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LTC3210-2 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC3210-2
Description  MAIN/CAM LED Controllers with 32-Step Brightness Control
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3210-2 Datasheet(HTML) 10 Page - Linear Technology

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LTC3210-2/LTC3210-3
0
321023fb
operaTion
Figure 2. Charge Pump Thevenin Equivalent Open-Loop Circuit
TEMPERATURE (°C)
–40
3.4
3.6
3.8
60
3.2
3.0
–15
10
35
85
321023 F03
2.8
2.6
2.4
VBAT = 3V
VCPO = 4.2V
C2 = C3 = C4 = 2.2µF
Figure 3. Typical 1.5x ROL vs Temperature
+–
ROL
CPO
1.5VBAT OR 2VBAT
+
–
321023 F02
Soft-Start
Initially,whenthepartisinshutdown,aweakswitchcon-
nectsVBATtoCPO.ThisallowsVBATtoslowlychargethe
CPOoutputcapacitortopreventlargechargingcurrents.
TheLTC3210-2/LTC3210-3alsoemployasoft-startfeature
onitschargepumptopreventexcessiveinrushcurrent
andsupplydroopwhenswitchingintothestep-upmodes.
ThecurrentavailabletotheCPOpinisincreasedlinearly
overatypicalperiodof150µs.Soft-startoccursatthe
startofboth1.5xand2xmodechanges.
Charge Pump Strength and Regulation
RegulationisachievedbysensingthevoltageattheCPO
pin and modulating the charge pump strength based
ontheerrorsignal.TheCPOregulationvoltagesareset
internally,andaredependentonthechargepumpmodes
asshowninTable1.
Table 1. Charge Pump Output Regulation Voltages
CHARGE PUMP MODE
REGULATED VCPO
1.5x
4.55V
2x
5.05V
WhentheLTC3210-2/LTC3210-3operateineither1.5x
modeor2xmode,thechargepumpcanbemodeledas
aThevenin-equivalentcircuittodeterminetheamountof
currentavailablefromtheeffectiveinputvoltageandef-
fectiveopen-loopoutputresistance,ROL(Figure2).
ROLisdependentonanumberoffactorsincludingthe
switching term, 1/(2fOSC•CFLY),internalswitchresis-
tancesandthenonoverlapperiodoftheswitchingcircuit.
However,foragivenROL,theamountofcurrentavailable
willbedirectlyproportionaltotheadvantagevoltageof
1.5VBAT–CPOfor1.5xmodeand2VBAT–CPOfor2x
mode.ConsidertheexampleofdrivingwhiteLEDsfrom
a3.1Vsupply.IftheLEDforwardvoltageis3.8Vandthe
currentsourcesrequire100mV,theadvantagevoltagefor
1.5xmodeis3.1V•1.5–3.8V–0.1Vor750mV.Notice
thatiftheinputvoltageisraisedto3.2V,theadvantage
voltagejumpsto900mV—a20%improvementinavail-
ablestrength.
From Figure 2, for 1.5x mode the available current is
givenby:
I
V
V
R
OUT
BAT
CPO
OL
=
( .
–
)
1 5
For2xmode,theavailablecurrentisgivenby:
I
V
V
R
OUT
BAT
CPO
OL
=
(
–
)
2
Noticethattheadvantagevoltageinthiscaseis3.1V•2
–3.8V–0.1V=2.3V.ROLishigherin2xmodebutasig-
nificantoverallincreaseinavailablecurrentisachieved.
TypicalvaluesofROLasafunctionoftemperatureare
showninFigure3andFigure4.
Shutdown Current
Inshutdownmodeallthecircuitryisturnedoffandthe
LTC3210-2/LTC3210-3drawaverylowcurrentfromtheVBAT
supply.Furthermore,CPOisweaklyconnectedtoVBAT.The
LTC3210-2/LTC3210-3entershutdownmodewhenboththe
ENMandENCpinsarebroughtlowat150µs(typ).ENM


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