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LT8705 Datasheet(PDF) 1 Page - Linear Technology |
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LT8705 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 42 page  LTC7813 1 7813f For more information www.linear.com/LTC7813 Typical applicaTion FeaTures DescripTion Low IQ, 60V Synchronous Boost+Buck Controller The LTC®7813 is a high performance synchronous Boost+Buck DC/DC switching regulator controller that drives all N-channel power MOSFET stages. It contains independent step-up (boost) and step-down (buck) controllers that can regulate two separate outputs or be cascaded to regulate an output voltage from an input voltage that can be above, below, or equal to the output voltage. The LTC7813 operates from a wide 4.5V to 60V input supply range. When biased from the output of the boost regulator, the LTC7813 can operate from an input supply as low as 2.2V after start-up. The 34μA no-load quiescent current (both channels on) extends operating runtime in battery-powered systems. Unlikeconventionalbuck-boostregulators,the LTC7813’s cascaded Boost+Buck solution has continuous, non- pulsating,inputandoutputcurrents,substantiallyreducing voltage ripple and EMI. The LTC7813 has independent feedback and compensation points for the boost and buck regulation loops, enabling a fast output transient response that can be externally optimized. applicaTions n Synchronous Boost and Buck Controllers n When Cascaded, Allows VIN Above, Below, or Equal to Regulated VOUT of Up to 60V n Wide Bias Input Voltage Range: 4.5V to 60V n Output Remains in Regulation Through Input Dips (e.g. Cold Crank) Down to 2.2V n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) n Low EMI with Low Input and Output Ripple n Fast Output Transient Response n No External Bootstrap Diodes Required n High Light Load Efficiency n Low Operating IQ: 29µA (One Channel On) n Low Operating IQ: 34µA (Both Channels On) n RSENSE or Lossless DCR Current Sensing n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 60V n Boost Output Voltage Up 60V n Phase-Lockable Frequency (75kHz to 850kHz) n Small 32-Pin 5mm × 5mm QFN Package n Automotive and Industrial Power Systems n High Power Battery Operated Systems L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Wide Input Range to 10V/10A Low IQ Cascaded Boost+Buck Regulator 2.2µH 10µH 1.62k 15k 2.32k RB1 332k RA1 11.5k 0.1µF 1µF 0.1µF 6.8µF ×4 47µF 47µF 47µF 0.1µF 0.1µF 22µF ×3 22µF ×3 33pF 100pF 3300pF 8.87k VIN 470pF 22nF 6.19k 0.1µF 0.1µF 4.7µF 37.4k SENSE2+ SENSE2– BG2 SW2 BOOST2 TG2 INTVCC GND VFB2 VBIAS TG1 BOOST1 SW1 BG1 SENSE1+ SENSE1– VFB1 EXTVCC VOUT 10V 10A* VIN 8V TO 60V DOWN TO 2.2V AFTER START-UP RUN1 RUN2 ITH1 ITH2 TRACK/SS1 SS2 FREQ PLLIN/MODE ILIM DRVUVDRVSET DRVCC VMID, 12V** * WHEN VIN <8V MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED **VMID = 12V WHEN VIN < 12V VMID FOLLOWS VIN WHEN VIN > 12V LTC7813 VPRG2 7813 TA01 |
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