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FeAtures
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LTC6255/LTC6256/LTC6257 6.5MHz, 65A Power Efficient Rail-to-Rail I/O Op Amps Description
The LTC(R)6255/LTC6256/LTC6257 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, rail-to-rail input/output. They are unity gainstablewithcapacitiveloadupto100nF .Theyfeature 6.5MHzgain-bandwidthproduct,1.8V/sslewratewhile consumingonly65Aofsupplycurrentperamplifieroperatingonsupplyvoltagesrangingfrom1.8Vto5.25V.The combinationoflowsupplycurrent,lowsupplyvoltage,high gainbandwidthproductandlownoisemakestheLTC6255 familyuniqueamongrail-to-railinput/outputopampswith similarsupplycurrents.Theseoperationalamplifiersare idealforlowpowerandlownoiseapplications. Forapplicationsthatrequirepower-down,LTC6255and LTC6256 in S6 and MS10 packages offer shutdown pins which reduces the current consumption to 7A maximum. TheLTC6255familycanbeusedasplug-inreplacements formanycommerciallyavailableopampstoreducepower ortoimproveinput/outputrangeandperformance.
L,LT,LTC,LTM,LinearTechnologyandtheLinearlogoareregisteredtrademarksand Over-The-TopisatrademarkofLinearTechnologyCorporation.Allothertrademarksarethe propertyoftheirrespectiveowners.
GainBandwidthProduct:6.5MHz -3dBBandwidth(AV=+1):4.5MHz LowQuiescentCurrent:65A StableforCapacitiveLoadUpto100nF OffsetVoltage:350VMaximum Rail-to-RailInputandOutput SupplyVoltageRange:1.8Vto5.25V InputBiasCurrent:35nAMaximum CMRR/PSRR:100dB/100dB ShutdownCurrent:7AMaximum OperatingTemperatureRange:-40Cto125C Singlein6-LeadTSOT-23Package Dualin8-LeadMS8,MS10,TS0T-23,2mmx2mm ThinDFNPackages n QuadinMS16Package
ApplicAtions
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MicropowerActiveFilters PortableInstrumentation BatteryorSolarPoweredSystems AutomotiveElectronics
typicAl ApplicAtion
LowPower,LowDistortionADCDriver
0 3.3V 3.3V -10 -20 324 1% 470pF NPO 6.34k, 1% CS SDO SCK OVDD MAGNITUDE (dB) VDD AIN VREF -30 -40 -50 -60 -70 -80 10k 1%
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LTC6255DrivingLTC2361ADC
VIN = -1dBFS, 5kHz fS = 125kSps SNR = 72.5dB SFDR = 89dB tACQ = 5s tCONV = 3s
-
22pF
+
LTC6255
VIN 5mV TO 2V
LTC2361 GND
-90 -100 -110
ISUPPLY = 540A TOTAL AT 125kSps
0
10
20 30 40 FREQUENCY (kHz)
50
60
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LTC6255/LTC6256/LTC6257 Absolute MAxiMuM rAtings
(Note1)
SupplyVoltage:V+-V-...........................................5.5V InputVoltage.................................. V--0.2toV++0.2 . InputCurrent:+IN,-IN,SHDN(Note2)............... 10mA OutputCurrent:OUT........................................... 20mA OutputShort-CircuitDuration(Note3)............ Indefinite OperatingTemperatureRange (Note4)................................................. -40Cto125C .
SpecifiedTemperatureRange (Note5)................................................. -40Cto125C . StorageTemperatureRange.................. -65Cto150C JunctionTemperature........................................... 150C LeadTemperature(Soldering,10sec) S6,TS8,MS8,MSonly........................................ 300C .
pin conFigurAtion
TOP VIEW OUTA -INA +INA V
-
1 3 4
+ -
8 9 V- 7 6 5
+ -
V+ OUTB -INB +INB OUT 1 +IN 3 V- 2
TOP VIEW 6 V+
+ -
2
5 SHDN 4 -IN
KC PACKAGE 8-LEAD (2mm 2mm) PLASTIC UTDFN TJMAX=125C,JA=89C/W(NOTE6) EXPOSEDPAD(PIN9)ISV-,MUSTBESOLDEREDTOPCB TOP VIEW OUTA -INA +INA V- 1 2 3 4 8 7 6 5 V+ OUTB -INB +INB
S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX=150C,JA=192C/W(NOTE6)
TOP VIEW
+ - + -
TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX=150C,JA=195C/W(NOTE6)
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX=150C,JA=163C/W(NOTE6) TOP VIEW
TOP VIEW
+ -
MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX=150C,JA=160C/W(NOTE6)
+ -
OUTA -INA +INA V- SHDNA
1 2 3 4 5
10 9 8 7 6
+ -
MS PACKAGE 16-LEAD PLASTIC MSOP TJMAX=150C,JA=125C/W(NOTE6)
+ -
V+ OUTB -INB +INB SHDNB
OUTA -INA +INA V+ +INB -INB OUTB NC
1 2 3 4 5 6 7 8
+ -
OUTA -INA +INA V-
1 2 3 4
8 7 6 5
V+ OUTB -INB +INB
+ -
+ -
+ -
16 15 14 13 12 11 10 9
OUTD -IND +IND V- +INC -INC OUTC NC
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LTC6255/LTC6256/LTC6257 orDer inForMAtion
LEADFREEFINISH LTC6255IS6#TRMPBF TAPEANDREEL LTC6255IS6#TRPBF PARTMARKING* PACKAGEDESCRIPTION LTFFT LTFFT LTFFT LTFFW LTFFW LTFFW DXYT DXYT LTDXW LTDXX LTDXX 6257 6257 6257 6-LeadPlasticTSOT-23 6-LeadPlasticTSOT-23 6-LeadPlasticTSOT-23 8-LeadPlasticTSOT-23 8-LeadPlasticTSOT-23 8-LeadPlasticTSOT-23 SPECIFIEDTEMPERATURERANGE(Notes4,5) 0Cto70C -40Cto85C -40Cto125C 0Cto70C -40Cto85C -40Cto125C LTC6255CS6#TRMPBF LTC6255CS6#TRPBF LTC6255HS6#TRMPBF LTC6255HS6#TRPBF LTC6256CTS8#TRMPBF LTC6256CTS8#TRPBF LTC6256ITS8#TRMPBF LTC6256ITS8#TRPBF LTC6256HTS8#TRMPBF LTC6256HTS8#TRPBF LTC6256CKC#TRMPBF LTC6256CKC#TRPBF LTC6256IKC#TRMPBF LTC6256CMS8#PBF LTC6256IMS8#PBF LTC6256CMS#PBF LTC6256IMS#PBF LTC6257CMS#PBF LTC6257IMS#PBF LTC6257HMS#PBF LTC6256IKC#TRPBF LTC6256IMS8#TRPBF LTC6256CMS#TRPBF LTC6256IMS#TRPBF LTC6257CMS#TRPBF LTC6257IMS#TRPBF LTC6257HMS#TRPBF
8-Lead(2mmx2mm)PlasticUTDFN 0Cto70C 8-Lead(2mmx2mm)PlasticUTDFN -40Cto85C 8-LeadPlasticMSOP 8-LeadPlasticMSOP 10-LeadPlasticMSOP 10-LeadPlasticMSOP 16-LeadPlasticMSOP 16-LeadPlasticMSOP 16-LeadPlasticMSOP 0Cto70C -40Cto85C 0Cto70C -40Cto85C 0Cto70C -40Cto85C -40Cto125C
LTC6256CMS8#TRPBF LTDXW
ConsultLTCMarketingforpartsspecifiedwithwideroperatingtemperatureranges.*Thetemperaturegradeisidentifiedbyalabelontheshippingcontainer. ConsultLTCMarketingforinformationonnon-standardleadbasedfinishparts. Formoreinformationonleadfreepartmarking,goto:http://www.linear.com/leadfree/ Formoreinformationontapeandreelspecifications,goto:http://www.linear.com/tapeandreel/
5V electricAl chArActeristics
SYMBOL PARAMETER VOS InputOffsetVoltage
Theldenotesthespecificationswhichapplyoverthefulloperating temperaturerange,otherwisespecificationsareatTA=25C.VSUPPLY=5V,VCM=VOUT=VSUPPLY/2,CL=10pF SHDNisunconnected. ,V
