TPS54620RGYR 6A High-Efficiency Step-Down Converter with 4.5-17V Input Adjustable Output 1.5% Accuracy 1.2MHz Switching Thermal Protection & Power Good Signal

Features

• Integrated 26 mΩ and 19 mΩ MOSFETs

• Split Power Rail: 1.6 V to 17 V on PVIN

• 200-kHz to 1.6-MHz Switching Frequency

• Synchronizes to External Clock

• 0.8 V±1%Voltage Reference Overtemperature

• Low2-µA Shutdown Quiescent Current

• Monotonic Start-Up into Prebiased Outputs

•–40°C to 150°C Operating Junction Temperature Range

• Adjustable Slow Start and Power Sequencing

• Power Good Output Monitor for Undervoltage and Overvoltage

• Adjustable Input Undervoltage Lockout

Applications

• High Density Distributed Power Systems

• High Performance Point of Load Regulation

• Broadband, Networking and Optical Communications Infrastructure

Description

The TPS54620 in thermally enhanced 3.50 mm × 3.50 mm QFN package is a full featured 17-V, 6-A, synchronous, step-down converter which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the footprint of the inductor.

The output voltage start-up ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open-drain power good pins.

Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit that turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature.

INFORMATION

Drawing

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