TPS54331DR

IC REG BUCK ADJ 3A 8SOIC

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 3-A continuous output current 

• High efficiency at light loads with a pulse skipping Eco-mode 

• Fixed 570-kHz switching frequency

• Typical 1-μA shutdown quiescent current 

• Adjustable slow-start limits inrush currents 

• Programmable UVLO threshold

• Overvoltage transient protection

• Cycle-by-cycle current limit, frequency foldback, and thermal shutdown protection 

• Available in easy-to-use SOIC8 package or thermally-enhanced SOIC8 PowerPAD™ integrated circuit package 

• Create a custom design using the TPS54331 with the WEBENCH® Power Designer 

• Use TPS62933 for a 30 VIN converter with higher frequency, lower IQ and improved EMI

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 TPS54331 device is a 28-V, 3-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 undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots during start-up and transient conditions. A cycle-by-cycle current-limit scheme, frequency foldback and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54331 device is available in an 8-pin SOIC package and 8-pin SO PowerPAD integrated circuit package that have been internally optimized to improve thermal performance.