TPS54531DDAR Power Path Management IC Switching Voltage Regulators 3.5-28V Input,5A 570kHz

1 Features

• 3.5 to 28-V Input Voltage Range

• Adjustable Output Voltage Down to 0.8 V

• Integrated 80-mΩ High-Side MOSFET Supports up to 5-A Continuous Output Current

• High Efficiency at Light Loads with a Pulse Skipping Eco-modeTM

• Fixed 570kHz Switching Frequency

• Typical 1μA Shutdown Quiescent Current

• Adjustable Slow Start Limits Inrush Currents

• Programmable UVLO Threshold

• Overvoltage Transient Protection

• Cycle-by-Cycle Current-Limit, Frequency Fold Back, and Thermal Shutdown Protection

• Available in Easy-to-Use Thermally Enhanced 8-Pin SO PowerPADTM Package

2 Applications

• Consumer Applications such as Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers

• Industrial and Car Audio Power Supplies

• 5-V, 12-V and 24-V Distributed Power Systems

3 Description

The TPS54531 device is a 28-V, 5-A non- synchronous buck converter that integrates a low RDS(on) high-side MOSFET. To increase efficiency at light loads, a pulse skipping Eco-mode feature is automatically activated. Furthermore, the 1-μA shutdown supply current allows the device to be used in battery powered applications. Current mode control with internal slope compensation simplifies the external compensation calculations and reduces component count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis of the input under-voltage lockout. An overvoltage transient protection circuit limits voltage overshoots during startup and transient conditions. A cycle-by-cycle current-limit scheme, frequency fold back, and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54531 TMdevice is available in 8-pin SO PowerPAD package that has been internally optimized to improve thermal performance.