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TPS54340 Datasheet(PDF) 1 Page - Texas Instruments |
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TPS54340 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 43 page SW VIN GND BOOT FB COMP TPS54340 EN RT/CLK V IN V OUT R1 R3 0 10 20 30 40 50 60 70 80 100 0 0.5 1.0 1.5 2.0 I - Output Current - A O 2.5 3.0 90 3.5 V = 12V IN fsw = 600 kHz V = 3.3V OUT V = 5V OUT TPS54340 www.ti.com SLVSBK0A – OCTOBER 2012 – REVISED FEBRUARY 2013 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™ Check for Samples: TPS54340 1 FEATURES 2 • 4.5 V to 42 V (45 V Abs Max) Input Range • Adjustable UVLO Voltage and Hysteresis • 3.5 A Continuous Current, 4.5 A Minimum Peak • Internal Soft-Start Inductor Current Limit • Accurate Cycle-by-Cycle Current Limit • Current Mode Control DC-DC Converter • Thermal, Overvoltage, and Frequency • 92-m Ω High-Side MOSFET Foldback Protection • High Efficiency at Light Loads with Pulse • 0.8 V 1% Internal Voltage Reference Skipping Eco-mode™ • 8-Pin HSOIC with PowerPAD™ Package • Low Dropout at Light Loads with Integrated • –40°C to 150°C TJ Operating Range BOOT Recharge FET • Supported by WEBENCH™ Software Tool • 146 μA Operating Quiescent Current • 1 μA Shutdown Current APPLICATIONS • 100 kHz to 2.5 MHz Fixed Switching Frequency • 12 V, 24 V and 48 V Industrial, Automotive and Communications Power Systems • Synchronizes to External Clock DESCRIPTION The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 45 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146 μA. Shutdown supply current is reduced to 1 μA when the enable pin is pulled low. Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start up ramp is internally controlled to provide a controlled start up and eliminate overshoot. A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency foldback and thermal shutdown protects internal and external components during an overload condition. The TPS54340 is available in an 8-pin thermally enhanced HSOIC PowerPAD™ package. SIMPLIFIED SCHEMATIC EFFICIENCY vs LOAD CURRENT 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 Eco-mode, PowerPAD, WEBENCH are trademarks of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2012–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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