CONDITIONS VCM=V-+2.5V(PNPRegion)
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MIN -350 -700 -350 -700 -35 -60 -35 -60 -15 -30 -15 -30
TYP 100 100 1.5 -5 5 2 2 20 2.5 380 850 1 10 0.4 0.3
MAX 350 700 350 700 35 60 35 60 15 30 15 30
UNITS V V V V V/C nA nA nA nA nA nA nA nA nV/Hz VP-P fA/Hz fA/Hz M M pF pF
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VCM=V+-0.3V(NPNRegion)
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VOSTC IB
InputOffsetVoltageDrift InputBiasCurrent(Note7)
VCM=V-+2.5V,V+-0.3V VCM=V-+2.5V
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VCM=V+-0.3V
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IOS
InputOffsetCurrent
VCM=V-+2.5V
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VCM=V+-0.3V
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en in RIN CIN
InputVoltageNoiseDensity InputNoiseVoltage InputCurrentNoiseDensity InputResistance InputCapacitance
f=1kHz f=0.1Hzto10Hz f=1kHz,VCM=0Vto4V(PNPInput) f=1kHz,VCM=4Vto5V(NPNInput) Differential CommonMode Differential CommonMode
LTC6255/LTC6256/LTC6257 5V electricAl chArActeristics
SYMBOL PARAMETER CMRR IVR PSRR AV CommonModeRejectionRatio InputVoltageRange PowerSupplyRejectionRatio LargeSignalGain VCM=0.4V,VSRangesFrom1.8Vto5V
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Theldenotesthespecificationswhichapplyoverthefulloperating temperaturerange,otherwisespecificationsareatTA=25C.VSUPPLY=5V,VCM=VOUT=VSUPPLY/2,CL=10pF SHDNisunconnected. ,V
CONDITIONS VCM=0.3Vto3.5V
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MIN 80 76 -0.1 85 81 50 28 25 8
TYP 100
MAX
UNITS dB dB
5.1 100 200 50 6 25 35 30 40 75 95 55 60 80 90 150 170
V dB dB V/mV V/mV V/mV V/mV mV mV mV mV mV mV mV mV mV mV mV mV mA mA
VO=0.5Vto4.5V,RLOAD=100k
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VO=0.5Vto4.5V,RLOAD=10k
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VOL
OutputSwingLow(InputOverdrive30mV). MeasuredfromV-
NoLoad
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ISINK=100A
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10 30
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ISINK=1mA VOH OutputSwingHigh(InputOverdrive30mV). MeasuredfromV+ NoLoad
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24 30
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ISOURCE=100A ISOURCE=1mA
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75 17 8 57 42 35 65 6
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ISC IS
OutputShort-CircuitCurrent
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SupplyCurrentperAmplifier
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73 88 7 12
A A A A nA nA
SupplyCurrentinShutdown ISHDN VIL VIH tON tOFF BW GBW tS SR FPBW THD+N ILEAK ShutdownPinCurrent SHDNInputLowVoltage SHDNInputHighVoltage Turn-OnTime Turn-OffTime -3dBClosedLoopBandwidth Gain-BandwidthProduct SettlingTime,0.5Vto4.5V,UnityGain SlewRate FullPowerBandwidth(Note8) TotalHarmonicDistortionandNoise OutputLeakageCurrentinShutdown AV=1 f=200kHz
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VSHDN=0.6V VSHDN=1.5V Disable Enable
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0.6 1.5 5 3 4.5 2.5 2 6.5 4 6
V V s s MHz MHz MHz s s V/s V/s kHz % dB
0.1% 0.01% AV=-1,VOUT=0.5Vto4.5V,CLOAD=10pF , RF=RG=10k 4VP-P f=500Hz,AV=2,RL=4k,VOUTP-P=1V VIN=2.25Vto2.75V VSHDN=0V,VOUT=0V VSHDN=0V,VOUT=5V
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1.0 0.75
1.8 140 0.0022 93
-400 -400
400 400
nA nA
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LTC6255/LTC6256/LTC6257
Theldenotesthespecificationswhichapplyoverthefull operatingtemperaturerange,otherwisespecificationsareatTA=25C.VSUPPLY=1.8V,VCM=VOUT=0.4V,CL=10pF SHDNis ,V unconnected.
SYMBOL PARAMETER VOS InputOffsetVoltage CONDITIONS VCM=V-+0.3V
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1.8V electricAl chArActeristics
MIN -350 -700 -350 -700 -35 -60 -35 -60 -15 -30 -15 -30
TYP 100 100 1.5 -8 5 2 2 21 2.5 580 870 1 10 0.4 0.3
MAX 350 700 350 700 35 60 35 60 15 30 15 30
UNITS V V V V V/C nA nA nA nA nA nA nA nA nV/Hz VP-P fA/Hz fA/Hz M M pF pF dB dB
VCM=V+-0.3V
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VOSTC IB
InputOffsetVoltageDrift InputBiasCurrent(Note7)
VCM=V-+0.3V,V+-0.3V VCM=V-+0.3V
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VCM=V+-0.3V
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IOS
InputOffsetCurrent
VCM=V-+0.3V
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VCM=V+-0.3V
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en in RIN CIN CMRR IVR PSRR AV
InputVoltageNoiseDensity InputNoiseVoltage InputCurrentNoiseDensity InputResistance InputCapacitance CommonModeRejectionRatio InputVoltageRange PowerSupplyRejectionRatio LargeSignalGain
f=1kHz,VCM=0.4V f=0.1Hzto10Hz f=1kHz,VCM=0Vto0.8V(PNPInput) f=1kHz,VCM=1Vto1.8V(NPNInput) Differential CommonMode Differential CommonMode VCM=0.2Vto1.6V
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74 67 -0.1 85 81 30 17 15 5
90 1.9 100 110 50 6 35 40 40 45 75 90
V dB dB V/mV V/mV V/mV V/mV mV mV mV mV mV mV
VCM=0.4V,VSRangesFrom1.8Vto5V
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VO=0.5Vto1.3V,RLOAD=100k
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VO=0.5Vto1.3V,RLOAD=10k
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VOL
OutputSwingLow(InputOverdrive30mV), MeasuredfromV-
NoLoad
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ISINK=100A
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10 30
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ISINK=1mA
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LTC6255/LTC6256/LTC6257
Theldenotesthespecificationswhichapplyoverthefull operatingtemperaturerange,otherwisespecificationsareatTA=25C.VSUPPLY=1.8V,VCM=VOUT=0.4V,CL=10pF SHDNis ,V unconnected.
