Overview
The KF50BD-TR is a very low drop voltage regulator produced by STMicroelectronics. It is part of the KF series, known for its very low dropout voltage and low quiescent current, making it suitable for low noise, low power applications, especially in battery-powered systems. This regulator is available in SO-8 and DPAK packages and offers a range of output voltages, including 5 V for the KF50BD-TR model.
The device features a logic-controlled electronic shutdown, internal current and thermal limits, and requires only a small 2.2 µF capacitor for stability, which helps in saving space and cost. The KF50BD-TR operates over a wide temperature range from -40 to 125 °C and has a high supply voltage rejection, making it reliable in various environmental conditions.
Key Specifications
| Parameter | Min. | Max. | Unit | |
|---|---|---|---|---|
| Output Voltage (VO) | 4.9 | 5 | 5.1 | V |
| Operating Input Voltage (VI) | - | - | 20 | V |
| Output Current (IO) | - | - | 500 mA | mA |
| Dropout Voltage (Vd) | 0.2 | 0.4 | 0.7 | V |
| Quiescent Current (Id) - ON Mode | 0.5 | 1 | - | mA |
| Quiescent Current (Id) - OFF Mode | 50 | 100 | - | µA |
| Supply Voltage Rejection (SVR) | 76 | - | - | dB |
| Operating Junction Temperature Range | -40 | - | 125 | °C |
| Thermal Resistance Junction-Ambient (RthJA) | - | - | 100 | °C/W |
Key Features
- Very Low Dropout Voltage: 0.4 V at 500 mA output current.
- 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: TTL compatible shutdown logic control.
- Internal Current and Thermal Limits: Built-in protection against overcurrent and overheating.
- Low Output Noise: 50 µV output noise voltage in the 10 Hz to 100 kHz bandwidth.
- High Supply Voltage Rejection: Up to 76 dB at 120 Hz.
- Compact Packaging: Available in SO-8 and DPAK packages.
- Wide Operating Temperature Range: From -40 to 125 °C.
Applications
- Battery-Powered Systems: Ideal for low power consumption and long battery life.
- Portable Electronics: Suitable for handheld devices, smartphones, and tablets.
- Industrial Automation: Used in control systems, sensors, and other low-power industrial applications.
- Automotive Systems: Applicable in automotive electronics where low dropout voltage and high reliability are crucial.
- Medical Devices: Suitable for medical equipment requiring low noise and high stability.
Q & A
- What is the typical dropout voltage of the KF50BD-TR?
The typical dropout voltage is 0.4 V at 500 mA output current.
- What is the maximum output current of the KF50BD-TR?
The maximum output current is up to 500 mA.
- What is the quiescent current in OFF mode?
The quiescent current in OFF mode is typically 50 µA.
- Does the KF50BD-TR have built-in protection features?
Yes, it has internal current and thermal limits for protection against overcurrent and overheating.
- What is the operating temperature range of the KF50BD-TR?
The operating temperature range is from -40 to 125 °C.
- What type of packages is the KF50BD-TR available in?
The KF50BD-TR is available in SO-8 and DPAK packages.
- What is the supply voltage rejection of the KF50BD-TR?
The supply voltage rejection is up to 76 dB at 120 Hz.
- How much output bypass capacitance is required for stability?
Only a 2.2 µF capacitor is required for stability.
- Is the KF50BD-TR suitable for battery-powered systems?
Yes, it is particularly suitable for low noise, low power applications and especially in battery-powered systems.
- What is the logic control input voltage range for shutdown?
The logic control input voltage range for shutdown is 0.8 V for logic low and 2 V for logic high.
