The regulator can supply up to 500 mA of output current, making it suitable for a variety of load conditions.
- High Stability and Low Noise: The device requires only a 2.2 µF output capacitor for stability and exhibits low output noise voltage, ensuring reliable operation in noisy environments.
- Automotive Grade: Qualified according to the AEC-Q100 specification, it is suitable for automotive applications with an operating temperature range of -40 °C to 125 °C.
- Shutdown Logic Control: In the 5-pin configuration, it includes a shutdown logic control function, allowing parts of the board to be put in standby mode to reduce total power consumption.
Applications
- Battery-Powered Systems: Ideal for battery-powered devices due to its low dropout voltage and quiescent current.
- Automotive Systems: Suitable for automotive applications requiring high reliability and stability over a wide temperature range.
- Low-Power Electronics: Used in low-power electronic devices where minimizing power consumption is critical.
- Industrial Control Systems: Applicable in industrial control systems that require stable and low-noise voltage regulation.
- Consumer Electronics: Can be used in various consumer electronic devices that need efficient and reliable voltage regulation.
Q & A
- What is the typical output voltage of the LF90CV?
The typical output voltage of the LF90CV is 9 V.
- What is the maximum output current of the LF90CV?
The maximum output current of the LF90CV is 500 mA.
- What is the dropout voltage of the LF90CV at 500 mA output current?
The dropout voltage of the LF90CV at 500 mA output current is 0.2 to 0.7 V.
- What is the quiescent current in ON mode for the LF90CV?
The quiescent current in ON mode for the LF90CV is 0.5 to 2 mA.
- What is the operating temperature range for the LF90CV?
The operating temperature range for the LF90CV is -40 °C to 125 °C.
- Does the LF90CV have a shutdown logic control function?
- What is the recommended output bypass capacitance for the LF90CV?
The recommended output bypass capacitance for the LF90CV is 2 to 10 µF.
- Is the LF90CV suitable for automotive applications?
- What are the typical noise levels of the LF90CV?
The output noise voltage of the LF90CV is typically 50 µV over the frequency range of 10 Hz to 100 kHz.
- What packages are available for the LF90CV?
The LF90CV is available in TO-220FP, DPAK, and PPAK packages.
