Overview
The KF25BDT-TR is a very low drop voltage regulator produced by STMicroelectronics. It is part of the KFxx series, which is known for its very 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 both SO-8 and DPAK packages and offers a range of output voltages, including 2.5 V for the KF25BDT-TR model.
This regulator 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 device operates over a wide temperature range from -40 to 125 °C and has a high supply voltage rejection of 70 dB (typical).
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 50 mA, VI = 4.5 V | 2.45 | 2.5 | 2.55 | V |
| Operating Input Voltage (VI) | IO = 500 mA | 20 | V | ||
| Output Current Limit (IO) | 1 | A | |||
| Line Regulation (ΔVO) | VI = 3.5 to 20 V, IO = 5 mA | 2 | 12 | mV | |
| Load Regulation (ΔVO) | VI = 3.8 V, IO = 5 to 500 mA | 2 | 50 | mV | |
| Quiescent Current (Id) - ON Mode | VI = 3.5 to 20 V, IO = 0 mA | 0.5 | 1 | mA | |
| Quiescent Current (Id) - OFF Mode | VI = 6 V | 50 | 100 | µA | |
| Dropout Voltage (Vd) | IO = 500 mA | 0.4 | 0.7 | V | |
| Supply Voltage Rejection (SVR) | IO = 5 mA, VI = 4.5 ± 1 V, f = 120 Hz | 70 | dB | ||
| Operating Junction Temperature Range (TOP) | -40 | 125 | °C |
Key Features
- Very Low Dropout Voltage: 0.4 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: TTL compatible shutdown function to reduce power consumption.
- Internal Current and Thermal Limits: Ensures device protection.
- Low Capacitance Requirement: Only 2.2 µF capacitor needed for stability.
- High Accuracy: Available in ± 2 % accuracy at 25 °C.
- High Supply Voltage Rejection: 70 dB (typical).
- Wide Temperature Range: -40 to 125 °C.
Applications
- Battery-Powered Systems: Ideal for devices that require low power consumption and high efficiency.
- Low Noise Applications: Suitable for applications requiring minimal noise and high stability.
- Local Voltage Regulation: Can be used as a local regulator to power specific parts of a board, reducing overall power consumption.
- Portable Electronics: Used in portable devices such as smartphones, tablets, and other handheld electronics.
- Industrial Automation: Can be used in industrial control systems where low power and high reliability are crucial.
Q & A
- What is the typical dropout voltage of the KF25BDT-TR?
The typical dropout voltage is 0.4 V.
- What is the maximum output current of the KF25BDT-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.
- What is the operating junction temperature range of the KF25BDT-TR?
The operating junction temperature range is -40 to 125 °C.
- Does the KF25BDT-TR have a shutdown function?
Yes, it has a logic-controlled electronic shutdown function.
- What is the required capacitance for stability?
Only a 2.2 µF capacitor is required for stability.
- What is the supply voltage rejection of the KF25BDT-TR?
The supply voltage rejection is 70 dB (typical).
- In what packages is the KF25BDT-TR available?
The KF25BDT-TR is available in SO-8 and DPAK packages.
- What are the typical applications of the KF25BDT-TR?
Typical applications include battery-powered systems, low noise applications, and local voltage regulation in various electronic devices.
- What is the output voltage accuracy of the KF25BDT-TR at 25 °C?
The output voltage accuracy is ± 2 % at 25 °C.
