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LTC3857-1 PDF预览

LTC3857-1

更新时间： 2024-01-13 09:38:24
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
38页 514K
描述
Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

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中文翻译

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LTC3857-1 数据手册

 浏览型号LTC3857-1的Datasheet PDF文件第2页浏览型号LTC3857-1的Datasheet PDF文件第3页浏览型号LTC3857-1的Datasheet PDF文件第4页浏览型号LTC3857-1的Datasheet PDF文件第5页浏览型号LTC3857-1的Datasheet PDF文件第6页浏览型号LTC3857-1的Datasheet PDF文件第7页 
LTC3857-1  
Low I , Dual, 2-Phase  
Q
Synchronous Step-Down  
Controller  
FeaTures  
DescripTion  
TheꢀLTC®3857-1ꢀisꢀaꢀhighꢀperformanceꢀdualꢀstep-downꢀ  
switchingꢀregulatorꢀcontrollerꢀthatꢀdrivesꢀallꢀN-channelꢀ  
synchronousꢀpowerꢀMOSFETꢀstages.ꢀAꢀconstantꢀfrequencyꢀ  
currentꢀmodeꢀarchitectureꢀallowsꢀaꢀphase-lockableꢀfre-  
quencyꢀofꢀupꢀtoꢀ850kHz.ꢀPowerꢀlossꢀandꢀnoiseꢀdueꢀtoꢀtheꢀ  
ESRꢀofꢀtheꢀinputꢀcapacitorꢀESRꢀareꢀminimizedꢀbyꢀoperatingꢀ  
theꢀtwoꢀcontrollerꢀoutputꢀstagesꢀoutꢀofꢀphase.  
n
ꢀ Low Operating I : 50µA (One Channel On)  
Q
n
n
n
n
ꢀ Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
ꢀ Wide V Range: 4V to 38V  
IN  
ꢀ R  
or DCR Current Sensing  
SENSE  
ꢀ Out-of-PhaseꢀControllersꢀReduceꢀRequiredꢀInputꢀ  
CapacitanceꢀandꢀPowerꢀSupplyꢀInducedꢀNoise  
®
n
n
n
n
ꢀ OPTI-LOOP ꢀCompensationꢀMinimizesꢀC  
OUT  
ꢀ Phase-LockableꢀFrequencyꢀ(75kHz-850kHz)  
ꢀ ProgrammableꢀFixedꢀFrequencyꢀ(50kHz-900kHz)  
ꢀ SelectableꢀContinuous,ꢀPulse-SkippingꢀorꢀLowꢀRippleꢀ  
BurstꢀMode®ꢀOperationꢀatꢀLightꢀLoads  
Theꢀ50μAꢀno-loadꢀquiescentꢀcurrentꢀextendsꢀoperatingꢀlifeꢀ  
inꢀbattery-poweredꢀsystems.ꢀTheꢀLTC3857-1ꢀfeaturesꢀaꢀpre-  
cisionꢀ0.8Vꢀreferenceꢀandꢀaꢀpowerꢀgoodꢀoutputꢀindicator.ꢀAꢀ  
wideꢀ4Vꢀtoꢀ38Vꢀinputꢀsupplyꢀrangeꢀencompassesꢀaꢀwideꢀrangeꢀ  
ofꢀintermediateꢀbusꢀvoltagesꢀandꢀbatteryꢀchemistries.  
n
n
n
n
n
n
n
n
ꢀ VeryꢀLowꢀDropoutꢀOperation:ꢀ99%ꢀDutyꢀCycle  
ꢀ AdjustableꢀOutputꢀVoltageꢀSoft-StartꢀorꢀTracking  
ꢀ PowerꢀGoodꢀOutputꢀVoltageꢀMonitor  