SYMBOL PARAMETER VOH OutputSwingHigh(InputOverdrive30mV), MeasuredfromV+ CONDITIONS NoLoad
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1.8V electricAl chArActeristics
MIN
TYP 24 30
MAX 55 60 65 75 135 150
UNITS mV mV mV mV mV mV mA mA
ISOURCE=100A
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ISOURCE=1mA
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75 12.5 3.5 53 35 17 60 1.4
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ISC IS
OutputShort-CircuitCurrent
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SupplyCurrentperAmplifier
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68 83 2.0 3.0
A A A A nA nA
SupplyCurrentinShutdown ISHDN VIL VIH tON tOFF BW GBW TS SR FPBW THD+N ShutdownPinCurrent SHDNInputLowVoltage SHDNInputHighVoltage Turn-OnTime Turn-OffTime -3dBClosedLoopBandwidth Gain-BandwidthProduct SettlingTime,0.3Vto1.5V,UnityGain SlewRate FullPowerBandwidth(Note8) TotalHarmonicDistortionandNoise AV=1 f=200kHz
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VSHDN=0.5V VSHDN=1.3V Disable Enable
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-480 -350 -160 -40 0.5 1.3 5 3 4 2.4 1.8 6 4 6
V V s s MHz MHz MHz s s V/s V/s kHz % dB
0.1% 0.01% AV=-1,VOUT=0.3Vto1.5V,CLOAD=10pF
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0.9 0.75
1.5 400 0.006 84
1.2VP-P f=500Hz,AV=2,RL=4k,VOUTP-P=1V VIN=0.25Vto0.75V
Note1:StressesbeyondthoselistedunderAbsoluteMaximumRatings maycausepermanentdamagetothedevice.ExposuretoanyAbsolute MaximumRatingconditionforextendedperiodsmayaffectdevice reliabilityandlifetime. Note2:Theinputsareprotectedbyback-to-backdiodesaswellasESD protectiondiodestoeachpowersupply.Ifthedifferentialinputvoltage exceeds3.6Vortheinputextendsmorethan500mVbeyondthepower supply,theinputcurrentshouldbelimitedtolessthan10mA. Note3:Aheatsinkmayberequiredtokeepthejunctiontemperature belowtheabsolutemaximumratingwhentheoutputisshorted indefinitely. Note4:TheLTC6255C/LTC6256C/LTC6257CandLTC6255I/LTC6256I/ LTC6257Iareguaranteedfunctionaloverthetemperaturerangeof -40Cto85C.TheLTC6255H/LTC6256H/LTC6257Hareguaranteed functionaloverthetemperaturerangeof-40Cto125C.
Note5:TheLTC6255C/LTC6256C/LTC6257Careguaranteedtomeet thespecifiedperformancefrom0Cto70C.TheLTC6255C/LTC6256C/ LTC6257Caredesigned,characterizedandexpectedtomeetspecified performancefrom-40Cto85CbutarenottestedorQAsampledat thesetemperatures.TheLTC6255I/LTC6256I/LTC6257Iareguaranteed tomeetspecifiedperformancefrom-40Cto85C.TheLTC6255H/ LTC6256H/LTC6257Hareguaranteedtomeetspecifiedperformance from-40Cto125C. Note6:ThermalresistancevarieswiththeamountofPCboardmetal connectedtothepackage.Thespecifiedvaluesareforshorttraces connectedtotheleads. Note7:Theinputbiascurrentistheaverageofthecurrentsthroughthe positiveandnegativeinputpins. Note8:FullpowerbandwidthiscalculatedfromtheslewrateFPBW= SR/*VP-P.
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LTC6255/LTC6256/LTC6257 typicAl perForMAnce chArActeristics
250
InputVOSHistogram
VS = 2.5V VCM = 0V
140 120 NUMBER OF UNITS 100
InputVOSHistogram
VS = 2.5V VCM = 2.2V
200 NUMBER OF UNITS
100
60 40 20
50
0 -1000
-500
0 VOS (V)
500
1000
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0 -1000
-600
-200 200 VOS (V)
600
1000
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VOS (V)
150
80
300 VS = 2.5V 250 VCM = 0V 200 150 100 50 0 -50 -100 -150 -200 -250 -300 -350 -400 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
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VOSvsTemperature
20 18 16 14 VOS (V) 12 10 8 6 4 2
VOSTC(-40Cto125C)
H-GRADE INDUSTRIAL COMMERCIAL VS = 2.5V VCM = 0V VOS (V)
500 400 300 200
VOSvsSupplyVoltage(25C)
VCM = 0.4V
VOSvsCommonMode Voltage
500 400 300 200 VOS (V) 100 0 -100 -200 -300 -400 VS = 5V, 0V
100 0 -100 -200 -300 -400
0 -3.5
-2.5
-1.5 -0.5 0 0.5 DISTRIBUTION (V/C)
1.5
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-500 1.8
2.3
2.8 3.3 3.8 4.3 SUPPLY VOLTAGE (V)
4.8
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-500
0
1
2 VCM (V)
3
4
5
625567 G06
25
VOSvsIOUT
InputBiasCurrentvsCommon ModeVoltage
100 80 INPUT BIAS CURRENT (nA) 60 40 20 0 -20 -40 -60 -80 +IN -IN VS = 5V, 0V INPUT BIAS CURRENT (nA) 100 80 60 40 20 0 -20 -40 -60 -80 0 1 2 VCM (V) 3 4 5
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InputBiasCurrentvsCommon ModeVoltage
VS = 1.8V, 0V
