Overview
The LF33CDT-TR is a very low drop linear voltage regulator produced by STMicroelectronics. This regulator is part of the LFXX series and is known for its high accuracy and low power consumption, making it suitable for a wide range of applications, particularly in low-noise and battery-powered systems. Available in various packages such as TO-252-3 (DPAK), it offers a fixed output voltage of 3.3V and can supply up to 500 mA of current. The device features a very low dropout voltage and quiescent current, which are critical for efficient power management in modern electronic systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage - Max | 16 | V |
| Output Voltage Fixed | 3.3 | V |
| Dropout Voltage - Max | 1.3 | V |
| Output Current - Max | 500 | mA |
| Tolerance | ±2% | |
| Operating Temperature Range | -40°C to +125°C | |
| Regulator Topology | Fixed | |
| Quiescent Current | 100 µA | |
| No. of Outputs | Single | |
| Output Noise | 50 µV | |
| Load Regulation | 16 mV | |
| Line Regulation | 16 mV | |
| Package Style | TO-252-3 (DPAK) | |
| Mounting Method | Surface Mount |
Key Features
- Very low dropout voltage (0.45 V): Ensures efficient voltage regulation even at low input voltages.
- Very low quiescent current (typ. 50 µA in OFF mode, 500 µA in ON mode): Minimizes power consumption in both active and standby states.
- Output current up to 500 mA: Supports a wide range of load requirements.
- Logic-controlled electronic shutdown: Allows for TTL-compatible shutdown control, enabling partial board standby to reduce overall power consumption.
- Internal current and thermal limit: Provides built-in protection against overcurrent and overheating.
- Only 2.2 µF for stability: Reduces the need for large capacitors, saving board space and cost.
- Available in ±1% (AB) or ±2% (C) selection at 25 °C: Offers high accuracy options for different applications.
- Supply voltage rejection: 80 dB (typ.): Ensures good noise rejection and stability.
- Temperature range: -40 to 125 °C: Suitable for use in a wide range of environmental conditions.
Applications
The LF33CDT-TR is particularly suited for low-noise, low-power applications and is especially beneficial in battery-powered systems. Its features make it ideal for use in:
- Battery-powered devices
- Portable electronics
- Automotive systems (in automotive grade configurations)
- Industrial control systems
- Consumer electronics requiring stable and efficient power supply
Q & A
- What is the maximum input voltage for the LF33CDT-TR?
The maximum input voltage is 16 V.
- What is the fixed output voltage of the LF33CDT-TR?
The fixed output voltage is 3.3 V.
- What is the maximum dropout voltage for the LF33CDT-TR?
The maximum dropout voltage is 1.3 V.
- What is the maximum output current of the LF33CDT-TR?
The maximum output current is 500 mA.
- What is the operating temperature range of the LF33CDT-TR?
The operating temperature range is -40°C to +125°C.
- What is the quiescent current of the LF33CDT-TR in OFF mode?
The quiescent current in OFF mode is typically 50 µA.
- Does the LF33CDT-TR have a shutdown control feature?
- What is the minimum capacitor value required for stability?
The minimum capacitor value required for stability is 2.2 µF.
- Is the LF33CDT-TR available in automotive grade?
- What is the package style of the LF33CDT-TR?
The package style is TO-252-3 (DPAK).
