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LTC3858IUFD-1 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3858IUFD-1 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 38 page  LTC3858-1 0 38581fb FuncTional DiagraM SW TOP BOOST TG CB CIN D DB PGND BOT BG INTVCC INTVCC VIN COUT VOUT 38581 FD RSENSE DROP OUT DET BOT TOP ON S R Q Q SHDN SLEEP 0.425V ICMP 2(VFB) 0.45V IR 3mV SLOPE COMP DUPLICATE FOR SECOND CONTROLLER CHANNEL SENSE+ SENSE– PGOOD1 VFB1 0.88V 0.72V L FREQ + – + – SWITCH LOGIC VFB RA CC RC CC2 RB 0.80V TRACK/SS 0.88V 0.5µA 10V RUN ITH SS CSS 1µA SHDN 10µA FOLDBACK SHDN RST 2(VFB) SHORT CKT LATCH-OFF PLLIN/MODE 20µA VCO LDO EN INTVCC 5.1V SYNC DET 100k CLK2 CLK1 VIN EXTVCC LDO PFD EN 4.7V 5.1V SGND EA OV Main Control Loop TheLTC3858-1usesaconstantfrequency,currentmode step-downarchitecturewiththetwocontrollerchannels operating180degreesoutofphase.Duringnormalop- eration,eachexternaltopMOSFETisturnedonwhenthe clockforthatchannelsetstheRSlatch,andisturnedoff whenthemaincurrentcomparator,ICMP,resetstheRS latch.ThepeakinductorcurrentatwhichICMPtripsand resetsthelatchiscontrolledbythevoltageontheITHpin, whichistheoutputoftheerroramplifier,EA.Theerror amplifiercomparestheoutputvoltagefeedbacksignalat operaTion theVFBpin(whichisgeneratedwithanexternalresistor divider connected across the output voltage, VOUT, to ground)totheinternal0.800Vreferencevoltage.Whenthe loadcurrentincreases,itcausesaslightdecreaseinVFB relativetothereference,whichcausestheEAtoincrease theITHvoltageuntiltheaverageinductorcurrentmatches thenewloadcurrent. AfterthetopMOSFETisturnedoffeachcycle,thebottom MOSFETisturnedonuntileithertheinductorcurrentstarts toreverse,asindicatedbythecurrentcomparatorIR,or thebeginningofthenextclockcycle. |
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