VS = 2.5V 20 VCM = 0V 15 10 VOS (mV) 5 0 -5 -10 -15 -20 -25 -5 -4 -3 -2 -1 0 1 IOUT (mA) 2 3 4 5 -55C, 25C 125C
+IN -IN
-100
-100
0
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0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 VCM (V)
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LTC6255/LTC6256/LTC6257 typicAl perForMAnce chArActeristics
InputBiasCurrentvs SupplyVoltage
25 20 INPUT BIAS CURRENT (nA) 15 10 5 0 -5 -10 -15 -20 -25 1.8 2.8 3.8 SUPPLY VOLTAGE (V) 4.8
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InputBiasCurrentvsTemperature
50 40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 -40 10 60 TEMPERATURE (C) 110
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SupplyCurrentvsSupplyVoltage perChannel,-40C,25C,125C
100 VCM = 0.4V 125C 25C -40C 40
VCM = 0.4V
VS = 2.5V VCM = 2V SUPPLY CURRENT (A)
80
60
+IN -IN
VCM = -2V
20
0
0
1
2 3 SUPPLY VOLTAGE (V)
4
5
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SupplyCurrentvsTemperature
100 SATURATION VOLTAGE FROM TOP RAIL (V) VCM = 0.4V VS = 5V, 0V 0 -0.05 -0.10 -0.15 -0.20 -0.25 -0.30 -0.35
OutputSaturationVoltagevs LoadCurrent(OutputHigh)
SATURATION VOLTAGE FROM BOTTOM RAIL (V) 125C, VS = 1.8V 85C, VS = 1.8V 25C, VS = 1.8V -40C, VS = 1.8V 0.5
OutputSaturationVoltagevs LoadCurrent(OutputLow)
125C, VS = 1.8V 125C, VS = 5V 85C, VS = 1.8V 85C, VS = 5V 25C, VS = 1.8V 25C, VS = 5V -40C, VS = 1.8V -40C, VS = 5V
80 SUPPLY CURRENT (A)
0.4
60
VS = 1.8V, 0V
0.3
40
0.2
20
0 -40
125C, VS = 5V 85C, VS = 5V 25C, VS = 5V -40C, VS = 5V 0 1 2 3 LOAD CURRENT (mA) 4 5
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0.1
-15
10 35 60 85 TEMPERATURE (C)
110
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0
0
1
2 3 LOAD CURRENT (mA)
4
5
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OutputShort-CircuitCurrentvs SupplyVoltage(Sourcing)
100 MAXIMUM SOURCING CURRENT (mA) 90 80 70 60 50 40 30 20 10 0 1.8 2.3 2.8 3.3 3.8 4.3 SUPPLY VOLTAGE (V) 4.8
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OutputShort-CircuitCurrentvs SupplyVoltage(Sinking)
100 MAXIMUM SINKING CURRENT (mA) 90 80 -40C NOISE VOLTAGE (V) 70 60 50 40 30 20 10 0 1.8 2.3 125C 2.8 3.3 3.8 4.3 SUPPLY VOLTAGE (V) 4.8
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0.1Hzto10HzOutput VoltageNoise
5 VS = 2.5V 4 VCM = 0V AV = 1 3 2 1 0 -1 -2 -3 -4 -5 0 2 4 6 TIME (s) 8 10
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VCM = 0.4V
VCM = 0.4V
125C -40C 25C
25C
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LTC6255/LTC6256/LTC6257 typicAl perForMAnce chArActeristics
INPUT REFERRED NOISE VOLTAGE DENSITY (nV/Hz) 300 250 200 150 100 50 0 INPUT REFERRED NOISE VOLTAGE DENSITY (nV/Hz)
NoiseVoltageDensityvs Frequency
VS = 2.5V VCM = 0V
WideBandNoiseVoltageDensity vsFrequency
INPUT REFERRED NOISE CURRENT (pA/Hz) 80 VS = 2.5V 70 VCM = 0V 60 50 40 30 20 10 0 0 2M 4M FREQUENCY (Hz) 6M
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InputNoiseCurrentvsFrequency
25 VS = 2.5V VCM = 0V
20
15
10
5
1
10
100 1k FREQUENCY (Hz)
10k
100k
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0
1
10
100 1k FREQUENCY (Hz)
10k
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TotalHarmonicDistortion andNoise
1 VS = 0.9V VCM = 0V AV = 2 RG = RF = 10k THD+N (%) 1
TotalHarmonicDistortion andNoise
VS = 2.5V VCM = 0V AV = 2 RF = RG = 10k AMPLITUDE (dB) 80 70 60 50 40 30 20 10 0 -10
GainandPhasevsFrequency
VS = 2.5V VCM = 0V -60 -70 -80 PHASE -90 -100 -110 MAGNITUDE -120 -130 -140 -150 100k 1M FREQUENCY (Hz) -160 10M
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0.1 THD+N (%)
0.1
PHASE
0.01
1kHz 500Hz
0.01 1kHz 0.001 0.01 500Hz 0.1 VOUTP-P (V) 1
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0.001 0.01
0.1 VOUTP-P (V)
1
10
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-20 10k
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LTC6255/LTC6256/LTC6257 typicAl perForMAnce chArActeristics
SlewRatevsSupplyVoltage
2.5 150
CommonModeRejectionRatio vsFrequency
VS = 2.5V VCM = 0V 150
PowerSupplyRejectionRatio vsFrequency
V+, VS = 1.8V, 0V V+, VS = 5V, 0V V-, VS = 1.8V, 0V V-, VS = 5V, 0V
2.0 SLEW RATE (V/s) RISING CMMR (dB) 1.5 FALLING 100 PSSR (dB) 50 V - = 0V 0.5 S VSTEP = VS+ - 1V AV = 1 RF = RG = 10k 0 1.5 2.5 3.5 4.5 VS+, SUPPLY VOLTAGE (V) 50 0 1k 10k 100k 1M FREQUENCY (Hz) 10M
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100
1.0
5.5
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0 0.001 0.01
