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VIN (2.8V to 5.5V)

LMR70503

GND

SW

VOUT

VIN

EN

Cin

Cout

Refer to GND

D

VOUT

L

0V

1.8V

(-0.9V to -5.5V)

FB

VREF

Rb

Rt

Cff

0306090120150180

30

40

50

60

70

80

EFFICIENCY (%)

LOAD (mA)

VIN = 2.8V

VIN = 3.3V

VIN = 4.0V

VIN = 5.0V

VIN = 5.5V

0102030405060708090100

30

40

50

60

70

80

EFFICIENCY (%)

LOAD (mA)

VIN = 2.8V

VIN = 3.3V

VIN = 4.0V

VIN = 5.0V

VIN = 5.5V

LMR70503

www.ti.com

SNVS850A–JUNE2012–REVISEDAPRIL2013

LMR70503SIMPLESWITCHER

®

Buck-BoostConverterForNegativeOutputVoltagein

µSMD

CheckforSamples:LMR70503

SystemPerformance

1

FEATURES

23

•Tiny8-BumpThinDSBGAPackage:0.84mm×

1.615mm×0.6mm

•2.8Vto5.5VInputVoltageRange

•AdjustableOutputVoltage:-0.9Vto-5.5V

•320mASwitchCurrentLimit

•500kHzMinimumSwitchingFrequency

•GroundReferredEnableInput

•UnderVoltageLockOut(UVLO)

•NoExternalCompensation

•InternalSoftStart

•1µAShutdownSupplyCurrent

Figure1.Efficiency,V

OUT

=-5.0V

•SmallOutputVoltageRipple

•WEBENCH

®

Enabled

APPLICATIONS

•GeneralPurposeNegativeVoltageSupply

•NegativeRail/BiasSupplyForOp-ampAnd

DataConverters

•LCDBiasing

PERFORMANCEBENEFITS

•EasyToUse

•TinyOverallSolutionSizeReducesSystem

Cost

Figure2.Efficiency,V

OUT

=-2.5V

DESCRIPTION

TheLMR70503isabuck-boostconverterwith

adjustablenegativeoutputvoltageinatiny8-bump

TypicalApplicationCircuit

thinDSBGApackage.Itsuniquecontrolmethodis

designedtoprovidefasttransientresponse,low

outputnoise,highefficiency,andtightregulationin

thesmallestpossiblePCBarea.TheLMR70503has

builtinsoftstart,peakcurrentlimit,minimum

switchingfrequency,andUnderVoltageLockOut

(UVLO),withnoexternalcompensationrequired.For

easeofuse,theEnablepinisreferredtotheIC

ground,insteadofthelowestpotentialoftheIC:the

negativeoutputvoltage.

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2SIMPLESWITCHER,WEBENCHareregisteredtrademarksofTexasInstruments.

3Allothertrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2012–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer