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LTC3857IGN-1PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3857IGN-1PBF
Description  Low IQ, Dual, 2-Phase Synchronous Step-Down Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3857IGN-1PBF Datasheet(HTML) 1 Page - Linear Technology

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LTC3857-1

38571fa
Typical applicaTion
FeaTures
applicaTions
DescripTion
Low IQ, Dual, 2-Phase
Synchronous Step-Down
Controller
High Efficiency Dual 3.3V/8.5V Step-Down Converter
n
Low Operating IQ: 50µA (One Channel On)
n
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n
Wide VIN Range: 4V to 38V
n
RSENSE or DCR Current Sensing
n
Out-of-PhaseControllersReduceRequiredInput
CapacitanceandPowerSupplyInducedNoise
n
OPTI-LOOP®CompensationMinimizesCOUT
n
Phase-LockableFrequency(75kHz-850kHz)
n
ProgrammableFixedFrequency(50kHz-900kHz)
n
SelectableContinuous,Pulse-SkippingorLowRipple
BurstMode®OperationatLightLoads
n
VeryLowDropoutOperation:99%DutyCycle
n
AdjustableOutputVoltageSoft-StartorTracking
n
PowerGoodOutputVoltageMonitor
n
OutputOvervoltageProtection
n
LowShutdownIQ:<8µA
n
InternalLDOPowersGateDrivefromVINorEXTVCC
n
NoCurrentFoldbackDuringStart-Up
n
NarrowSSOPPackage
n
AutomotiveAlways-OnSystems
n
BatteryOperatedDigitalDevices
n
DistributedDCPowerSystems
0.1µF
62.5k
3.3µH
680pF
150µF
1µF
22µF
50V
0.007Ω
20k
15k
VOUT1
3.3V
5A
150µF
0.1µF
193k
7.2µH
680pF
0.010Ω
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
TRACK/SS1
TRACK/SS2
VIN
9V TO 38V
38571 TA01
0.1µF
0.1µF
LTC3857-1
Efficiency and Power Loss
vs Output Current
TheLTC®3857-1isahighperformancedualstep-down
switchingregulatorcontrollerthatdrivesallN-channel
synchronouspowerMOSFETstages.Aconstantfrequency
currentmodearchitectureallowsaphase-lockablefre-
quencyofupto850kHz.Powerlossandnoiseduetothe
ESRoftheinputcapacitorESRareminimizedbyoperating
thetwocontrolleroutputstagesoutofphase.
The50μAno-loadquiescentcurrentextendsoperatinglife
inbattery-poweredsystems.TheLTC3857-1featuresapre-
cision0.8Vreferenceandapowergoodoutputindicator.A
wide4Vto38Vinputsupplyrangeencompassesawiderange
ofintermediatebusvoltagesandbatterychemistries.
IndependentTRACK/SSpinsforeachcontrollerrampthe
outputvoltagesduringstart-up.Currentfoldbacklimits
MOSFETheatdissipationduringshort-circuitconditions.
ThePLLIN/MODEpinselectsamongBurstModeopera-
tion,pulse-skippingmode,orcontinuousinductorcurrent
modeatlightloads.
Foraleadless32-pinQFNpackagewiththeadditionalfea-
turesofadjustablecurrentlimit,clockout,phasemodula-
tionandtwoPGOODoutputs,seetheLTC3857datasheet.
OUTPUT CURRENT (A)
0.00001 0.0001
40
50
60
70
80
0.001 0.01
0.1
1
10
3857 TA01b
30
20
10
0
90
100
10
100
1000
1
0.1
10000
VIN = 12V
VOUT = 3.3V
FIGURE 13 CIRCUIT
L
,LT,LTC,LTM,BurstMode,OPTI-LOOP,µModule,LinearTechnologyandtheLinearlogo
areregisteredtrademarksandNoRSENSEandUltraFastaretrademarksofLinearTechnology
Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.Protectedby
U.S.Patents,including5481178,5929620,6177787,6144194,5408150,6580258,5705919,
6100678.


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