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LTC3868IGN-1TRPBF Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3868IGN-1TRPBF
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-1TRPBF Datasheet(HTML) 3 Page - Linear Technology

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LTC3868-1

38681fb
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
InputSupplyOperatingVoltageRange
4
24
V
VFB1,2
RegulatedFeedbackVoltage
(Note4)ITH1,2Voltage=1.2V
l
0.788
0.8
0.812
V
IFB1,2
FeedbackCurrent
(Note4)
±5
±50
nA
VREFLNREG
ReferenceVoltageLineRegulation
(Note4)VIN=4.5Vto24V
0.002
0.02
%/V
VLOADREG
OutputVoltageLoadRegulation
(Note4)
MeasuredinServoLoop,
∆ITHVoltage=1.2Vto0.7V
l
0.01
0.1
%
(Note4)
MeasuredinServoLoop,
∆ITHVoltage=1.2Vto2V
l
–0.01
–0.1
%
gm1,2
TransconductanceAmplifiergm
(Note4)ITH1,2=1.2V,Sink/Source=5µA
2
mmho
IQ
InputDCSupplyCurrent
(Note5)
Pulse-SkippingorForcedContinuous
Mode
(OneChannelOn)
RUN1=5VandRUN2=0Vor
RUN1=0VandRUN2=5V,
VFB1=0.83V(NoLoad)
1.3
mA
Pulse-SkippingorForcedContinuous
Mode
(BothChannelsOn)
RUN1,2=5V,VFB1,2=0.83V(NoLoad)
2
mA
SleepMode(OneChannelOn)
RUN1=5VandRUN2=0Vor
RUN1=0VandRUN2=5V,
VFB1=0.83V(NoLoad)
170
250
µA
SleepMode(BothChannelsOn)
RUN1,2=5V,VFB1,2=0.83V(NoLoad)
300
450
µA
Shutdown
RUN1,2=0V
8
25
µA
UVLO
UndervoltageLockout
INTVCCRampingUp
INTVCCRampingDown
l
l
3.6
4
3.8
4.2
4
V
V
VOVL
FeedbackOvervoltageProtection
MeasuredatVFB1,2,RelativetoRegulated
VFB1,2
7
10
13
%
ISENSE+
SENSE+PinCurrent
EachChannel
±1
µA
ISENSE–
SENSEPinsCurrent
EachChannel
VOUT1,2<INTVCC–0.5V
VOUT1,2>INTVCC+0.5V
540
±1
700
µA
µA
DFMAX
MaximumDutyFactor
InDropout,FREQ=0V
98
99.4
%
ISS1,2
Soft-StartChargeCurrent
VSS1,2=0V
0.7
1
1.4
µA
VRUN1,2On
RUNPinOnThreshold
VRUN1,VRUN2Rising
l
1.21
1.26
1.31
V
VRUN1,2Hyst RUNPinHysteresis
50
mV
VSS1,2LA
SSPinLatchoffArmingThreshold
VSS1,VSS2Risingfrom1V
1.9
2
2.1
V
VSS1,2LT
SSPinLatchoffThreshold
VSS1,VSS2Risingfrom2V
1.3
1.5
1.7
V
IDSC1,2LT
SSDischargeCurrent
Short-CircuitConditionVFB1,2=0.5V
VSS1,2=4.5V
7
10
13
µA
VSENSE(MAX) MaximumCurrentSenseThreshold
VFB1,2=0.7V,VSENSE1–,2–=3.3V
43
50
57
mV
Gate Driver
TG1,2
Pull-UpOn-Resistance
Pull-DownOn-Resistance
2.5
1.5
Ω
Ω
BG1,2
Pull-UpOn-Resistance
Pull-DownOn-Resistance
2.4
1.1
Ω
Ω
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.


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