0.1 1 10 100 FREQUENCY (Hz)
1k
10k
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CapacitiveLoadHandling OvershootvsCapacitiveLoad
16 VS = 2.5V 14 VCM = 0V AV = 1 V = 2V 12 IN OVERSHOOT (%) VOLTAGE (V) 10 8 6 4 2 0 0.01 0.1 1 CLOAD (nF) 10 100
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Large-SignalResponse
2.5 2.0 1.5 1.0 0.5 0 -0.5 -10 -1.5 -2.0 -2.5 0 20 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF 40 60 TIME (ms) 80 100
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Large-SignalResponse
0.9 0.6 0.3 0 -0.3 -0.6 -0.9 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF 0 20 60 40 TIME (s) 80 100
625567 G30
VS = 2.5V AV = 1 RLOAD = 10k VOLTAGE (V)
VS = 0.9V AV = 1 RLOAD = 10k
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0
LTC6255/LTC6256/LTC6257 typicAl perForMAnce chArActeristics
Small-SignalResponse
0.05 0.04 0.03 0.02 VOLTAGE (V) 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 0 20 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF 40 60 TIME (s) 80 100
625567 G31
Large-SignalResponse
2.5 2.0 1.5 1.0 VOLTAGE (V) 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 20 40 60 TIME (s) 80 100
625567 G33
Small-SignalResponse
0.05 0.04 VS = 2.5V AV = 1 CLOAD = 100nF
VS = 0.9V AV = 1 RLOAD = 10k
VOLTAGE (V)
VS = 2.5V AV = 1 CLOAD = 100nF
0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 0 200 400 600 TIME (s)
800
1000
625567 G34
OutputImpedancevsFrequency
1000 VS = 2.5V VCM = 0V SUPPLY CURRENT (A) 80
SupplyCurrentvsSHDNPin Voltage
VS = 1.8V, 0V 70 VCM = 0.4V 60 50 40 30 20 10 90 125C -40C 25C SUPPLY CURRENT (A)
SupplyCurrentvsSHDNPin Voltage
VS = 5V, 0V 80 VCM = 0.4V 70 60 50 40 30 20 10 -40C 25C 125C
OUTPUT IMPEDANCE ( )
100 AV = 10
10
1 AV = 1 0.1
0.01 0.01
0.1
1 10 100 FREQUENCY (Hz)
1k
10k
0
0
625567 G12
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 VSHDN (V)
625567 G35
0
0
0.2
0.4
0.6 0.8 1.0 VSHDN (V)
1.2
1.4
1.6
625567 G36
625567f
LTC6255/LTC6256/LTC6257 pin Functions
-IN:InvertingInputoftheAmplifier.Voltagerangeofthis pincangofromV--0.1VtoV++0.1V. +IN: Non-Inverting Input of Amplifier. This pin has the samevoltagerangeas-IN. V+:PositivePowerSupply.Typicallythevoltageisfrom 1.8Vto5.25V.Splitsuppliesarepossibleaslongasthe voltagebetweenV+andV-isbetween1.8Vand5.25V.A bypasscapacitorof0.1Fasclosetothepartaspossible shouldbeusedbetweenpowersupplypinsorbetween supplypinsandground. V-:NegativePowerSupply.Itisnormallytiedtoground. Itcanalsobetiedtoavoltageotherthangroundaslong asthevoltagebetweenV+andV-isfrom1.8Vto5.25V. Ifitisnotconnectedtoground,bypassitwithacapacitor of0.1Fasclosetothepartaspossible. SHDN:ActiveLowShutdown.Shutdownthresholdis0.6V abovenegativerail.Ifleftunconnected,theamplifierwill beon. OUT:AmplifierOutput.Thevoltagerangeextendstowithin millivoltsofeachsupplyrail.
siMpliFieD scheMAtic
V+ R6 5M R3 R4 R5
+
V+ I2 +IN ESDD1
V- ESDD2 D6 D5 ESDD4 ESDD3 V+ D8 D7 Q4 Q3 Q5
Q15
+
C2 I1 Q11 Q12 Q13
ESDD5
SHDN
LOGIC -IN
VBIAS Q1 Q2 Q10 Q9 Q8 CC
+
V-
I3
OUT
V
-
BUFFER AND OUTPUT BIAS
ESDD6
Q16 Q17 Q18 Q19 Q7 Q6 R1 R2
C1 Q14
V-
625567 F01
Figure1.LTC6255/LTC6256/LTC6257SimplifiedSchematic
625567f
LTC6255/LTC6256/LTC6257 operAtion
TheLTC6255familyinputsignalrangeextendsbeyond thenegativeandpositivepowersupplies.Theoutputcan evenextendallthewaytothenegativesupplywiththe properexternalpull-downcurrentsource.Figure1depicts aSimplifiedSchematicoftheamplifier.Theinputstage iscomprisedoftwodifferentialamplifiers,aPNPstage Q1/Q2andNPNstageQ3/Q4thatareactiveoverdifferent rangesofcommonmodeinputvoltage.ThePNPstage isactivebetweenthenegativepowersupplytoapproximately1Vbelowthepositivesupply.Astheinputvoltage approachesthepositivesupply,transistorQ5willsteerthe tailcurrentI1tothecurrentmirrorQ6/Q7,activatingthe NPNdifferentialpairandthePNPpairbecomesinactive fortheremaininginputcommonmoderange.Alsoforthe inputstage,devicesQ17,Q18andQ19acttocancelthe biascurrentofthePNPinputpair.WhenQ1/Q2isactive, the current in Q16 is controlled to be the same as the currentQ1/Q2.Thus,thebasecurrentofQ16isnormally equaltothebasecurrentoftheinputdevicesofQ1/Q2. Similarcircuitry(notshown)isusedtocancelthebase currentofQ3/Q4.Thebufferandoutputbiasstageuses aspecialcompensationtechniquetotakefulladvantage oftheprocesstechnologytodrivehighcapacitiveloads. ThecommonemittertopologyofQ14/Q15enablesthe outputtoswingfromrailtorail.
