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TPS5450DDA-TPS5450DDAG4-TPS5450DDAR-TPS5450DDARG4
5.5V to 36V Input, 5A, 500kHz Step Down Converter
VIN
ENA
GND
VSENSE
BOOTVIN VOUT
Simplified Schematic Efficiency vs Output CurrentEfficiency - % 1 2 3 4 5 6 = 12 V, = 5 V, = 500 kHz, = 25°C
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TPS5450SLVS757D –MARCH 2007–REVISED DECEMBER 2014
TPS5450 5-A, Wide Input Range, Step-Down Converter Features 3 DescriptionThe TPS5450 is a high-output-current PWM Wide Input Voltage Range: 5.5Vto 36V converter that integratesa low-resistance, high-side• Upto 5-A Continuous (6-A Peak) Output Current N-channel MOSFET. Included on the substrate with• High Efficiency Greater Than 90% Enabledby the listed features area high-performance voltage
110-mΩ Integrated MOSFET Switch error amplifier that provides tight voltage regulation
accuracy under transient conditions;an undervoltage-• Wide Output Voltage Range: Adjustable Downto lockout circuit to prevent start-up until the input1.22V With 1.5% Initial Accuracy voltage reaches 5.5 V; an internally set slow-start• Internal Compensation Minimizes External Part circuitto limit inrush currents; anda voltage feed-Count forward circuit to improve the transient response. Fixed 500-kHz Switching Frequency for Small Using the ENA pin, shutdown supply current is
reducedto18 μA typically. Other features include anFilter Size
active-high enable, overcurrent limiting, overvoltage• 18-μA Shutdown Supply Current protection and thermal shutdown. To reduce design• Improved Line Regulation and Transient complexity and external component count, theResponseby Input Voltage Feed Forward TPS5450 feedback loopis internally compensated. System Protectedby Overcurrent Limiting, The TPS5450 deviceis available ina thermally-Overvoltage Protection and Thermal Shutdown enhanced, 8-pin SOIC PowerPAD package. TI –40°Cto 125°C Operating Junction Temperature provides evaluation modules and software toolto aid
Range in achieving high-performance power supply designs meet aggressive equipment development cycles.• Availablein Small Thermally Enhanced 8-Pin
SOIC PowerPAD™ Package
Device Information(1)2 Applications• High Density Point-of-Load Regulators
(1) Forall available packages, see the orderable addendumat• LCD Displays, Plasma Displays the endofthe datasheet. Battery Chargers 12-V and 24-V Distributed Power Systems
