LTC3890-1 FUNCTIONAL DIAGRAM INTVCC VIN DUPLICATE FOR SECOND CONTROLLER CHANNEL BOOST DB C TG B DROP TOP PGOOD1 + OUT C 0.88V IN D DET BOT – SW TOP ON VFB1 S Q + INTV R Q CC – 0.72V SWITCH BG SHDN LOGIC BOT C PGND OUT FREQ 20µA VOUT VCO CLK2 + R CLK1 0.425V SENSE SLEEP L – ICMP IR – PFD + CLP + – – + + – 3mV SENSE+ SYNC 2.7V PLLIN/MODE DET 0.65V SENSE– 100k SLOPE COMP VFB + RB VIN EA – 0.80V TRACK/SS RA EXTVCC + OV – 0.88V C ITH C 5.1V 5.1V LDO LDO 7µA (RUN1) SHDN EN EN 0.5µA (RUN2) CC2 RC RST FOLDBACK + 1µA TRACK/SS 2(VFB) – 4.7V 11V SHDN CSS SGND INTVCC RUN 38901 FD 38901fb 10 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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