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LTC3868IGN-1TRPBF Datasheet(PDF) 8 Page - Linear Technology

Part # LTC3868IGN-1TRPBF
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

LTC3868IGN-1TRPBF Datasheet(HTML) 8 Page - Linear Technology

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LTC3868-1

38681fb
pin FuncTions (QFN/SSOP)
SENSE1, SENSE2(Pin 2, Pin 4/Pin 8, Pin 10):The(–)
InputtotheDifferentialCurrentComparators.Whengreater
thanINTVCC–0.5V,theSENSEpinsuppliescurrentto
thecurrentcomparator.
FREQ (Pin 3/Pin 5):TheFrequencyControlPinforthe
InternalVCO.ConnectingthispintoGNDforcestheVCO
toafixedlowfrequencyof350kHz.Connectingthispin
toINTVCCforcestheVCOtoafixedhighfrequencyof
535kHz.Otherfrequenciesbetween50kHzand900kHzcan
beprogrammedusingaresistorbetweenFREQandGND.
Aninternal20µApull-upcurrentdevelopsthevoltageto
beusedbytheVCOtocontrolthefrequency
PLLIN/MODE (Pin 4/Pin 6): External Synchronization
Input to Phase Detector and Forced Continuous Mode
Input.Whenanexternalclockisappliedtothispin,the
phase-lockedloopwillforcetherisingTG1signaltobe
synchronizedwiththerisingedgeoftheexternalclock.
Whennotsynchronizingtoanexternalclock,thisinput,
which acts on both controllers, determines how the
LTC3868-1 operates at light loads. Pulling this pin to
groundselectsBurstModeoperation.Aninternal100k
resistor to ground also invokes Burst Mode operation
whenthepinisfloated.TyingthispintoINTVCCforces
continuousinductorcurrentoperation.Tyingthispinto
avoltagegreaterthan1.2VandlessthanINTVCC–1.3V
selectspulse-skippingoperation.
SGND (Pin 5, Exposed Pad Pin 29/Pin 7):Small-signal
ground common to both controllers, must be routed
separatelyfromhighcurrentgroundstothecommon(–)
terminalsoftheCINcapacitors.Theexposedpad(QFN
only) must be soldered to the PCB for rated thermal
performance.
RUN1, RUN2 (Pin 6, Pin 8/Pin 7, Pin 9):DigitalRun
ControlInputsforEachController.Forcingeitherofthese
pinsbelow1.26Vshutsdownthatcontroller.Forcingboth
ofthesepinsbelow0.7VshutsdowntheentireLTC3868-1,
reducingquiescentcurrenttoapproximately8µA.Donot
floatthesepins.
INTVCC vs Load Current
Latchoff Thresholds
vs Temperature
Typical perForMance characTerisTics
LOAD CURRENT (mA)
0
5.10
5.15
5.20
160
38681 G26
5.05
5.00
4.95
20 40 60 80 100 120 140
180 200
EXTVCC = 0V
VIN = 12V
EXTVCC = 8V
TEMPERATURE (°C)
–45
1.2
1.3
1.5
1.6
1.7
2.3
2.2
1.9
5
55
80
38681 G27
1.4
2.0
2.1
1.8
–20
30
105 130
ARMING THRESHOLD
LATCH-OFF THRESHOLD


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