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参数资料
| 型号： | LTC3878EGN#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 1/26页 |
| 文件大小： | 399K |
| 代理商： | LTC3878EGN#TRPBF |
LTC3878
3878fa
Typical applicaTion
FeaTures
applicaTions
DescripTion
Fast, Wide Operating Range
No RSENSE Step-Down
DC/DC Controller
n
DistributedPowerSystems
n
EmbeddedComputing
n
CommunicationsInfrastructure
L
,LT,LTC,LTM,LinearTechnologyandtheLinearlogoareregisteredtrademarksofLinear
TechnologyCorporation.NoRSENSEisatrademarkofLinearTechnologyCorporation.
Allothertrademarksarethepropertyoftheirrespectiveowners.
ProtectedbyU.S.Patents,including5481178,6100678,6580258,5847554,6304066.
n
WideVINRange:4Vto38V
n
±1%0.8VVoltageReference
n
ExtremelyFastTransientResponse
n
tON(MIN):43ns
n
NoRSENSEValleyCurrentModeControl
n
StablewithLowESRCeramicCOUT
n
SupportsSmoothStart-UpIntoPre-BiasedOutput
n
OptimizedforHighStep-DownRatios
n
PinCompatiblewiththeLTC1778(NoEXTVCCPin)
n
PowerGoodOutputVoltageMonitor
n
DualN-ChannelMOSFETSynchronousDrive
n
AdjustableSwitchingFrequency
n
ProgrammableCurrentLimitwithFoldback
n
OutputOvervoltageProtection
n
Small16-PinNarrowSSOPPackage
The LTC3878 is a synchronous step-down switching
DC/DCcontrolleroptimizedforhighswitchingfrequency
andfasttransientresponse.Theconstanton-timevalley
currentmodearchitectureallowsforawideinputrange,
includingverylowdutyfactoroperation.Noexternalsense
resistororslopecompensationisrequired.TheLTC3878
ispincompatiblewiththeLTC1778inapplicationsthatdo
notuseEXTVCCwhileofferingbetterefficiency.Consult
withthefactorytoverifycompatibility.
Operating frequency is set by an external resistor and
compensatedforvariationsinVINtoofferexcellentline
stability. Discontinuous mode operation provides high
efficiencyduringlightloadconditions.Aforcedcontinu-
ouscontrolpinallowstheusertoreducenoiseandRF
interference.Safetyfeaturesincludeoutputovervoltage
protectionandprogrammablecurrentlimitwithfoldback.
Soft-startcapabilityforsupplysequencingisaccomplished
throughanexternaltimingcapacitor.Thecurrentlimitis
userprogrammable.
TheLTC3878allowsoperationfrom4Vto38Vattheinput
andfrom0.8Vto90%VINattheoutput.TheLTC3878is
availableinasmall16-pinnarrowSSOPpackage.
HighEfficiencyStep-DownConverter
EfficiencyvsLoadCurrent
ION
VIN
RUN/SS
ITH
SGND
PGOOD
TG
BG
PGND
VRNG
VFB
SW
BOOST
INTVCC
FCB
0.22F
0.1F
220pF
RJK0305
RJK0330
0.56H
432k
12.1k
LTC3878
3878 TA01a
5.11k
10k
VOUT
1.2V
15A
VIN
4.5V TO 28V
4.7F
330F
2
10F
LOAD CURRENT (A)
30
EFFICIENCY
(%)
90
100
20
10
80
50
70
60
40
0.01
1
10
100
3878 G07
0
0.1
CONTINUOUS
MODE
DISCONTINUOUS
MODE
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3878IGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3878IGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3879EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3879EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3879EUD#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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