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參數(shù)資料
| 型號(hào)： | LTC4011CFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件頁(yè)數(shù)： | 10/26頁(yè) |
| 文件大小： | 653K |
| 代理商： | LTC4011CFE#TRPBF |
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LTC4011
4011fb
applicaTions inForMaTion
operations.However,thispracticeisnotrecommended
forNiMHcellschargedwellaboveorbelowtheir1Crate,
becausefastchargeterminationbasedsolelyonvoltage
inflectionmaynotbeadequatetoprotectthebatteryfrom
asevereovercharge.Aresistorbetween10kand20kmay
beusedtoconnectVTEMPtoVRTifthepausefunctionis
stilldesired.
INTVDDRegulatorOutput
IfBGATEisleftopen,theINTVDDpinoftheLTC4011can
beusedasanadditionalsourceofregulatedvoltageinthe
hostsystemanytimeREADYisactive.Switchingloads
onINTVDDmayreducetheaccuracyofinternalanalog
circuits used to monitor and terminate fast charging.
Inaddition,DCcurrentdrawnfromtheINTVDDpincan
greatlyincreaseinternalpowerdissipationatelevatedVCC
voltages.Aminimumceramicbypasscapacitorof0.1F
isrecommended.
CalculatingAveragePowerDissipation
TheusershouldensurethatthemaximumratedICjunction
temperatureisnotexceededunderalloperatingconditions.
The thermal resistance of the LTC4011 package (
θJA)
is38°C/W,providedtheexposedmetalpadisproperly
solderedtothePCB.Theactualthermalresistanceinthe
applicationwilldependontheamountofPCBcopperto
whichthepackageissoldered.Feedthroughviasdirectly
belowthepackagethatconnecttoinnercopperlayers
arehelpfulinloweringthermalresistance.Thefollowing
formulamaybeusedtoestimatethemaximumaverage
power dissipation PD(inwatts)oftheLTC4011under
normaloperatingconditions.
where:
IDD=AverageexternalINTVDDloadcurrent,ifany
IVRT=Loadcurrentdrawnbytheexternalthermistor
networkfromVRT,ifany
QTGATE=GatechargeofexternalP-channelMOSFET
incoulombs
QBGATE=GatechargeofexternalN-channelMOSFET
(ifused)incoulombs
VLED=MaximumexternalLEDforwardvoltage
RLED=ExternalLEDcurrent-limitingresistorusedin
theapplication
n=NumberofLEDsdrivenbytheLTC4011
SampleApplications
Figures6through9detailsamplechargerapplications
ofvariouscomplexities.CombinedwiththeTypicalAp-
plicationonthefirstpageofthisdatasheet,theseFigures
demonstrate some of the proper configurations of the
LTC4011.MOSFETbodydiodesareshowninthesefigures
strictlyforreferenceonly.
Figure6showsaminimumapplication,whichmightbe
encounteredinlowcostNiCdfastchargeapplications.
FET-basedPowerPathcontrolallowsformaximuminput
voltagerangefromtheDCadapter.TheLTC4011uses
–V to terminate the fast charge state, as no external
temperature information is available. Nonsynchronous
PWMswitchingisemployedtoreduceexternalcomponent
cost.AsingleLEDindicateschargingstatus.
A3ANiMHapplicationofmediumcomplexityisshownin
Figure7.PowerPathcontrolthatiscompletelyFET-based
allowsforbothminimuminputvoltageoverheadandmini-
mumswitchoverlosswhenoperatingfromthebattery.
P-channelMOSFETQ4functionsasaswitchtoconnectthe
batterytothesystemloadwhenevertheDCinputadapter
isremoved.Ifthemaximumbatteryvoltageislessthan
themaximumratedVGSofQ4,diodeD1andresistorR5
are not required. Otherwise choose the Zener voltage
ofD1tobelessthanthemaximumratedVGSofQ4.R5
providesabiascurrentof(VBAT–VZENER)/(R5+20k)for
D1whentheinputadapterisremoved.ChooseR5tomake
thiscurrent,whichisdrawnfromthebattery,justlarge
enoughtodevelopthedesiredVGSacrossD1.
Precharge,fastchargeandtop-offstatesareindicatedby
externalLEDs.TheVTEMPthermistornetworkallowsthe
LTC4011toaccuratelyterminatefastchargeunderavariety
ofappliedchargerates.UseofasynchronousPWMtopol-
ogyimprovesefficiencyandlowerspowerdissipation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4011EFE | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4012 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
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