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LTC3868 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC3868
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

LTC3868 Datasheet(HTML) 8 Page - Linear Technology

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LTC3868

3868fb
pin FuncTions
SENSE1, SENSE2(Pin 1, Pin 9):The(–)Inputtothe
Differential Current Comparators. When greater than
INTVCC–0.5V,theSENSEpinsuppliescurrenttothe
currentcomparator.
FREQ (Pin 2):TheFrequencyControlPinfortheInternal
VCO.ConnectingthispintoGNDforcestheVCOtoafixed
lowfrequencyof350kHz.ConnectingthispintoINTVCC
forces the VCO to a fixed high frequency of 535kHz.
Other frequencies between 50kHz and 900kHz can be
programmedusingaresistorbetweenFREQandGND.
Aninternal20µApull-upcurrentdevelopsthevoltageto
beusedbytheVCOtocontrolthefrequency
PHASMD (Pin 3):Controlinputtophaseselectorwhich
determinesthephaserelationshipsbetweencontroller1,
controller2andtheCLKOUTsignal.Pullingthispinto
groundforcesTG2andCLKOUTtobeoutofphase180°
and60°withrespecttoTG1.ConnectingthispintoINTVCC
forcesTG2andCLKOUTtobeoutofphase240°and120°
with respect to TG1. Floating this pin forces TG2 and
CLKOUTtobeoutofphase180°and90°withrespectto
TG1.RefertotheTable1.
CLKOUT (Pin 4):Outputclocksignalavailabletodaisy-
chainothercontrollerICsforadditionalMOSFETdriver
stages/phases.TheoutputlevelsswingfromINTVCCto
ground.
PLLIN/MODE (Pin 5):ExternalSynchronizationInputto
PhaseDetectorandForcedContinuousModeInput.When
anexternalclockisappliedtothispin,thephase-locked
loopwillforcetherisingTG1signaltobesynchronized
withtherisingedgeoftheexternalclock.Whennotsyn-
chronizingtoanexternalclock,thisinput,whichactson
bothcontrollers,determineshowtheLTC3868operatesat
lightloads.PullingthispintogroundselectsBurstMode
operation.Aninternal100kresistortogroundalsoinvokes
BurstModeoperationwhenthepinisfloated.Tyingthispin
toINTVCCforcescontinuousinductorcurrentoperation.
Tyingthispintoavoltagegreaterthan1.2Vandlessthan
INTVCC–1.3Vselectspulse-skippingoperation.
SGND (Pin 6, Exposed Pad Pin 33):Small-signalground
commontobothcontrollers,mustberoutedseparately
fromhighcurrentgroundstothecommon(–)terminals
oftheCINcapacitors.Theexposedpadmustbesoldered
tothePCBforratedthermalperformance.
INTVCC and EXTVCC vs Load Current
Latchoff Thresholds
vs Temperature
LOAD CURRENT (mA)
0
5.10
5.15
5.20
160
3868 G26
5.05
5.00
4.95
20 40 60 80 100 120 140
180 200
EXTVCC = 0V
VIN = 12V
EXTVCC = 8V
Typical perForMance characTerisTics
TEMPERATURE (°C)
–45
1.2
1.3
1.5
1.6
1.7
2.3
2.2
1.9
5
55
80
3868 G27
1.4
2.0
2.1
1.8
–20
30
105 130
ARMING THRESHOLD
LATCH-OFF THRESHOLD


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