IndependentꢀTRACK/SSꢀpinsꢀforꢀeachꢀcontrollerꢀrampꢀtheꢀ  
outputꢀvoltagesꢀduringꢀstart-up.ꢀCurrentꢀfoldbackꢀlimitsꢀ  
MOSFETꢀheatꢀdissipationꢀduringꢀshort-circuitꢀconditions.ꢀ  
TheꢀPLLIN/MODEꢀpinꢀselectsꢀamongꢀBurstꢀModeꢀopera-  
tion,ꢀpulse-skippingꢀmode,ꢀorꢀcontinuousꢀinductorꢀcurrentꢀ  
modeꢀatꢀlightꢀloads.  
ꢀ OutputꢀOvervoltageꢀProtection  
ꢀ LowꢀShutdownꢀI :ꢀ<8µA  
ꢀ InternalꢀLDOꢀPowersꢀGateꢀDriveꢀfromꢀV ꢀorꢀEXTV  
ꢀ NoꢀCurrentꢀFoldbackꢀDuringꢀStart-Up  
ꢀ NarrowꢀSSOPꢀPackage  
Q
IN  
CC  
Forꢀaꢀleadlessꢀ32-pinꢀQFNꢀpackageꢀwithꢀtheꢀadditionalꢀfea-  
turesꢀofꢀadjustableꢀcurrentꢀlimit,ꢀclockꢀout,ꢀphaseꢀmodula-  
tionꢀandꢀtwoꢀPGOODꢀoutputs,ꢀseeꢀtheꢀLTC3857ꢀdataꢀsheet.  
L,ꢀLT,ꢀLTC,ꢀLTM,ꢀBurstꢀMode,ꢀOPTI-LOOP,ꢀµModule,ꢀLinearꢀTechnologyꢀandꢀtheꢀLinearꢀlogoꢀ  
applicaTions  
n
ꢀ AutomotiveꢀAlways-OnꢀSystems  
ꢀ BatteryꢀOperatedꢀDigitalꢀDevices  
n
areꢀregisteredꢀtrademarksꢀandꢀNoꢀR  
ꢀandꢀUltraFastꢀareꢀtrademarksꢀofꢀLinearꢀTechnologyꢀ  
SENSE  
n
ꢀ DistributedꢀDCꢀPowerꢀSystems  
Corporation.ꢀAllꢀotherꢀtrademarksꢀareꢀtheꢀpropertyꢀofꢀtheirꢀrespectiveꢀowners.ꢀProtectedꢀbyꢀ  
U.S.ꢀPatents,ꢀincludingꢀ5481178,ꢀ5929620,ꢀ6177787,ꢀ6144194,ꢀ5408150,ꢀ6580258,ꢀ5705919,ꢀ  
6100678.  
Typical applicaTion  
High Efficiency Dual 3.3V/8.5V Step-Down Converter  
V
Efficiency and Power Loss  
IN  
9V TO 38V  
22µF  
50V  
vs Output Current  
1µF  
100  
90  
10000  
1000  
100  
10  
V
INTV  
CC  
IN  
V
V
= 12V  
IN  
OUT  
TG1  
TG2  
= 3.3V  
0.1µF  
0.1µF  
FIGURE 13 CIRCUIT  
BOOST1  
SW1  
BOOST2  
SW2  
80  
3.3µH  
7.2µH  
70  
BG1  
BG2  
60  
50  
LTC3857-1  
PGND  
+
+
40  
30  
20  
10  
0
SENSE1  
SENSE2  
0.010Ω  
193k  
0.007Ω  
1
–
–
V
8.5V  
3.5A  
SENSE2  
OUT2  
SENSE1  
V
OUT1  
3.3V  
5A  
V
FB1  
V
FB2  
62.5k  
I
I
TH2  
TH1  
TRACK/SS1 SGND TRACK/SS2  
0.1µF  
0.1  
150µF  
680pF  
15k  
680pF  
150µF  
0.000010.0001 0.001 0.01  
0.1  
1
10  
20k  
OUTPUT CURRENT (A)  
20k  
15k  
0.1µF  
3857 TA01b  
38571 TA01  
38571fa  
ꢀ
1234567...38

中文翻译

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