ApplicAtions inForMAtion
LowSupplyVoltageandLowPowerConsumption TheLTC6255familyofoperationalamplifierscanoperate withpowersupplyvoltagesfrom1.8Vto5.25V.Eachamplifierdrawsonly65A.Thelowsupplyvoltagecapabilityand lowsupplycurrentareidealforportableapplications. HighCapacitiveLoadDrivingCapabilityandWide Bandwidth The LTC6255 family is optimized for wide bandwidth low power applications. They have an extremely high gain-bandwidthtopowerratioandareunitygainstable. Whentheloadcapacitanceincreases,theincreasedcapacitance at the output pushed the non-dominant pole tolowerfrequencyintheopenloopfrequencyresponse, worseningthephaseandgainmargin.Theyaredesigned todirectlydriveupto100nFcapacitiveloadinunitygain configuration(seeTypicalPerformanceCharacteristics, Capacitive Load Handling). Higher gain configurations tendtohavebettercapacitivedrivecapabilitythanlower gainconfigurationsduetolowerclosedloopbandwidth andhencehigherphasemargin. LowInputReferredNoise TheLTC6255familyprovidesalowinputreferrednoise of20nV/Hzat1kHz.Thenoisedensitywillgrowslowly withthefrequencyinwidebandrange.Theaveragenoise voltagedensityover3MHzrangeislessthan24nV/Hz. TheLTC6255familyisidealforlownoiseandlowpower signalprocessingapplications. LowInputOffsetVoltage The LTC6255 family has a low offset voltage of 350V maximumwhichisessentialforprecisionapplications.The offsetvoltageistrimmedwithaproprietarytrimalgorithm toensurelowoffsetvoltageovertheentirecommonmode voltagerange. LowInputBiasCurrent TheLTC6255familyusesabiascurrentcancellationcircuit tocompensateforthebasecurrentoftheinputtransistors. Whentheinputcommonmodevoltageiswithin200mV ofeitherrail,thebiascancellationcircuitarenolongeractive.Forcommonmodevoltagesrangingfrom0.2Vabove
625567f
LTC6255/LTC6256/LTC6257 ApplicAtions inForMAtion
thenegativesupplyto0.2Vbelowthepositivesupply,the lowinputbiascurrentallowstheamplifierstobeusedin applicationswithhighresistancesources. GroundSensingandRailtoRailOutput TheLTC6255familyhasexcellentoutputdrivecapability, deliveringover10mAofoutputdrivecurrent.Theoutput stageisarail-to-railtopologythatiscapableofswingingto within30mVofeitherrail.Ifoutputswingtothenegative railisrequired,anexternalpulldownresistortoanegative supplycanbeadded.For5V/0Vopampsupplies,apull downresistorof2.1kto-2Vwillallowa`truezero'output swing.Inthiscase,theoutputcanswingallthewayto thebottomrailwhilemaintaining80dBofopenloopgain. Sincetheinputscango100mVbeyondeitherrail,theop ampcaneasilyperform`trueground'sensing. Themaximumoutputcurrentisafunctionoftotalsupply voltage.Asthesupplyvoltagetotheamplifierincreases, theoutputcurrentcapabilityalsoincreases.Attentionmust bepaidtokeepthejunctiontemperatureoftheICbelow 150Cwhentheoutputisincontinuousshort-circuit.The output of the amplifier has reverse-biased diodes connectedtoeachsupply.Theoutputshouldnotbeforced morethan0.5Vbeyondeithersupply,otherwisecurrent willflowthroughthesediodes. InputProtectionandOutputOverdrive Topreventbreakdownoftheinputtransistors,theinput stages are protected against a large differential input voltagebytwopairsofback-to-backdiodes,D5toD8.If thedifferentialinputvoltageexceeds1.4V,thecurrentin thesediodesmustbelimitedtolessthan10mA.These amplifiersarenotintendedforopenloopapplicationssuch as comparators. When the output stage is overdriven, internallimitingcircuitryisactivatedtoimproveoverdrive recovery.Insomeapplications,thiscircuitrymaydrawas muchas1mAsupplycurrent. ESD TheLTC6255familyhasreverse-biasedESDprotection diodesonallinputsandoutputasshowninFigure1. SupplyVoltageRamping Fastrampingofthesupplyvoltagecancauseacurrent glitchintheinternalESDprotectioncircuits.Dependingon thesupplyinductance,thiscouldresultinasupplyvoltage transientthatexceedsthemaximumrating.Asupplyvoltageramptimeofgreaterthan1msisrecommended. FeedbackComponents Caremustbetakentoensurethatthepoleformedbythe feedback resistors and the parasitic capacitance at the invertinginputdoesnotdegradestability.Forexample,in againof+2configurationwithgainandfeedbackresistors of10k,apoorlydesignedcircuitboardlayoutwithparasitic capacitance of 5pF (part +PC board) at the amplifier's invertinginputwillcausetheamplifiertooscillatedueto apoleformedat3.2MHz.Anadditionalcapacitorof5pF across the feedback resistor as shown in Figure 2 will eliminateanyringingoroscillation. Shutdown ThesingleanddualversionshaveSHDNpinsthatcan shutdowntheamplifiertolessthan7Asupplycurrent. TheSHDNpinvoltageneedstobewithin0.6VofV-for theamplifiertoshutdown.Duringshutdown,theoutput willbeinhighoutputresistancestate,whichissuitable formultiplexerapplications.Whenleftfloating,theSHDN pinisinternallypulleduptothepositivesupplyandthe amplifierremainsenabled.
5pF
10k
-
10k CPAR VIN LTC6255
+ Figure2.
VOUT
625567 F02
625567f
LTC6255/LTC6256/LTC6257 typicAl ApplicAtions
200kHz130AGain-of-100Amplifier
0.9V VIN
FrequencyResponseof40dB GainAmplifier
50 40 30
+
1/2 LTC6256
+
1/2 LTC6256 VOUT GAIN (dB)
20 10 0 -10 -20
-
-0.9V
-
90.9k
625567 F03a
10k
90.9k
10k
-30 -40 -50 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M
625567 F03b
Figure3.Gainof100Amplifier(3dBBandwidthof200kHzon130ASupplyCurrent)
LTC6255VeryLowPower2ndOrderLowpassFilter The LTC6256 circuit shown in Figure4 is a 2nd order, 100kHz,Butterworthlowpassfilter.Thefilter'sdifferential outputmaximizesthedynamicrangeinverylowvoltage operation.Ageneral2ndorderlowpasscircuitisshownin
A,1.8V,140A,100kHz,LowpassFilter (Single-EndedInputandDifferentialOutput)
1.8V 2.49k VIN 2.49k 10k 1000pF 3 1.8V 100k 100k 10F 100pF 8 1 6 0.1F
Figure5withtheequationstocalculatetheRCcomponents forcutofffrequenciesupto100kHzforaButterworthora Besselapproximation(aBessellowpassfilterhasverylow transientresponseovershoot).Inadditiontheequations fora4thorderlowpassfilterareprovidedtocalculatethe RCcomponentsfortwocascaded2ndordersections.
FrequencyResponse
VOUT
-
6 0
2.49k 2.49k GAIN (dB)
+
-
2
-6 -12 -18 -24 -30 -36
625567 F04a
1/2 LTC6256
-
1/2 LTC6256
7
5
+
VOUT+
4
-42 10k
100k FREQUENCY (Hz)
1M
625567 F04b
Figure4
625567f
LTC6255/LTC6256/LTC6257 typicAl ApplicAtions
V+ 0.1F R2 VIN R1 R3 C1 10F C2 4 6 LTC6255 5 2 SHDN 1 VOUT
Table1.
