Overview
The LF18CDT-TR is a very low-dropout voltage regulator produced by STMicroelectronics. This component is part of the LFXX series, known for its low-dropout voltage and low quiescent current, making it highly suitable for low-noise, low-power applications, particularly in battery-powered systems. The LF18CDT-TR is available in DPAK and PPAK packages and is qualified according to the AEC-Q100 specification for the automotive market, ensuring reliability over a wide temperature range of -40°C to 125°C.
Key Specifications
| Parameter | Min. | Max. | Unit | |
|---|---|---|---|---|
| Output Voltage (VO) | 1.764 | 1.8 | 1.836 | V |
| Operating Input Voltage (VI) | 3 | - | 16 | V |
| Output Current (IO) | - | - | 500 mA | - |
| Quiescent Current (Id) - ON mode | 0.5 | - | 2 mA | - |
| Quiescent Current (Id) - OFF mode | 50 | - | 100 µA | - |
| Dropout Voltage (Vd) | 0.2 | - | 0.7 V | - |
| Supply Voltage Rejection (SVR) | - | - | 80 dB (typ.) | - |
| Output Noise Voltage (eN) | - | - | 50 µV | - |
| Temperature Range | -40 | - | 125 °C | - |
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.
- High Output Current: Up to 500 mA.
- Logic-Controlled Electronic Shutdown: Available in 5-pin configuration (PPAK) with TTL-compatible logic control.
- Multiple Output Voltages: Available in various output voltages such as 1.5 V, 1.8 V, 2.5 V, 3.3 V, 4.7 V, 5 V, 6 V, 8 V, 8.5 V, 9 V, and 12 V.
- Automotive Grade: Qualified according to AEC-Q100 specification for automotive applications.
- Internal Current and Thermal Limit: Built-in protection against overcurrent and overheating.
- Low Capacitance Requirement: Only 2.2 µF capacitor required for stability.
- Precision Output Voltage: Available in ±1%, ±1.5%, or ±2% selection at 25°C.
Applications
- Battery-Powered Systems: Ideal for devices that require low power consumption and minimal noise.
- Automotive Electronics: Qualified for use in automotive applications due to its compliance with AEC-Q100 standards.
- Portable Electronics: Suitable for handheld devices, smartphones, and other portable electronic devices.
- Industrial Control Systems: Can be used in various industrial control systems where low noise and high reliability are crucial.
- Medical Devices: Applicable in medical devices that require stable and low-noise power supply.
Q & A
- What is the typical dropout voltage of the LF18CDT-TR?
The typical dropout voltage is 0.45 V.
- What is the maximum output current of the LF18CDT-TR?
The maximum output current is up to 500 mA.
- What are the available output voltages for the LF18CDT-TR?
The available output voltages include 1.5 V, 1.8 V, 2.5 V, 3.3 V, 4.7 V, 5 V, 6 V, 8 V, 8.5 V, 9 V, and 12 V.
- Is the LF18CDT-TR suitable for automotive applications?
Yes, it is qualified according to the AEC-Q100 specification for automotive applications.
- What is the temperature range of the LF18CDT-TR?
The temperature range is from -40°C to 125°C.
- What is the quiescent current in ON and OFF modes?
The quiescent current is typically 500 µA in ON mode and 50 µA in OFF mode.
- Does the LF18CDT-TR have built-in protection features?
Yes, it has internal current and thermal limits for protection.
- How much capacitance is required for stability?
Only 2.2 µF capacitor is required for stability.
- What is the supply voltage rejection of the LF18CDT-TR?
The supply voltage rejection is typically 80 dB.
- Is the LF18CDT-TR available in different precision levels?
Yes, it is available in ±1%, ±1.5%, or ±2% selection at 25°C.
