Overview
The LF120CDT-TR, produced by STMicroelectronics, is a very low-dropout voltage regulator designed for low-noise and low-power applications. This regulator is particularly suitable for battery-powered systems and other applications where power efficiency is crucial. It is available in various packages, including TO-220FP, DPAK, and PPAK, and offers a range of output voltages. The device features a very low dropout voltage of 0.45 V and a low quiescent current, making it ideal for systems that require minimal power consumption.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 11.7 | 12 | 12.3 | V |
| Operating Input Voltage (VI) | 14.5 | - | 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: 0.45 V, making it suitable for low-noise and low-power applications.
- Low Quiescent Current: Typical 50 µA in OFF mode and 500 µA in ON mode, reducing overall power consumption.
- High Output Current: Up to 500 mA, supporting a wide range of applications.
- Shutdown Logic Control: Available in the 5-pin configuration, allowing for part of the board to be put in standby mode to decrease total power consumption.
- Automotive Grade: Qualified according to AEC-Q100 specifications, suitable for automotive applications with a temperature range of -40 °C to 125 °C.
- Low Output Noise Voltage: 50 µV (10 Hz to 100 kHz), ensuring stable and quiet operation.
- High Supply Voltage Rejection: Up to 76 dB at 120 Hz, providing good noise rejection.
Applications
- Battery-Powered Systems: Ideal for devices that require low power consumption and high efficiency.
- Automotive Systems: Qualified for automotive use, making it suitable for various automotive applications.
- Low-Noise Systems: Suitable for applications requiring minimal noise, such as audio equipment and medical devices.
- Portable Electronics: Used in portable electronics where power efficiency and low dropout voltage are critical.
Q & A
- What is the typical dropout voltage of the LF120CDT-TR?
The typical dropout voltage is 0.45 V.
- What is the maximum output current of the LF120CDT-TR?
The maximum output current is up to 500 mA.
- What is the quiescent current in ON mode?
The quiescent current in ON mode is typically 0.5 to 1 mA.
- Does the LF120CDT-TR have a shutdown logic control feature?
- What is the operating temperature range for the automotive grade version?
The operating temperature range is -40 °C to 125 °C.
- What is the output noise voltage of the LF120CDT-TR?
The output noise voltage is 50 µV (10 Hz to 100 kHz).
- What is the supply voltage rejection of the LF120CDT-TR?
The supply voltage rejection is up to 76 dB at 120 Hz.
- What is the recommended output bypass capacitance?
The recommended output bypass capacitance is 2 to 10 µF.
- What are the typical logic levels for the control input?
The typical logic levels are 0.8 V for logic low and 2 V for logic high.
- In which packages is the LF120CDT-TR available?
The LF120CDT-TR is available in TO-220FP, DPAK, and PPAK packages.
