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LTC3868IGN-1 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3868IGN-1
Description  Low IQ, Dual 2-Phase Synchronous Step-Down Controller
Download  38 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3868IGN-1 Datasheet(HTML) 1 Page - Linear Technology

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LTC3868-1

38681fb
Typical applicaTion
FeaTures
applicaTions
DescripTion
Low IQ, Dual
2-Phase Synchronous
Step-Down Controller
High Efficiency Dual 8.5V/3.3V Step-Down Converter
n
Low Operating IQ: 170µA (One Channel On)
n
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V
n
Wide VIN Range: 4V to 24V
n
RSENSE or DCR Current Sensing
n
Out-of-PhaseControllersReduceRequiredInput
CapacitanceandPowerSupplyInducedNoise
n
OPTI-LOOP®CompensationMinimizesCOUT
n
Phase-LockableFrequency(75kHzto850kHz)
n
ProgrammableFixedFrequency(50kHzto900kHz)
n
SelectableContinuous,Pulse-Skippingor
BurstMode®OperationatLightLoads
n
VeryLowDropoutOperation:99%DutyCycle
n
AdjustableOutputVoltageSoft-Start
n
PowerGoodOutputVoltageMonitor
n
OutputOvervoltageProtection
n
OutputLatchoffProtectionDuringShortCircuit
n
LowShutdownIQ:8µA
n
InternalLDOPowersGateDrivefromVINorEXTVCC
n
NoCurrentFoldbackDuringStart-Up
n
Small4mm
×5mmQFNandNarrowSSOPPackages
n
NotebookandPalmtopComputers
n
PortableInstruments
n
BatteryOperatedDigitalDevices
n
DistributedDCPowerSystems
Efficiency and Power Loss
vs Load Current
TheLTC®3868-1isahighperformancedualstep-down
switchingregulatorcontrollerthatdrivesallN-channel
synchronouspowerMOSFETstages.Aconstantfrequency
currentmodearchitectureallowsaphase-lockablefre-
quencyofupto850kHz.Powerlossandnoiseduetothe
inputcapacitorESRareminimizedbyoperatingthetwo
controlleroutputsoutofphase.
The170μAno-loadquiescentcurrentextendsoperating
lifeinbatterypoweredsystems.OPTI-LOOPcompensa-
tionallowsthetransientresponsetobeoptimizedover
awiderangeofoutputcapacitanceandESRvalues.The
LTC3868-1featuresaprecision0.8Vreferenceandapower
goodoutputindicator.Awide4Vto24Vinputsupplyrange
encompassesawiderangeofintermediatebusvoltages
andbatterychemistries.
Independentsoft-startpinsforeachcontrollerrampthe
outputvoltagesduringstart-up.Currentfoldbacklimits
MOSFETheatdissipationduringshort-circuitconditions.
Theoutputshort-circuitlatchofffeaturefurtherprotects
thecircuitinshort-circuitconditions.
Foraleadless32-pinQFNpackagewiththeadditionalfea-
turesofadjustablecurrentlimit,clockout,phasemodula-
tionandtwoPGOODoutputs,seetheLTC3868datasheet.
0.1µF
62.5k
3.3µH
680pF
150µF
4.7µF
22µF
50V
0.007Ω
20k
15k
VOUT1
3.3V
5A
150µF
0.1µF
193k
7.2µH
680pF
0.01Ω
20k
15k
VOUT2
8.5V
3.5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1+
SENSE2+
SENSE1
SENSE2
VFB1
VFB2
ITH1
ITH2
VIN
INTVCC
SS1
SS2
VIN
9V TO 24V
38681 TA01
0.1µF
0.1µF
LTC3868-1
L
,LT,LTC,LTM,BurstMode,OPTI-LOOP,µModule,LinearTechnologyandtheLinearlogo
areregisteredtrademarksandNoRSENSEandUltraFastaretrademarksofLinearTechnology
Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S.
Patents,including5481178,5705919,5929620,6100678,6144194,6177787,6304066,6580258.
OUTPUT CURRENT (A)
0.0001
40
50
60
70
80
0.001
0.01
0.1
1
10
38681 TA01b
30
20
10
0
90
100
10
100
1000
1
0.1
10000
EFFICIENCY
POWER LOSS
VIN = 12V
VOUT = 3.3V
FIGURE 12 CIRCUIT


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