fOANDQVALUES 2ndOrderLowpass Butterworth Bessel 4thOrderLowpass Butterworth Bessel fO=f-3dB fO=f-3dB fO=1.419*f-3dB fO=1.591*f-3dB Q=0.541 Q=1.307 Q=0.522 Q=0.806 fO=f-3dB fO=1.274*f-3dB Q=0.707 Q=0.577
100k 100k
V+
Figure5
RCComponentEquations C2 1- 1- 4 Q 2 [Gain + 1] C1 R2 = 4 Q fO C2 R3 = 1 4 2 R2 C1 C2 fO2 R2 R1
Gain = R1=
R2 Gain
2 C1 > 4 Q (Gain + 1) C2
Maximumf-3dB=100kHzand Maximum Gain = 100kHz f-3dB
+
3
-
625567 F05
2sRiseTimeAnalog1APulsedLEDCurrentDriver Figure6showstheLTC6255appliedasafast,efficient analogLEDcurrentdriver.HighpowerLEDsareusedin applicationsrangingfrombrakelightstovideoprojectors. MostLEDapplicationspulsetheLEDsforthebestefficiency, andmanyapplicationstakeadvantageofcontrolofboth pulsewidthandanalogcurrentamplitude. Inordertoextendthecircuit'sinputrangetoaccommodate 5VoutputDACs,theinputvoltageisinitiallydividedby 50throughtheR1:R2divider.Thereducedstepisapplied totheLTC6255noninvertinginput,andLTC6255output rises until MOSFETs Q1 through Q3 begin to turn on, increasingthecurrentintheirdrainsandthereforethe LED.TheamountofcurrentissensedonR3,andfedback totheLTC6255invertinginputthroughR5.Theloopis compensatedbyR5andC1,withR4distancingthegate capacitance from the op amp output for the best time domainresponse.10%to90%risetimewasmeasured at2sona10mAto1Apulse.Startingat0currentthere isanadditionaldelayof2.7s. Itmayseemstrangetouseamicropoweropampinahigh currentLEDapplication,butitcanbejustifiedbythelow dutycyclesencounteredinLEDdriveapplications.Aone
625567f
LTC6255/LTC6256/LTC6257 typicAl ApplicAtions
ampLEDisquitebrightevenwhendrivenat1%oreven 0.1%dutycyclesandtheseconstitute10mAand1mA averagecurrentlevelsrespectively,inwhichcasethesupply currentoftheopampbecomesnoticeable.TheLTC6255 combines6.5MHzofgain-bandwidthproductand1.8V/s slewrateonasupplycurrentbudgetofonly65A. WhenVINisat0V,theopampsupplycurrentisnominally 65A,butthe450Vmaximuminputoffsetmayappear acrossR3inducinga4.5mAcurrentintheLED.SomeapplicationswantaguaranteedzeroLEDcurrentatVIN=0,and
2sRiseTimeAnalog1APulsedLEDCurrentDriver
R1 9.76k R2 200 5V SHDN ILED = VIN * 200mA/V ILED R4 51 Q1 Q2 Q3 Q1 TO Q3 MOSFETs 3 2N7000 5V LED OSRAM LRW5SM
thisisthepurposeofRUP.RUPforces5Areversecurrent throughR5creatinganegative1.2mVoutputoffsetatR3. ThisguaranteesazeroLEDcurrent,butnotethattheop ampsupplycurrentrisesfrom65Atoastillrespectable 650Ainthiscaseduetointernalprotectioncircuitryfor theoutputstage.Forreducedcurrent,theLTC6255can beshutdown,buttheoutputbecomeshighimpedance andmayleakhighwhichwillturnontheMOSFETsand LEDhard.Addingpull-downresistorRSDensuresthatthe LTC6255outputgoeslowwhenshuttingdown.
VIN
VIN
10mA TO 1A
5V
RUP 1M**
*RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL. *RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL. STANDBY SUPPLY CURRENT WITH VIN = 0: 65A RUP OPEN 650A RUP INSTALLED 10% TO 90% RISE TIME: 10mA TO 1A, 2s 0mA TO 1A, ADD 2.7s DELAY
Figure6:LTC6255AppliedasaLEDCurrentDriverwith2s RiseTime
-
+
LTC6255 C1 220pF
RSD 100k* R5 240
0mA TO 1A (EXTRA DELAY)
625567 F07
R3 0.1 100mW
625567 F06
Figure7:TimeDomainResponseShowing2sRiseTime. TopWaveformIsVIN.MiddleWaveformIsthe10mAto1A StepMeasuredatR3,thenthe0mAto1AStepShowing Extra2.7sDelayWhenRecoveringFrom0mA
625567f
LTC6255/LTC6256/LTC6257 pAckAge Description
(ReferenceLTCDWG#05-08-1749RevO)
1.37 0.05 0.70 0.05 2.55 0.05 0.64 0.05 1.15 0.05 2.00 0.10 R = 0.115 TYP 5 R = 0.05 TYP
KCPackage 8-LeadPlasticUTDFN(2mmx2mm)
1.37 0.10 8 0.40 0.10 PIN 1 NOTCH R = 0.20 OR 0.25 45 CHAMFER
(KC8) UTDFN 0107 REVO
2.00 0.10 PACKAGE OUTLINE 0.25 0.05 0.45 BSC 1.35 REF PIN 1 BAR TOP MARK (SEE NOTE 6)
0.64 0.10
4 0.125 REF 0.55 0.05 0.00 - 0.05
0.23 0.05 0.45 BSC 1.35 REF
1
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
BOTTOM VIEW--EXPOSED PAD
NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
625567f
LTC6255/LTC6256/LTC6257 pAckAge Description
(ReferenceLTCDWG#05-08-1636)
0.62 MAX 0.95 REF 2.90 BSC (NOTE 4)
S6Package 6-LeadPlasticTSOT-23
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.95 BSC 0.80 - 0.90
0.30 - 0.45 6 PLCS (NOTE 3)
0.20 BSC DATUM `A' 1.00 MAX
0.01 - 0.10
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
0.09 - 0.20 (NOTE 3)
1.90 BSC
S6 TSOT-23 0302 REV B
625567f
LTC6255/LTC6256/LTC6257 pAckAge Description
(ReferenceLTCDWG#05-08-1637)
0.52 MAX 0.65 REF 2.90 BSC (NOTE 4)
TS8Package 8-LeadPlasticTSOT-23
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.65 BSC 0.80 - 0.90
0.22 - 0.36 8 PLCS (NOTE 3)
0.20 BSC DATUM `A' 1.00 MAX
0.01 - 0.10
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
0.09 - 0.20 (NOTE 3)
1.95 BSC
TS8 TSOT-23 0802
625567f
0
LTC6255/LTC6256/LTC6257 pAckAge Description
(ReferenceLTCDWG#05-08-1660RevF)
3.00 0.102 (.118 .004) (NOTE 3) 0.52 (.0205) REF
MS8Package 8-LeadPlasticMSOP
0.889 (.035
0.127 .005)
8
7 65
5.23 (.206) MIN
3.20 - 3.45 (.126 - .136)
GAUGE PLANE
0.254 (.010)
DETAIL "A" 0 - 6 TYP
4.90 0.152 (.193 .006)
