TPS54331

具有 Eco-mode 的 3.5V 至 28V 输入、3A、570kHz 降压转换器

The device is a 28-V, 3-A non-synchronous buck converter that integrates a low RDSon 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 startup 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 package that have been internally optimized to improve thermal performance.

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3.5 to 28-V Input Voltage Range

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Adjustable Output Voltage Down to 0.8 V

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Integrated 80-mΩ High-Side MOSFET

Supports up to 3-A Continuous Output

Current

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High Efficiency at Light Loads With a

Pulse Skipping Eco-mode™

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Fixed 570 kHz Switching Frequency

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Typical 1-µA Shutdown Quiescent

Current

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Adjustable Slow-Start Limits Inrush

Currents

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Programmable UVLO Threshold

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Overvoltage Transient Protection

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Cycle-by-Cycle Current Limit, Frequency Fold

Back, and Thermal Shutdown Protection

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Available in Easy-to-Use SOIC8 Package or

Thermally Enhanced SOIC8 PowerPAD™ Package

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Supported by WEBENCH® Software Tool

www..com/WEBENCH

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APPLICATIONS

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Consumer Applications such as Set-Top Boxes,

CPE Equipment, LCD Displays, Peripherals, and

Battery Chargers

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Industrial and Car-Audio Power Supplies

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

WEBENCH Is a trademark of Texas Instruments

All other trademarks are the property of their respective owners