Overview
The KF33BD-TR is a very low dropout voltage regulator produced by STMicroelectronics. It is part of the KFxx series, which is 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 device is available in SO-8 and DPAK packages and offers a fixed output voltage of 3.3V. It 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.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 50 mA, VI = 5.3 V | 3.234 | 3.3 | 3.366 | V |
| Operating Input Voltage (VI) | IO = 500 mA | 20 | V | ||
| Output Current Limit (IO) | 1 | A | |||
| Quiescent Current (Id) | VI = 4.3 to 20V, IO = 0mA (ON MODE) | 0.5 | 1 | mA | |
| Quiescent Current (Id) | VI = 4.6 to 20V, IO = 500mA (OFF MODE) | 50 | 100 | µA | |
| Dropout Voltage (Vd) | IO = 500 mA | 0.4 | 0.7 | V | |
| Supply Voltage Rejection (SVR) | IO = 5 mA, VI = 5.3 ± 1 V, f = 120 Hz | 80 | dB | ||
| Operating Junction Temperature (TOP) | -40 | 125 | °C |
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 function.
- 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: 70 dB (typ.) at 120 Hz.
- Compact Packaging: Available in SO-8 and DPAK packages.
- Wide Temperature Range: Operating junction temperature range from -40°C to 125°C.
Applications
- Battery-Powered Systems: Ideal for low power consumption and long battery life.
- Low Noise Applications: Suitable for applications requiring minimal noise, such as audio and medical devices.
- Portable Electronics: Used in handheld devices, smartphones, and other portable electronics.
- Industrial Automation: Can be used in various industrial automation systems requiring stable and efficient voltage regulation.
- Automotive Systems: Suitable for automotive applications due to its wide operating temperature range and robust design.
Q & A
- What is the output voltage of the KF33BD-TR?
The output voltage of the KF33BD-TR is 3.3V.
- What is the maximum output current of the KF33BD-TR?
The maximum output current is up to 500 mA.
- What is the dropout voltage of the KF33BD-TR?
The dropout voltage is 0.4V at 500 mA output current.
- What is the quiescent current in ON and OFF modes?
In ON mode, the quiescent current is typically 500 µA, and in OFF mode, it is typically 50 µA.
- Does the KF33BD-TR have built-in protection features?
Yes, it has internal current and thermal limits for protection against overcurrent and overheating.
- What is the operating junction temperature range of the KF33BD-TR?
The operating junction temperature range is from -40°C to 125°C.
- What packages are available for the KF33BD-TR?
The device is available in SO-8 and DPAK packages.
- What is the supply voltage rejection of the KF33BD-TR?
The supply voltage rejection is typically 80 dB at 120 Hz.
- Is the KF33BD-TR suitable for battery-powered systems?
Yes, it is particularly suitable for battery-powered systems due to its low dropout voltage and low quiescent current.
- What is the output noise voltage of the KF33BD-TR?
The output noise voltage is 50 µV in the 10 Hz to 100 kHz bandwidth.
