脚位不同 ST LM337

regulator

LM137/LM237

LM337

.........

THREE-TERMINALADJUSTABLENEGATIVEVOLTAGEREGULATORS

OUTPUTVOLTAGEADJUSTABLEDOWNTOVref

1.5AGUARANTEEDOUTPUTCURRENT0.3%/VTYPICALLOADREGULATION0.01%/VTYPICALLINEREGULATION

CURRENTLIMITCONSTANTWITHTEM-PERATURE

RIPPLEREJECTION:77dB

STANDARD3-LEADTRANSISTORPACK-AGES

EXCELLENTTHERMALREGULATION:0.002%/V

50ppm/°CTEMPERATURECOEFFICIENT

TO-3

DESCRIPTION

TheLM137seriesareadjustable3-terminalnega-tivevoltageregulatorscapableofsupplyinginex-cess-1.5Aovera-1.2to-37Voutputvoltagerange.Theyareexceptionallyeasytouseandrequireonlytwoexternalresistorstosettheoutputvoltage.Fur-ther,bothlineandloadregulationarebetterthanstandardfixedregulators.Also,LM137regulatorsaresuppliedinstandardtransistorpackageswhichareeasilymountedandhandled.Inadditiontohigherperformancethanfixedregulators,theLM137seriesofferfulloverloadprotectionavailableonlyinintegratedcircuits.Includedonthechiparecurrentlimit,thermaloverloadprotectionandsafeareaprotection.Alloverloadprotectioncircuitryre-mainsfullyfunctionaleveniftheadjustmentterminalisdisconnected.PINCONNECTIONS

TO-3(bottomview)

TO-39(bottomview)

TO-220

TO-39

TO-220(frontview)

1-Adj2-Output3-Input

1-Output2-Adj

Caseisinput1-Adj2-Output3-input

Heatsinksurfaceconnectedtoinput

March19931/14

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