TPS54233 2A, 28V Input, Step Down DC/DC Converter With Eco-mode™

1 Features

• 3.5 V to 28 V Input Voltage Range
• Adjustable Output Voltage Down to 0.8 V
• Integrated 80 mΩ High Side MOSFET Supports up to 2A Continuous Output Current
• High Efficiency at Light Loads with a Pulse Skipping Eco-mode™
• Fixed 300 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 Fold Back and Thermal Shutdown Protection
• Available in Easy-to-Use SOIC8 Package
• Supported by WEBENCH® Software Tool (www.TI.com/WEBENCH)

2 Applications

• Consumer Applications such as Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers
• Industrial and Car Audio Power Supplies
• 5V, 12V and 24V Distributed Power Systems

3 Description

The TPS54233 is a 28 V, 2 A non-synchronous buck converter that integrates a low R_DS(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 TPS54233 is available in an 8-pin SOIC package that has been internally optimized to improve thermal performance.

1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

Efficiency

5 Revision History

Changes from B Revision (February 2011) to C Revision

• Added ESD Rating table, Thermal Information table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Device and Documentation Support section, and Mechanical, Packaging sections. Go
• Deleted Features Item: For SWIFT™ Documentation, See the TI Website at www.ti.com/swiftGo
• Changed Features item: Supported by SwitcherPro™ To: Supported by WEBENCH®Go
• Changed R_O1 To: R5, R_O2 To R6, C₁ To C6, and C₂ To C7 in the Simplified SchematicGo
• Changed SwitcherPro™ Software tool To: WEBENCH Software tool in the Current Mode Compensation Design sectionGo
• Changed R_O1 To: R5, R_O2 To R6, C₁ To C6, and C₂ To C7 in the Table 1Go
• Changed the Output Voltage Set Point section. Updated the paragraph following Equation 5.Go

Changes from A Revision (March 2010) to B Revision

• Figure 14, Changed V_IN = 18 V on the top (blue) curve To: V_IN = 8 VGo

Changes from * Revision (October 2008) to A Revision

• Changed the Absolute Maximum Ratings table, Input Voltage - EN pin max value From: 5V to 6VGo
• Added A table to the Description - with text "For additional design needs, see.."Go

6 Pin Configuration and Functions

D Package

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