3.00 0.102 (.118 .004) (NOTE 4)
0.42 0.038 (.0165 .0015) TYP
0.65 (.0256) BSC
DETAIL "A"
0.53 0.152 (.021 .006) 0.18 (.007)
SEATING PLANE
1 1.10 (.043) MAX
23
4 0.86 (.034) REF
RECOMMENDED SOLDER PAD LAYOUT
0.22 - 0.38 (.009 - .015) TYP
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.65 (.0256) BSC
0.1016 (.004
0.0508 .002)
MSOP (MS8) 0307 REV F
625567f
LTC6255/LTC6256/LTC6257 pAckAge Description
(ReferenceLTCDWG#05-08-1661RevE)
0.889 0.127 (.035 .005)
MSPackage 10-LeadPlasticMSOP
5.23 (.206) MIN
3.20 - 3.45 (.126 - .136)
3.00 0.102 (.118 .004) (NOTE 3)
0.50 0.305 0.038 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT
10 9 8 7 6
0.497 0.076 (.0196 .003) REF
0.254 (.010)
GAUGE PLANE
DETAIL "A" 0 - 6 TYP
4.90 0.152 (.193 .006)
3.00 0.102 (.118 .004) (NOTE 4)
12345 0.53 0.152 (.021 .006)
DETAIL "A"
0.18 (.007)
SEATING PLANE
1.10 (.043) MAX
0.86 (.034) REF
0.50 (.0197) NOTE: BSC 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.17 - 0.27 (.007 - .011) TYP
0.1016 0.0508 (.004 .002)
MSOP (MS) 0307 REV E
625567f
LTC6255/LTC6256/LTC6257 pAckAge Description
(ReferenceLTCDWG#05-08-1669RevO)
0.889 (.035 0.127 .005)
MSPackage 16-LeadPlasticMSOP
5.23 (.206) MIN
3.20 - 3.45 (.126 - .136)
0.305 0.038 (.0120 .0015) TYP
0.50 (.0197) BSC
4.039 0.102 (.159 .004) (NOTE 3) 16151413121110 9
RECOMMENDED SOLDER PAD LAYOUT
DETAIL "A" 0 - 6 TYP
0.280 0.076 (.011 .003) REF
0.254 (.010)
GAUGE PLANE
4.90 0.152 (.193 .006)
3.00 0.102 (.118 .004) (NOTE 4)
0.53 0.152 (.021 .006)
DETAIL "A"
0.18 (.007)
SEATING PLANE
1.10 (.043) MAX
12345678
0.86 (.034) REF
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.17 - 0.27 (.007 - .011) TYP
0.50 (.0197) BSC
0.1016 (.004
0.0508 .002)
MSOP (MS16) 1107 REV O
625567f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However,noresponsibilityisassumedforitsuse.LinearTechnologyCorporationmakesnorepresentationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
LTC6255/LTC6256/LTC6257 typicAl ApplicAtion
2sRiseTimeAnalog1APulsedLEDCurrentDriver. LTC6255AppliedasaLEDCurrentDriverwith2sRiseTime
R1 9.76k R2 200 5V SHDN ILED = VIN * 200mA/V ILED R4 51 Q1 Q2 Q3 Q1 TO Q3 MOSFETs 3 2N7000 5V LED OSRAM LRW5SM
TimeDomainResponseShowing2sRiseTime.Top WaveformIsVIN.MiddleWaveformIsthe10mAto1AStep MeasuredatR3,thenthe0mAto1AStepShowingExtra 2.7sDelayWhenRecoveringFrom0mA
VIN
VIN
5V
RUP 1M**
*RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL. *RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL. STANDBY SUPPLY CURRENT WITH VIN = 0: 65A RUP OPEN 650A RUP INSTALLED 10% TO 90% RISE TIME: 10mA TO 1A, 2s 0mA TO 1A, ADD 2.7s DELAY
relAteD pArts
PARTNUMBER DESCRIPTION COMMENTS 180MHzGBW,1mA,500VVOS,RRIn/Out,2.5Vto5.25V,90V/s SlewRate 10MHzGBW,1.7mA,475VVOS,RRIn/Out,2.2Vto15V,10nFCLOAD 3.6MHzGBW,330A,70VVOS,RRIn/Out,2.7Vto5.5V,100dBCMRR 3MHzGBW,800A,3VVOS,V-toV+-1VIn,RROut,2.7Vto6V,130dB CMRR/PSRR 2.5MHzGBW,1mA,5VVOS,V-toV+-2.3VIn,RROut,4.75Vto16V, 120dBCMRR,125dBPSRR 1.5MHzGBW,110A,750VVOS,RRIn/Out,2.5Vto5.5V 1.25MHzGBW,300A,800VVOS,RRIn/Out,2.5Vto18V 1.1MHzGBW,250A,350VVOS,RRIn/Out,2.7Vto44V,110dBCMRR 500kHzGBW,150A,3VVOS,V-toV+-0.5VIn,RROut,2.7Vto6V 330kHzGBW,135A,35VVOS,V-+1.0VtoV+-1.2VIn,RROut, 2.7Vto36V LTC6246/LTC6247/ 180MHz,1A,PowerEfficientRail-to-RailOpAmps LTC6248 LT1498/LT1499 LTC6081/LT6082 10MHz,6V/s,Dual/Quad,Rail-to-RailInputandOutput, PrecisionC-LoadOpAmps PrecisionDual/QuadCMOSRail-to-RailInput/Output Amplifiers
LTC2050/LTC2051/ Zero-DriftOperationalAmplifiersinSOT-23 LTC2052 LTC1050/LTC1051/ PrecisionZero-Drift,OperationalAmplifierwithInternal LTC1052 Capacitors LTC6084/LTC6085 LT1783 LT1637/LT1638/ LT1639 LT2054/LT2055 LT6010/LT6011/ LT6012 LT1782 LT1636 LT1490A/LT1491A LT2178/LT2179 LT6000/LT6001/ LT6002 Dual/Quad1.5MHz,Rail-to-Rail,CMOSAmplifiers 1.25MHz,Over-The-Top Micropower,Rail-to-RailInput andOutputOpAmpinSOT-23
(R)
Linear Technology Corporation
(408)432-1900 FAX:(408)434-0507 www.linear.com
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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LTC6255 C1 220pF
RSD 100k* R5 240
10mA TO 1A
R3 0.1 100mW
625567 TA02a
0mA TO 1A (EXTRA DELAY)
625567 TA02b
1.1MHz,0.4V/sOver-The-TopMicropower,Rail-to-Rail InputandOutputOpAmps Single/DualMicropowerZero-DriftOperationalAmplifiers 135A,14nV/Hz,Rail-to-RailOutputPrecisionOpAmp withShutdown
Micropower,Over-The-Top,SOT-23,Rail-to-RailInputand 200kHzGBW,55A,800VVOS,RRIn/Out,2.5Vto18V OutputOpAmp Over-The-Top,MicropowerRail-to-Rail,InputandOutput 200kHzGBW,50A,225VVOS,RRIn/Out,2.7Vto44V,-40Cto125C OpAmp Dual/QuadOver-The-Top,MicropowerRail-to-RailInput andOutputOpAmps 17AMax,DualandQuad,SingleSupply,Precision OpAmps Single,DualandQuad,1.8V,13APrecisionRail-to-Rail OpAmps 200kHzGBW,50A,500VVOS,RRIn/Out,2Vto44V 85kHzGBW,17A,70VVOS,RRIn/Out,5Vto44V 50kHzGBW,16A,600VVOS(MAX),RRIn/Out,1.8Vto18V
625567f LT 0610 * PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2010

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