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LT3070_1 PDF预览

LT3070_1

更新时间: 2024-09-15 05:43:31
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
28页 504K
描述
5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator

LT3070_1 数据手册

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LT3070  
5A, Low Noise,  
Programmable Output,  
85mV Dropout  
Linear Regulator  
FeAtures  
Description  
TheLT®3070isalowvoltage,UltraFast™transientre-  
sponseꢀlinearꢀregulator.ꢀTheꢀdeviceꢀsuppliesꢀupꢀtoꢀ5Aꢀofꢀ  
outputcurrentwithatypicaldropoutvoltageof85mV.ꢀ  
A0.01µFreferencebypasscapacitordecreasesoutputꢀ  
n
Output Current: 5A  
n
Dropout Voltage: 85mV Typical  
n
Digitally Programmable V : 0.8V to 1.8V  
OUT  
n
Digital Output Margining: 1ꢀ, ꢁꢀ or 5ꢀ  
n
Low Output Noise: 25µV  
(10Hz to 100kHz)  
voltageꢀnoiseꢀtoꢀ25µV  
.ꢀTheꢀLT3070’sꢀhighꢀbandwidthꢀ  
RMS  
RMS  
n
n
n
n
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  
functiontocontrolabuckregulatorpoweringtheLT3070’sꢀ  
input.ꢀThisꢀtrackingꢀfunctionꢀdrivesꢀtheꢀbuckꢀregulatorꢀtoꢀ  
n
n
n
ꢀ HighꢀFrequencyꢀPSRR:ꢀ30dBꢀatꢀ1MHzꢀ  
ꢀ EnableꢀFunctionꢀTurnsꢀOutputꢀOn/Off  
ꢀ VIOCꢀPinꢀControlsꢀBuckꢀConverterꢀtoꢀMaintainꢀLowꢀ  
PowerꢀDissipationꢀandꢀOptimizeꢀEfficiency  
ꢀ PWRGD/UVLO/ThermalꢀShutdownꢀFlag  
ꢀ CurrentꢀLimitꢀwithꢀFoldbackꢀProtection  
ꢀ ThermalꢀShutdown  
n
n
n
n
maintaintheLT3070’sinputvoltagetoV ꢀ+300mV,ꢀ  
minimizingꢀpowerꢀdissipation.ꢀ  
OUT  
ꢀ 28-Leadꢀ(4mmꢀ×ꢀ5mmꢀ×ꢀ0.75mm)ꢀQFNꢀPackage  
InternalprotectionincludesUVLO,reverse-currentprotec-  
tion,ꢀprecisionꢀcurrentꢀlimitingꢀwithꢀpowerꢀfoldbackꢀandꢀ  
thermalꢀshutdown.ꢀTheꢀLT3070ꢀregulatorꢀisꢀavailableꢀinꢀaꢀ  
thermallyꢀenhancedꢀ28-lead,ꢀ4mmꢀ×ꢀ5mmꢀQFNꢀpackage.  
L,ꢀLT,LTC,ꢀLTM,ꢀLinearꢀTechnologyꢀandꢀtheꢀLinearꢀlogoꢀareꢀregisteredꢀtrademarksꢀandꢀ  
UltraFastꢀandꢀVLDOꢀareꢀtrademarksꢀofꢀLinearꢀTechnologyꢀCorporation.ꢀAllꢀotherꢀtrademarksꢀareꢀ  
theꢀpropertyꢀofꢀtheirꢀrespectiveꢀowners.ꢀPatentsꢀpending.  
ApplicAtions  
n
ꢀ FPGAꢀandꢀDSPꢀSupplies  
n
ꢀ ASICꢀandꢀMicroprocessorꢀSupplies  
n
ꢀ ServersꢀandꢀStorageꢀDevices  
n
ꢀ 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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