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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 / 44 page  LTC7812 1 7812fc For more information www.linear.com/LTC7812 TYPICAL APPLICATION DESCRIPTION Low IQ, 38V Synchronous Boost+Buck Controller The LTC®7812 is a high performance synchronous Boost+Buck DC/DC switching regulator controller that drives all N-channel power MOSFET stages. It contains independentstep-up(boost)andstep-down(buck)control- lers 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 LTC7812 operates from a wide 4.5V to 38V input supply range.Whenbiasedfromtheoutputoftheboostregulator, the LTC7812 can operate from an input supply as low as 2.5V after start-up. The 33μA no-load quiescent current extends operating run time in battery-powered systems. Unlikeconventionalbuck-boostregulators,theLTC7812’s cascaded Boost+Buck solution has continuous, non- pulsating,inputandoutputcurrents,substantiallyreducing voltage ripple and EMI. The LTC7812 has independent feedback and compensation points for the boost and buck regulation loops, enabling a fast output transient response that can be easily optimized externally. L , LT, LTC, LTM, Burst Mode, OPTI-LOOP and µModule are registered trademarks and No RSENSE is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. FEATURES APPLICATIONS n Synchronous Boost and Buck Controllers n When Cascaded, Allows VIN Above, Below or Equal to Regulated VOUT n Output Remains in Regulation Through Input Dips (e.g., Cold Crank) Down to 2.5V n Wide Bias Input Voltage Range: 4.5V to 38V n Low Input and Output Ripple n Low EMI n Fast Output Transient Response n High Light Load Efficiency n Low Operating IQ: 33µA (Both Channels On) n Low Operating IQ: 28µA (Buck Channel On) n RSENSE or Lossless DCR Current Sensing n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n Boost Output Voltage Up to 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 Wide Input Range to 12V/8A Low IQ, Cascaded Boost+Buck Regulator VIN 5V TO 38V DOWN TO 2.5V AFTER START-UP 33µF 6.8µF 0.1µF 0.1µF 4.7µF VOUT 12V 8A* VMID, 14V** 2m 1µH 3m 4.7µH 499k 35.7k FREQ INTVCC VFB2 RUN1 15k 4.7nF 0.01µF 0.1µF 100pF EXTVCC SS2 ITH1 SGND 7812 TA01a RUN2 ITH2 SENSE2– SENSE2+ VFB1 PGND VBIAS TG2 SW2 BOOST2 BG2 BG1 BOOST1 SW1 TG1 SENSE1+ SENSE1– PLLIN/MODE TRACK/SS1 LTC7812 1.86k 6.8nF 820pF 6.8µF + 47µF 22µF + 33µF 499k 46.4k + * WHEN VIN < 8V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED ** VMID = 14V WHEN VIN < 14V VMID FOLLOWS VIN WHEN VIN > 14V |
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