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LTC3857IUHTRPBF PDF预览

LTC3857IUHTRPBF

更新时间: 2024-02-04 12:24:46
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
38页 524K
描述
Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3857IUHTRPBF 技术参数

是否Rohs认证: 符合生命周期:Transferred
零件包装代码:QFN包装说明:HVQCCN, LCC32,.2SQ,20
针数:32Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.17其他特性:ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 24V
模拟集成电路 - 其他类型:DUAL SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:38 V
最小输入电压:4 V标称输入电压:12 V
JESD-30 代码:S-PQCC-N32JESD-609代码:e3
长度:5 mm湿度敏感等级:1
功能数量:1端子数量:32
最高工作温度:85 °C最低工作温度:
标称输出电压:5.1 V封装主体材料:PLASTIC/EPOXY
封装代码:HVQCCN封装等效代码:LCC32,.2SQ,20
封装形状:SQUARE封装形式:CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:0.8 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:PHASE-SHIFT
最大切换频率:900 kHz技术:CMOS
温度等级:OTHER端子面层:Matte Tin (Sn)
端子形式:NO LEAD端子节距:0.5 mm
端子位置:QUAD处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:5 mmBase Number Matches:1

LTC3857IUHTRPBF 数据手册

 浏览型号LTC3857IUHTRPBF的Datasheet PDF文件第2页浏览型号LTC3857IUHTRPBF的Datasheet PDF文件第3页浏览型号LTC3857IUHTRPBF的Datasheet PDF文件第4页浏览型号LTC3857IUHTRPBF的Datasheet PDF文件第5页浏览型号LTC3857IUHTRPBF的Datasheet PDF文件第6页浏览型号LTC3857IUHTRPBF的Datasheet PDF文件第7页 
LTC3857  
Low I , Dual, 2-Phase  
Q
Synchronous Step-Down  
Controller  
FeaTures  
DescripTion  
Theꢀ LTC®3857ꢀ isꢀ aꢀ highꢀ performanceꢀ dualꢀ step-downꢀ  
switchingregulatorcontrollerthatdrivesallN-channelꢀ  
synchronouspowerMOSFETstages.Aconstantfrequencyꢀ  
currentmodearchitectureallowsaphase-lockablefre-  
quencyꢀofꢀupꢀtoꢀ850kHz.ꢀPowerꢀlossꢀandꢀnoiseꢀdueꢀtoꢀtheꢀ  
ESRoftheinputcapacitorESRareminimizedbyoperatingꢀ  
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 (40V Abs Max)  
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-loadꢀquiescentꢀcurrentꢀextendsꢀoperatingꢀrunꢀ  
timeꢀinꢀbattery-poweredꢀsystems.ꢀTheꢀLTC3857ꢀfeaturesꢀaꢀ  
precision0.8Vreferenceandpowergoodoutputindicators.Aꢀ  
wide4Vto38Vinputsupplyrangeencompassesawiderangeꢀ  
ofꢀintermediateꢀbusꢀvoltagesꢀandꢀbatteryꢀchemistries.  
n
n
n
n
n
n
n
n
n
ꢀ SelectableꢀCurrentꢀLimit  
ꢀ VeryꢀLowꢀDropoutꢀOperation:ꢀ99%ꢀDutyꢀCycle  
ꢀ AdjustableꢀOutputꢀVoltageꢀSoft-StartꢀorꢀTracking  
ꢀ PowerꢀGoodꢀOutputꢀVoltageꢀMonitors  
ꢀ OutputꢀOvervoltageꢀProtection  
IndependentꢀTRACK/SSꢀpinsꢀforꢀeachꢀcontrollerꢀrampꢀtheꢀ  
outputꢀvoltagesꢀduringꢀstart-up.ꢀCurrentꢀfoldbackꢀlimitsꢀ  
MOSFETꢀheatꢀdissipationꢀduringꢀshort-circuitꢀconditions.ꢀ  
TheꢀPLLIN/MODEꢀpinꢀselectsꢀamongꢀBurstꢀModeꢀopera-  
tion,pulse-skippingmode,orcontinuousinductorcurrentꢀ  
modeꢀatꢀlightꢀloads.ꢀ  
ꢀ LowꢀShutdownꢀI ꢀ:ꢀ<8µA  
Q
ꢀ InternalꢀLDOꢀPowersꢀGateꢀDriveꢀfromꢀV ꢀorꢀEXTV  
IN  
CC  
ꢀ NoꢀCurrentꢀFoldbackꢀDuringꢀStart-up  
ꢀ SmallꢀLowꢀProfileꢀ(0.75mm)ꢀ5mmꢀ×ꢀ5mmꢀQFNꢀPackage  
Forꢀaꢀleadedꢀ28-leadꢀSSOPꢀpackageꢀwithꢀaꢀfixedꢀcurrentꢀ  
limitꢀandꢀoneꢀPGOODꢀoutput,ꢀwithoutꢀphaseꢀmodulationꢀ  
orꢀaꢀclockꢀoutput,ꢀseeꢀtheꢀLTC3857-1ꢀdataꢀsheet.  
applicaTions  
n
ꢀ AutomotiveꢀAlways-OnꢀSystems  
L,ꢀLT,LTC,ꢀLTM,ꢀBurstꢀMode,ꢀOPTI-LOOP,ꢀPolyPhase,ꢀµModule,ꢀLinearꢀTechnologyꢀandꢀtheꢀ  
LinearꢀlogoꢀareꢀregisteredꢀtrademarksꢀandꢀNoꢀR  
ꢀandꢀUltraFastꢀareꢀtrademarksꢀofꢀLinearꢀ  
SENSE  
n
ꢀ BatteryꢀOperatedꢀDigitalꢀDevices  
TechnologyꢀCorporation.ꢀAllꢀotherꢀtrademarksꢀareꢀtheꢀpropertyꢀofꢀtheirꢀrespectiveꢀowners.ꢀ  
ProtectedꢀbyꢀU.S.ꢀPatents,ꢀincludingꢀ5481178,ꢀ5929620,ꢀ6177787,ꢀ6144194,ꢀ5408150,ꢀ  
6580258,ꢀ5705919,ꢀ6100678.  
n
ꢀ DistributedꢀDCꢀPowerꢀSystems  
Typical applicaTion  
Efficiency and Power Loss  
High Efficiency Dual 3.3V/8.5V Step-Down Converter  
V
IN  
vs Output Current  
9V TO 38V  
22µF  
50V  
100  
90  
10000  
1000  
100  
10  
4.7µF  
V
V
= 12V  
IN  
OUT  
V
INTV  
CC  
IN  
= 3.3V  
TG1  
TG2  
FIGURE 13 CIRCUIT  
80  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
3.3µH  
7.2µH  
70  
60  
50  
BG1  
BG2  
LTC3857  
PGND  
40  
30  
20  
10  
0
+
+
SENSE1  
SENSE2  
0.010Ω  
193k  
0.007Ω  
1
V
SENSE2  
OUT2  
SENSE1  
FB1  
V
OUT1  
3.3V  
5A  
8.5V  
3.5A  
V
V
I
FB2  
0.1  
62.5k  
I
0.000010.0001 0.001 0.01  
0.1  
1
10  
TH1  
TH2  
150µF  
680pF  
15k  
680pF  
15k  
150µF  
OUTPUT CURRENT (A)  
TRACK/SS1 SGND TRACK/SS2  
0.1µF  
20k  
3857 TA01b  
20k  
0.1µF  
3857 TA01  
3857fa  

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