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LTC3868-1 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3868-1
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

LTC3868-1 Datasheet(HTML) 4 Page - Linear Technology

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LTC3868-1

38681fb
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TG1,2tr
TG1,2tf
TGTransitionTime:
RiseTime
FallTime
(Note6)
CLOAD=3300pF
CLOAD=3300pF
25
16
ns
ns
BG1,2tr
BG1,2tf
BGTransitionTime:
RiseTime
FallTime
(Note6)
CLOAD=3300pF
CLOAD=3300pF
28
13
ns
ns
TG/BGt1D
TopGateOfftoBottomGateOnDelay
SynchronousSwitch-OnDelayTime
CLOAD=3300pFEachDriver
30
ns
BG/TGt1D
BottomGateOfftoTopGateOnDelay
TopSwitch-OnDelayTime
CLOAD=3300pFEachDriver
30
ns
tON(MIN)
MinimumOn-Time
(Note7)
95
ns
INTVCC Linear Regulator
VINTVCCVIN
InternalVCCVoltage
6V<VIN<24V,VEXTVCC=0V
4.85
5.1
5.35
V
VLDOVIN
INTVCCLoadRegulation
ICC=0mAto50mA,VEXTVCC=0V
0.7
1.1
%
VINTVCCEXT
InternalVCCVoltage
6V<VEXTVCC<13V
4.85
5.1
5.35
V
VLDOEXT
INTVCCLoadRegulation
ICC=0mAto50mA,VEXTVCC=8.5V
0.6
1.1
%
VEXTVCC
EXTVCCSwitchoverVoltage
EXTVCCRampingPositive
4.5
4.7
4.9
V
VLDOHYS
EXTVCCHysteresis
250
mV
Oscillator and Phase-Locked Loop
f25kΩ
ProgrammableFrequency
RFREQ=25k,PLLIN/MODE=DCVoltage
105
kHz
f65kΩ
ProgrammableFrequency
RFREQ=65k,PLLIN/MODE=DCVoltage
375
440
505
kHz
f105kΩ
ProgrammableFrequency
RFREQ=105k,PLLIN/MODE=DCVoltage
835
kHz
fLOW
LowFixedFrequency
VFREQ=0V,PLLIN/MODE=DCVoltage
320
350
380
kHz
fHIGH
HighFixedFrequency
VFREQ=INTVCC,PLLIN/MODE=DCVoltage
485
535
585
kHz
fSYNC
SynchronizableFrequency
PLLIN/MODE=ExternalClock
l
75
850
kHz
PGOOD1 Output
VPGL
PGOOD1VoltageLow
IPGOOD=2mA
0.2
0.4
V
IPGOOD
PGOOD1LeakageCurrent
VPGOOD=5V
±1
µA
VPG
PGOOD1TripLevel
VFBwithRespecttoSetRegulatedVoltage
VFBRampingNegative
Hysteresis
–13
–10
2.5
–7
%
%
VFBwithRespecttoSetRegulatedVoltage
VFBRampingPositive
Hysteresis
7
10
2.5
13
%
%
tPG
DelayforReportingaFault(PGOODLow)
25
µs
Note 1:StressesbeyondthoselistedunderAbsoluteMaximumRatings
maycausepermanentdamagetothedevice.ExposuretoanyAbsolute
MaximumRatingsforextendedperiodsmayaffectdevicereliabilityand
lifetime.
Note 2:TheLTC3868E-1isguaranteedtomeetperformancespecifications
from0°Cto85°C.Specificationsoverthe–40°Cto85°Coperating
temperaturerangeareassuredbydesign,characterizationandcorrelation
withstatisticalprocesscontrols.TheLTC3868I-1isguaranteedoverthe
full–40°Cto85°Coperatingtemperaturerange.
Note 3:TJiscalculatedfromtheambienttemperatureTAandpower
dissipationPDaccordingtothefollowingformula:
TJ=TA+(PD•θJA)
where
θJA=43°CfortheQFNpackageandθJA=90°CfortheSSOP
package.
Note 4:TheLTC3868-1istestedinafeedbackloopthatservosVITH1,2toa
specifiedvoltageandmeasurestheresultantVFB1,2.
Note 5:Dynamicsupplycurrentishigherduetothegatechargebeing
deliveredattheswitchingfrequency.SeeApplicationsinformation.
Note 6:Riseandfalltimesaremeasuredusing10%and90%levels.Delay
timesaremeasuredusing50%levels.
Note 7:Theminimumon-timeconditionisspecifiedforaninductor
peak-to-peakripplecurrent≥40%ofIMAX(SeeMinimumOn-Time
ConsiderationsintheApplicationsInformationsection).


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