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TPS54521RHLR Datasheet(PDF) 1 Page - Texas Instruments |
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TPS54521RHLR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 35 page 70 75 80 85 90 95 100 1 2 3 4 5 Load Current - A 50 55 60 65 0 VIN = 12 V Fsw = 500 kHz VOUT = 5 V VOUT = 3.3 V VOUT = 1.8 V VOUT = 1.2 V PH PVIN GND BOOT VSENSE COMP TPS54521 EN RT/CLK SS/TR Exposed Thermal PAD Css Rrt R3 C1 Cboot Co Lo R1 R2 Cin C2 VIN VIN VOUT PWRGD TPS54521 www.ti.com SLVS981 – JUNE 2010 4.5V to 17V Input, 5A Synchronous Step Down SWIFT™ Converter Check for Samples: TPS54521 1 FEATURES • Power Good Output for Undervoltage & Overvoltage Monitoring • Integrated 57m Ω / 50mΩ MOSFETs • Adjustable Input Undervoltage Lockout • Split Power Rail: 1.6V to 17V on PVIN • Supported by SwitcherPro™ Software Tool • 200kHz to 900kHz Switching Frequency • For SWIFT™ Documentation and • Synchronizes to External Clock SwitcherPro™, visit http://www.ti.com/swift • 0.8V Voltage Reference • Low 2uA Shutdown Quiescent Current APPLICATIONS • Hiccup Overcurrent Protection • Flat Panel Digital TVs • Monotonic Start-Up into Prebiased Outputs • Set Top Boxes, Personal Video Recorders • –40°C to 125°C Operating Junction • Net Books Temperature Range • High Density 3.3V/5V Power Distribution from 12 V Bus • Pin-to-Pin Compatible with the TPS54620 • Adjustable Slow Start/Power Sequencing DESCRIPTION The TPS54521 is a full featured 17V, 5A synchronous step down converter which is optimized for small designs through high efficiency and integrated 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 inductor's footprint. The output voltage startup 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. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54521 is available in a 14 pin, 3.5mm x 3.5mm QFN, thermally enhanced package. WHITE SPACE SIMPLIFIED SCHEMATIC 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. PRODUCTION DATA information is current as of publication date. Copyright © 2010, 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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