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VIN

SW

BST

LM34919B

VCC

SS

RON/SD

6V - 40V

Input

C1

R

ON

R2

R1

C2

V

OUT

L1

C3

C4

D1

C6

RTN

ISEN

SGND

FB

SHUTDOWN

R3

LM34919B

LM34919B-Q1

www.ti.com

SNVS623B–MAY2010–REVISEDJULY2013

LM34919BUltra-Small40-V600-mAConstantOn-Time

BuckSwitchingRegulator

CheckforSamples:LM34919B,LM34919B-Q1

1

FEATURES

TYPICALAPPLICATIONS

2

•AEC-Q100Grade1Qualified(-40°Cto125°C)

•AutomotiveSafetyandInfotainment

•MaximumSwitchingFrequency:2.6MHz•HighEfficiencyPoint-Of-Load(POL)Regulator

(V

IN

=14V,V

o

=3.3V)

•Non-IsolatedTelecommunicationBuck

•InputVoltageRange:6Vto40VRegulator

•IntegratedN-ChannelBuckSwitch•SecondaryHighVoltagePostRegulator

•IntegratedStartupRegulator

DESCRIPTION

•NoloopcompensationRequired

TheLM34919BStep-DownSwitchingRegulator

•Ultra-FasttransientResponse

featuresallofthefunctionsneededtoimplementa

•Operatingfrequencyremainsconstantwith

lowcost,efficient,buckbiasregulatorcapableof

LoadCurrentandInputVoltage

supplying0.6Atotheload.Thisbuckregulator

containsanN-ChannelBuckSwitch,andisavailable

•MaximumDutyCycleLimitedDuringStartup

ina10-pinDSBGApackage.Theconstanton-time

•AdjustableOutputVoltage

feedbackregulationschemerequiresnoloop

•ValleyCurrentLimitAt0.64A

compensation,resultsinfastloadtransientresponse,

andsimplifiescircuitimplementation.Theoperating

•PrecisionInternalReference

frequencyremainsconstantwithlineandload

•LowBiasCurrent

variationsduetotheinverserelationshipbetweenthe

•HighlyEfficientOperation

inputvoltageandtheon-time.Thevalleycurrentlimit

resultsinasmoothtransitionfromconstantvoltageto

•ThermalShutdown

constantcurrentmodewhencurrentlimitisdetected,

•10-PinDSBGAPackage

reducingthefrequencyandoutputvoltage,without

theuseoffoldback.Additionalfeaturesinclude:VCC

under-voltagelockout,thermalshutdown,gatedrive

under-voltagelockout,andmaximumdutycycle

limiter.

BasicStep-DownRegulator

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2010–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties