Texas Instruments LM3668 Bedienungsanleitung

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FB

2.8V/3.3V

SW1

SW2

EN

LM3668

PVIN

PGND

SYNC/MODE

VSEL

L = 2.8V

H = 3.3V

VIN = 2.5V - 5.5V

SGND

VOUT

VDD

C2

22 PF

C1

10 PF

2.2 PH

NC

Product

Folder

Sample &

Buy

Technical

Documents

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Software

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Community

LM3668

SNVS449O–JUNE2007–REVISEDAPRIL2015

LM36681-A,High-EfficiencyDual-ModeSingle-InductorBuck-BoostDC-DCConverter

1Features2Applications

1

•45-µATypicalQuiescentCurrent

•HandsetPeripherals

•For2.8-V-3.3-Vand3-V-3.4-VVersions:•MP3Players

•Pre-RegulationforLinearRegulators

–1-AMaximumLoadCurrentfor

V

IN

=2.8Vto5.5V

•PDAs

–800-mAMaximumLoadCurrentfor

•PortableHardDiskDrives

V

IN

=2.7V

•WiMaxModems

–600-mAMaximumLoadCurrentfor

V

IN

=2.5V

3Description

•For4.5V-5V

TheLM3668isasynchronousbuck-boostDC-DC

converteroptimizedforpoweringlowvoltagecircuits

–1-AMaximumLoadCurrentfor

fromaLi-Ionbatteryandinputvoltagerailsbetween

V

IN

=3.9Vto5.5V

2.5Vand5.5V.Ithasthecapabilitytosupportupto

–800-mAMaximumLoadCurrentfor

1-Aoutputcurrentovertheoutputvoltagerange.The

V

IN

=3.4Vto3.8V

LM3668regulatestheoutputvoltageoverthe

completeinputvoltagerangebyautomatically

–700-mAMaximumLoadCurrentfor

switchingbetweenbuckorboostmodesdepending

V

IN

=3Vto3.3V

ontheinputvoltage.

–600-mAMaximumLoadCurrentfor

TheLM3668has2N-channelMOSFETSand2P-

V

IN

=2.7Vto2.9V

channelMOSFETSarrangedinatopologythat

•2.2-MHzPWMFixedSwitchingFrequency

providescontinuousoperationthroughthebuckand

(Typical)

boostoperatingmodes.ThereisaMODEpinthat

•AutomaticPFM-PWMModeorForcedPWM

allowstheusertochoosebetweenanintelligent

Mode

automaticPFM-PWMmodeoperationandforced

PWMoperation.DuringPWMmode,afixed-

•WideInputVoltageRange:2.5Vto5.5V

frequency2.2MHz(typical)isused.PWMmode

•InternalSynchronousRectificationforHigh

drivesloadupto1A.HystereticPFMmodeextends

Efficiency

thebatterylifethroughreductionofthequiescent

•InternalSoftStart:600-µsMaximumStart-Up

currentto45µA(typical)atlightloadsduringsystem

TimeAfterV

IN

Settled

standby.Internalsynchronousrectificationprovides

highefficiency.Inshutdownmode(ENpinpulled

•0.01-µATypicalShutdownCurrent

low),thedeviceturnsoffandreducesbattery

•CurrentOverloadandThermalShutdown

consumptionto0.01µA(typical).

Protection

Ahighswitchingfrequencyof2.2MHz(typical)

•FrequencySyncPin:1.6MHzto2.7MHz

allowstheuseoftinysurface-mountcomponents

includinga2.2-µHinductor,a10-µFinputcapacitor,

TypicalApplicationCircuit

anda22-µFoutputcapacitor.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LM3668WSON(12)3.00mmx3.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Produktspezifikationen