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SP6125/26/27

SP6125/26/27. 30V High-Voltage Buck Controller Family. SP6125/26/27 30V High-Voltage Buck Controller Family. SMALL SOLUTION TSOT6 Package Wide Input Voltage Range 4.5V – 30V Internal Compensation Internal Soft-Start Max. Output Current 5A Wide Output Range 0.6V-28V

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SP6125/26/27

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  1. SP6125/26/27 30V High-Voltage Buck Controller Family

  2. SP6125/26/27 30V High-Voltage Buck Controller Family • SMALL SOLUTION • TSOT6 Package • Wide Input Voltage Range 4.5V – 30V • Internal Compensation • Internal Soft-Start • Max. Output Current 5A • Wide Output Range 0.6V-28V • Constant Frequency Operation: • 300kHz (SP6125) • 600kHz (SP6126) • 900kHz (SP6127) • 0.6V Reference Voltage • 1% Feedback accuracy • Adjustable RDS(ON) Current Limit • Small TSOT-6 Package SMALLEST DC/DC Controller for 24VDC Bus systems Company Confidential

  3. SP6126 12V to 3.3V @ 2Amps Lower voltage can use smaller components Cin 16V PFET 30V SP6125 30V to 3.3V @ 3Amps Needs larger input cap to support Vin – could use SMT electrolytic of lower cost Uses 40V PFET Demo Boards Available 10K 10K Resistor on output only required for Enable function on demo board if no load on output Company Confidential

  4. Competition • LM3485 is cheaper at low volume but is a pure hysteretic controller. It will operate at variable frequency. Additional components required to work with ceramic capacitors. SP6125/6/7 same price at high volume!!! • LM3477 has minimum on-time problem at high Vin • 24Vin can not support <4Vout, SP6126 can support to 0.6V!! • Low voltage, low performance not Exar goal • TOREX SC9220 – No current limit, 16V max input • RICOH SX1224 – Unreliable current limit, 18.5V max input Company Confidential

  5. Part Details – Internal Compensation • Internal Type – II Compensation 1 or 2 external components used to develop Type-III compensation for optimization with ceramic output capacitors Company Confidential

  6. Current limit adjusted by Rs Internal soft-start avoids inrush currents Part Details Company Confidential

  7. Operating Efficiency • Efficiency is a choice between solution size and cost • SP6125 (300kHz) will be more efficient but larger • SP6127 (900kHz) will be less efficient but smaller • Higher switching frequency reduces efficiency • 5V and 12V efficiency can be improved with more costly FET • 24V efficiency shown above indicates FETs can support more output current • Efficiency has not started to drop Company Confidential

  8. Support • Excellent design section in datasheets • Demo board manuals • PowerLab simulation by end of 2007 Company Confidential

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