LT3070
5A, Low Noise,
Programmable Output,
85mV Dropout
Linear Regulator
FeAtures
Description
TheꢀLT®3070ꢀisꢀaꢀlowꢀvoltage,ꢀUltraFast™ꢀtransientꢀre-
sponseꢀlinearꢀregulator.ꢀTheꢀdeviceꢀsuppliesꢀupꢀtoꢀ5Aꢀofꢀ
outputꢀcurrentꢀwithꢀaꢀtypicalꢀdropoutꢀvoltageꢀofꢀ85mV.ꢀ
Aꢀ0.01µFꢀreferenceꢀbypassꢀcapacitorꢀdecreasesꢀoutputꢀ
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ꢀ Output Current: 5A
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Dropout Voltage: 85mV Typical
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Digitally Programmable V : 0.8V to 1.8V
OUT
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Digital Output Margining: 1ꢀ, ꢁꢀ or 5ꢀ
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Low Output Noise: 25µV
(10Hz to 100kHz)
voltageꢀnoiseꢀtoꢀ25µV
.ꢀTheꢀLT3070’sꢀhighꢀbandwidthꢀ
RMS
RMS
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Parallel Multiple Devices for 10A or More
permitsꢀtheꢀuseꢀofꢀlowꢀESRꢀceramicꢀcapacitors,ꢀsavingꢀ
bulkꢀcapacitanceꢀandꢀcost.ꢀTheꢀLT3070’sꢀfeaturesꢀmakeꢀ
itꢀidealꢀforꢀhighꢀperformanceꢀFPGAs,ꢀmicroprocessorsꢀorꢀ
sensitiveꢀcommunicationꢀsupplyꢀapplications.ꢀ
Precision Current Limit: 20ꢀ
ꢀ 1ꢁꢀAccuracyꢀOverꢀLine,ꢀLoadꢀandꢀTemperature
ꢀ StableꢀwithꢀLowꢀESRꢀCeramicꢀOutputꢀCapacitorsꢀ
(15µFꢀMinimum)
Outputꢀvoltageꢀisꢀdigitallyꢀselectableꢀinꢀ50mVꢀincrementsꢀ
overꢀaꢀ0.8Vꢀtoꢀ1.8Vꢀrange.ꢀAꢀmarginingꢀfunctionꢀallowsꢀ
theꢀuserꢀtoꢀadjustꢀsystemꢀoutputꢀvoltageꢀinꢀincrementsꢀofꢀ
1ꢁ,ꢀ 3ꢁꢀorꢀ 5ꢁ.ꢀTheꢀICꢀincorporatesꢀaꢀuniqueꢀtrackingꢀ
functionꢀtoꢀcontrolꢀaꢀbuckꢀregulatorꢀpoweringꢀtheꢀLT3070’sꢀ
input.ꢀThisꢀtrackingꢀfunctionꢀdrivesꢀtheꢀbuckꢀregulatorꢀtoꢀ
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ꢀ HighꢀFrequencyꢀPSRR:ꢀ30dBꢀatꢀ1MHzꢀ
ꢀ EnableꢀFunctionꢀTurnsꢀOutputꢀOn/Off
ꢀ VIOCꢀPinꢀControlsꢀBuckꢀConverterꢀtoꢀMaintainꢀLowꢀ
PowerꢀDissipationꢀandꢀOptimizeꢀEfficiency
ꢀ PWRGD/UVLO/ThermalꢀShutdownꢀFlag
ꢀ CurrentꢀLimitꢀwithꢀFoldbackꢀProtection
ꢀ ThermalꢀShutdown
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maintainꢀtheꢀLT3070’sꢀinputꢀvoltageꢀtoꢀV ꢀ+ꢀ300mV,ꢀ
minimizingꢀpowerꢀdissipation.ꢀ
OUT
ꢀ 28-Leadꢀ(4mmꢀ×ꢀ5mmꢀ×ꢀ0.75mm)ꢀQFNꢀPackage
InternalꢀprotectionꢀincludesꢀUVLO,ꢀreverse-currentꢀprotec-
tion,ꢀprecisionꢀcurrentꢀlimitingꢀwithꢀpowerꢀfoldbackꢀandꢀ
thermalꢀshutdown.ꢀTheꢀLT3070ꢀregulatorꢀisꢀavailableꢀinꢀaꢀ
thermallyꢀenhancedꢀ28-lead,ꢀ4mmꢀ×ꢀ5mmꢀQFNꢀpackage.
L,ꢀLT,ꢀLTC,ꢀLTM,ꢀLinearꢀTechnologyꢀandꢀtheꢀLinearꢀlogoꢀareꢀregisteredꢀtrademarksꢀandꢀ
UltraFastꢀandꢀVLDOꢀareꢀtrademarksꢀofꢀLinearꢀTechnologyꢀCorporation.ꢀAllꢀotherꢀtrademarksꢀareꢀ
theꢀpropertyꢀofꢀtheirꢀrespectiveꢀowners.ꢀPatentsꢀpending.
ApplicAtions
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ꢀ FPGAꢀandꢀDSPꢀSupplies
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ꢀ ASICꢀandꢀMicroprocessorꢀSupplies
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ꢀ ServersꢀandꢀStorageꢀDevices
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ꢀ PostꢀBuckꢀRegulationꢀandꢀSupplyꢀIsolation
typicAl ApplicAtion
Dropout Voltage
0.9V, 5A Regulator
150
V
IN
= V
OUT(NOMINAL)
50k
V
BIAS
2.2V TO 3.6V
PWRGD
2.2µF
120
90
60
30
0
BIAS
V
IN
1.2V
IN
EN
V
PWRGD
SENSE
330µF
V
0.9V
5A
OUT
V
= 1.8V
= 3.3V
OUT
LT3070
OUT
O0
V
BIAS
2.2µF*
4.7µF*
10µF*
V
O1
V
O2
V
BIAS
= 0.8V
= 2.5V
OUT
V
*X5R OR X7R CAPACITORS
MARGSEL
MARGTOL
VIOC
REF/BYP
GND
1nF
0.01µF
0
1
2
3
4
5
3070 TA01a
OUTPUT CURRENT (A)
3070 TA01b
3070fa
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