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LTC3879_15 Datasheet, PDF (3/28 Pages) Linear Technology – Fast, Wide Operating Range No RSENSE Step-Down Controller
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LTC3879
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
Input Operating Voltage Range
4
38
V
IQ
Input DC Supply Current
Normal
Shutdown Supply Current
1350 2000
μA
18
35
μA
VFBREF
IFB
gm(EA)
VMODE
tON
tON(MIN)
tOFF(MIN)
VSENSE(MAX)
VSENSE(MIN)
VRUN
IRUN
ITRACK/SS
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Input Current
Error Amplifier Transconductance
MODE Threshold
MODE Pin Current
On-Time
Minimum On-Time
Minimum Off-Time
Valley Current Sense Threshold
VPGND – VSW
Peak Current = Valley + Ripple
Minimum Current Sense Threshold
VPGND – VSW
Force Continuous Operation
RUN On Threshold
RUN Pull-Up Current
Soft-Start Charging Current
INTVCC Undervoltage Lockout
INTVCC Undervoltage Lockout Release
TG Driver Pull-Up On-Resistance
ITH = 1.2V (Note 3)
VIN = 4V to 30V, ITH = 1.2V (Note 3)
ITH = 0.5V to 1.9V (Note 3)
VFB = 0.6V
ITH = 1.2V (Note 3)
VMODE = 0.8V
ION = 30μA
ION = 15μA
ION = 180μA
ION = 30μA
VRNG = 1V, VFB = 0.56V
VRNG = 0V, VFB = 0.56V
VRNG = INTVCC, VFB = 0.56V
VRNG = 1V, VFB = 0.64V
VRNG = 0V, VFB = 0.64V
VRNG = INTVCC, VFB = 0.64V
VRUN Rising
VRUN = 0V
VTRACK/SS = 0V
Falling
Rising
TG High
l 0.594 0.6 0.606
V
0.005
%/V
l
–0.05 –0.3
%
–5
±50
nA
1.4
1.7
2
mS
0.76
0.8
0.84
V
0
±1
μA
198
233
268
ns
370
440
510
ns
43
75
ns
220
300
ns
l 108
133
165
mV
l 22
30
48
mV
l 62
75
98
mV
–61
mV
–12
mV
–33
mV
1.3
1.5
1.7
V
–1.2
μA
–0.45 –1
–2
μA
l
3.3
3.9
V
l
3.6
4
V
2.5
Ω
TG Driver Pull-Down On-Resistance TG Low
1.2
Ω
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
TG Rise Time
TG Fall Time
BG Rise Time
BG Fall Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
BG High
BG Low
CLOAD = 3300pF (Note 5)
CLOAD = 3300pF (Note 5)
CLOAD = 3300pF (Note 5)
CLOAD = 3300pF (Note 5)
CLOAD = 3300pF Each Driver (Note 5)
2.5
Ω
0.7
Ω
20
ns
20
ns
20
ns
20
ns
15
ns
Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver (Note 5)
Top Switch-On Delay Time
15
ns
3879f
3
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