TPS54231

具有 Eco-mode™ 的 3.5 至 28V 输入、2A、570kHz 降压转换器

The device is a 2-V, 2-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 fold back and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54231 device is available in an 8-pin SOIC package that has 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 2 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

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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

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