TPS54331D

The TPS54331 is a 28V, 3A non-synchronous step-down converter with an integrated high-side MOSFET featuring low RDS(on). To improve efficiency under light-load conditions, a pulse-skip Eco-mode feature is automatically activated. In addition, the 1μA shutdown supply current makes this device suitable for battery-powered applications. Current-mode control with internal slope compensation simplifies external compensation calculations while reducing component count and allowing the use of ceramic output capacitors. A resistive voltage divider programs the hysteresis of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoot during startup and transient conditions. Cycle-by-cycle current limiting, frequency foldback, and thermal shutdown protect the device and load under overload conditions. The TPS54331 is available in an 8-pin SOIC package and an 8-pin SOPowerPAD package, both internally optimized for improved thermal performance.

Applications

• Consumer applications such as set-top boxes, CPE devices, LCD displays, peripherals, and battery chargers
• Industrial and automotive audio power supplies
• 5V, 12V, and 24V distributed power systems

Key features

• 3.5V to 28V input voltage range
• Adjustable output voltage down to 0.8V
• Integrated 80mΩ high-side MOSFET
• Up to 3A continuous output current
• High efficiency at light load via pulse-skip Eco-mode
• 570kHz fixed switching frequency
• 1μA shutdown quiescent current (typical)
• Adjustable soft-start for inrush current limiting
• Programmable UVLO threshold
• Overvoltage transient protection
• Cycle-by-cycle current limiting, frequency foldback, and thermal shutdown protection
• Available in easy-to-use SOIC8 or thermally enhanced SOIC8 PowerPAD package
• Create custom designs with TPS54331 using WEBENCH PowerDesigner