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| LTC3708_15 Datasheet, PDF (4/32 Pages) Linear Technology – Fast 2-Phase, No RSENSE Buck Controller with Output Tracking | |||
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LTC3708
ELECTRICAL CHARACTERISTICS The l denotes the speciï¬cations which apply over the full operating
temperature range, otherwise speciï¬cations are at TA = 25°C. VCC = 5V, DRVCC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
IINTLPF
tON(PLL)1
tON(PLL)2
Internal Phase Detector Output Current
Sourcing Capability
Sinking Capability
tON1 Modulation Range by External PLL
Up Modulation
Down Modulation
tON2 Modulation Range by Internal PLL
Up Modulation
Down Modulation
fSW1 < fSW2, VINTLPF = 0V
fSW1 > fSW2, VINTLPF = 2.4
ION1 = 60μA, VEXTLPF = 1.8V
ION1 = 60μA, VEXTLPF = 0.6V
ION1 = 60μA, VEXTLPF = 1.8V
ION1 = 60μA, VEXTLPF = 0.6V
20
â20
186
233
58
80
186
233
58
80
UNITS
μA
μA
ns
ns
ns
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliabilty and lifetime.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD as follows:
TJ = TA + (PD ⢠34°C/W)
Note 3: The LTC3708 is tested in a feedback loop that adjusts VFB to
achieve a speciï¬ed error ampliï¬er output voltage (ITH).
Note 4: Internal reference voltage is tested indirectly by extracting error
ampliï¬er offset from the feedback voltage.
Note 5: The LTC3708E is guaranteed to meet performance speciï¬cations
from 0°C to 85°C. Speciï¬cations over the â40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 6: RDS(ON) limit is guaranteed by design and/or correlation to static
test.
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient on Channel 1
IOUT1
10A/DIV
VOUT1
100mV/DIV
VOUT2
100mV/DIV
20μs/DIV
3708 G01
Coincident Tracking
Load Transient on Channel 2
IOUT2
10A/DIV
VOUT1
100mV/DIV
VOUT2
100mV/DIV
20μs/DIV
3708 G02
Ratiometric Tracking
VOUT1
0.5V/DIV
VOUT2
0.5V/DIV
VOUT1
0.5V/DIV
VOUT2
0.5V/DIV
2ms/DIV
3708 G03
2ms/DIV
3708 G04
3708fb
4
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