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LTC3541-1 Datasheet(PDF) 8 Page - Linear Technology |
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LTC3541-1 Datasheet(HTML) 8 Page - Linear Technology |
8 / 20 page LTC3541-1 35411fa OPERATIO TheLTC3541-1containsahighefficiencysynchronous buckconverter,averylowdropoutregulator(VLDO)and alinearregulator.Itcanbeusedtoprovideuptotwo outputvoltagesfromasingleinputvoltagemakingthe LTC3541-1idealforapplicationswithlimitedboardspace. Thecombinationandconfigurationofthesemajorblocks withintheLTC3541-1isdeterminedbywayofthecontrol pinsENBUCKandENVLDOasdefinedinTable1. WiththeENBUCKpindriventoalogichighandENVLDO driventoalogiclow,theLTC3541-1enablesthebuck converter to efficiently reduce the voltage provided at theVINinputpintoanoutputvoltagewhichissetbyan externalfeedbackresistornetwork.Thebuckregulator canbeconfiguredforPulse-SkiporBurstModeopera- tionbydrivingtheMODEpintoalogichighorlogiclow respectively.Thebuckregulatoriscapableofprovidinga maximumoutputcurrentof500mA,whichmustbetaken intoconsiderationwhenusingthebuckregulatortoprovide thepowerforboththeVLDOandforexternalloads. WiththeENBUCKpindriventoalogiclowandENVLDO driventoalogichigh,theLTC3541-1enablesthelinear regulator,providingalownoiseregulatedoutputvoltage attheLVOUTpinwhiledrawingminimalquiescentcurrent fromtheVINinputpin.Thisfeatureallowsoutputvoltage LVOUTtobebroughtintoregulationwithoutthepresence oftheLVINvoltage. With the ENBUCK and ENVLDO pins both driven to a logic high, the LTC3541-1 enables the high efficiency buckconverterandVLDOregulator,providingdualoutput operationfromasingleinputvoltage.Whenconfigured inthismanner,theLTC3541-1’sautostart-upsequencing featurewillbringtheVLDO/linearregulatoroutputinto regulationinacontrolledmannerpriortoenablingthe FU CTIO AL BLOCK DIAGRA – + VLDO/LINEAR REG LFB 35411 F01 PGND GND 500mA BUCK SW VIN REF ENVLDO MODE FB GND PGND REF REF LFB CNTRL GND LVIN VIN CONTROL LOGIC 4 LVIN 6 BUCKFB IOUT(BUCK) = 500mA LVOUT 5 8 ENBUCK VIN VIN(MIN) ≥ LVOUT + 1.4V SW 1 10 10 µF 22pF 2.2 µF LVOUT(MAX) < VIN – 1.4V IOUT = 300mA (VLDO REG) IOUT = 30mA (LINEAR REG) 2.2 µH 11 7 3 2 9 Figure 1. LTC3541-1 Functional Block Diagram |
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