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LTC3541 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC3541
Description  High Efficiency Buck VLDO Regulator
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3541 Datasheet(HTML) 7 Page - Linear Technology

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LTC3541

3541fa
PI FU CTIO S
Table 1. LTC3541 Control Pin Truth Table
PIN NAME
OPERATIONAL DESCRIPTION
ENBUCK ENVLDO MODE
0
0
X
LTC3541PoweredDown
0
1
X
BuckPoweredDown,VLDORegulator
PoweredDown,LinearRegulator
Enabled
1
0
0
BuckEnabled,VLDORegulatorPowered
Down,LinearRegulatorPoweredDown,
BurstModeOperation
1
0
1
BuckEnabled,VLDORegulatorPowered
Down,LinearRegulatorPoweredDown,
Pulse-SkipModeOperation
1
1
0
BuckEnabled,VLDORegulatorEnabled,
LinearRegulatorPoweredDown,Burst
ModeOperation
1
1
1
BuckEnabled,VLDORegulatorEnabled,
LinearRegulatorPoweredDown,Pulse-
SkipModeOperation
VIN (Pin 1):MainSupplyPin.Thispinmustbeclosely
decoupledtoGNDwitha10µForgreatercapacitor.
ENBUCK (Pin 2):BuckEnablePin.Thispinenablesthe
buckregulatorwhendriventoalogichigh.
BUCKFB (Pin 3):BuckRegulatorFeedbackPin.Thispin
receivesthebuckregulator’sfeedbackvoltagefroman
externalresistivedivider.
LFB (Pin 4):VLDO/LinearRegulatorFeedbackPin.This
pinreceiveseithertheVLDOorlinearregulator’sfeedback
voltagefromanexternalresistivedivider.
LVOUT (Pin 5):VLDO/LinearRegulatorOutputPin.This
pinprovidestheregulatedoutputvoltagefromtheVLDO
orlinearregulator.
LVIN (Pin 6):VLDO/LinearRegulatorInputSupplyPin.
ThispinprovidestheinputsupplyvoltagefortheVLDO
powerFET.
GND (Pin 7):AnalogGroundPin.
MODE (Pin 8):BuckModeSelectionPin.Thispinenables
buckPulse-Skipoperationwhendriventoalogichigh
andenablesbuckBurstModeoperationwhendrivento
alogiclow.
ENVLDO (Pin 9): VLDO/Linear Regulator Enable Pin.
Whendriventoalogichigh,thispinenablesthelinear
regulatorwhentheENBUCKpinisdriventoalogiclow,
andenablestheVLDOwhentheENBUCKpinisdrivento
alogichigh.
SW (Pin 10): Switch Node Pin. This pin connects the
internalmainandsynchronouspowerMOSFETswitches
totheexternalinductorforthebuckregulator.
Exposed Pad (Pin 11): Ground Pin. This pin must be
solderedtothePCBtoprovidebothelectricalcontactto
groundandgoodthermalcontacttothePCB.
Note:Table1detailsthetruthtableforthecontrolpins
oftheLTC3541.



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