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TPS56921PWPR 데이터시트(PDF) 1 Page - Texas Instruments |
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TPS56921PWPR 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 39 page PH PVIN GND BOOT VSENSE COMP EN RT/CLK SS PowerPAD Css Rrt R3 C1 Cboot Co Lo R1 R2 Cin VIN VIN VOUT PWRGD SDA SCL VDD Rp1 Rp2 SDA SCL VOUT A1 A0 ADDR1 ADDR0 0 10 20 30 40 50 60 70 80 90 100 0 1 2 3 4 5 6 7 8 9 Output Current - A C007 V IN = 12 V V IN = 5 V SIMPLIFIED SCHEMATIC EFFICIENCY Fsw = 500 kHz, V = 1.1 V OUT TPS56921 www.ti.com SLVSBL4 – OCTOBER 2012 4.5V to 17V Input, 9A Synchronous Step Down SWIFT™ Converter With VID Control Check for Samples: TPS56921 1 FEATURES • Overcurrent Protection for Both MOSFETs with Hiccup Mode for Severe Fault Conditions • VID Control Range via I2C Compatible • Thermal and Overvoltage Protection Interface: 0.72V to 1.48V in 10mV Steps • Adjustable Soft Start • I2C Addressing Flexibility: 2 Bits by IC pins • Power Good Monitor for Under- and Over- • ±1.5% Output Voltage over Temperature for Voltage Conditions VID Control • Operating Junction Temperature Range: –40°C • ±1% Reference Voltage over Temperature for to 125°C External Regulation Mode • Available in 20-Pin HTSSOP Package with • Integrated 26m Ω / 19mΩ MOSFETs PowerPADTM • Power Input PVIN Voltage Range: 1.6V to 17V • Switching Frequency: 200kHz to 1.6MHz APPLICATIONS Internal Oscillator or Synchronizing to • Digital TVs External Clock • Set Top Boxes • Shutdown Current: 2µA • SoC Power • Monotonic Start-Up into Pre-biased Output Voltage • High Density Power Distribution Systems DESCRIPTION The TPS56921 in thermally enhanced 20-pin HTSSOP package is a full featured 17V, 9A synchronous step down converter which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. After the initial power-up, the output voltage can be changed by codes sent to the IC via an I2C compatible VID Control bus. Current mode control provides space savings and easy compensation. The output voltage startup ramp is controlled by the SS pin which helps to control startup inrush current. Power sequencing is supported by configuring the enable and the open drain power good pins. The output voltage is user-configurable at startup by external voltage divider. Cycle by cycle current limiting on the high-side fet protects the TPS56921 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 which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the part when die temperature exceeds thermal shutdown temperature and enables the part again after the built-in thermal hiccup time. 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 © 2012, 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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