Wide Input Voltage Range: 5.5 V to 36 V

• Up to 5-A Continuous (6-A Peak) Output Current

• High Efficiency Greater than 90% Enabled by 110-mΩ Integrated MOSFET Switch

• Wide Output Voltage Range: Adjustable Down to 1.22 V with 1.5% Initial Accuracy

• Internal Compensation Minimizes External Parts Count

• Fixed 500 kHz Switching Frequency for Small Filter Size

• 18 µA Shut Down Supply Current

• Improved Line Regulation and Transient Response by Input Voltage Feed Forward 

• System Protected by Overcurrent Limiting,Overvoltage Protection and Thermal Shutdown

• –40°C to 125°C Operating Junction Temperature Range

• Available in Small Thermally Enhanced 8-Pin SOIC PowerPAD™ Package

APPLICATIONS

• High Density Point-of-Load Regulators

• LCD Displays, Plasma Displays

• Battery Chargers

• 12-V/24-V Distributed Power Systems

DESCRIPTION

As a member of the SWIFT™ family of DC/DC regulators, the TPS5450 is a high-output-current PWM converter that integrates a low resistance high side N-channel MOSFET.

Included on the substrate with the listed features are a high performance voltage error amplifier that provides tight voltage regulation accuracy under transient conditions; anundervoltage-lockout circuit to prevent start-up until the input voltage reaches 5.5 V; an internally set slow-start circuit to limit inrush currents; and avoltage feed-forward circuit to improve the transient response.

Using the ENA pin, shutdown supply current is reduced to 18 µA typically. Other features include an active-high enable, overcurrent limiting,overvoltage protection and thermal shutdown.

To reduce design complexity and external component count, the TPS5450 feedback loop is internally compensated.The TPS5450 device is available in a thermally enhanced, 8-pin SOIC PowerPAD™ package.

TI provides evaluation modules and software tool to aid in achieving high-performance power supply designs to meet aggressive equipment development cycles.

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