AiT Semiconductor has introduced the A4788, a state-of-the-art power switch designed to handle heavy capacitive loads and short circuit conditions in USB applications. This robust device, integrated with an 80 mΩ (TYP) high-side P-Channel MOSFET, offers reliable protection and efficient power management for a variety of electronic devices.
Key features
- Current Limiting & Thermal Shutdown: The A4788 is equipped with an internal current limiting function and a thermal shutdown feature that activates when the die temperature exceeds 150°C. This protection mechanism ensures both the device and connected load are safeguarded against potential over-current damage.
- Soft-Start Functionality: To manage inrush current during power-up, especially in applications with highly capacitive loads, the A4788 includes a soft-start circuit. This feature helps minimize the voltage sag that can occur during hot-plug events.
- Fault Detection & Reporting: The device includes a FLAG pin that provides an active low, open-drain output. This pin signals over-current and thermal shutdown conditions, with a 13ms blanking time to prevent false reporting.
- Versatile Package Options: Available in a compact SOT-25 package, the A4788 offers different variants with current limit levels of 1.1 A, 2.1 A, and 2.6 A, catering to various application needs. Halogen-free packaging is also available, making it an environmentally friendly choice.
Key specifications
The A4788 operates with an input voltage range of 2.5 V to 5.5 V and features a low quiescent current, making it suitable for energy-sensitive applications. It also boasts a fast turn-on response and operates over a wide temperature range from -40°C to 85°C, ensuring reliable performance in various environmental conditions.
Key applications
The A4788 is ideal for a wide range of applications, including:
- Smartphones and LCD TVs: Ensuring reliable power management in modern consumer electronics.
- Set-Top Boxes and VOIP Devices: Providing stable operation in communication devices.
- USB Bus/Self Powered Hubs/Peripherals: Safeguarding USB-powered devices from over-current and thermal risks.
- Portable Consumer or Medical Products: Offering enhanced safety and efficiency in portable devices.
