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| LTC3862 Datasheet, PDF (4/40 Pages) Linear Technology – Multi-Phase Current Mode Step-Up DC/DC Controller | |||
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LTC3862
ELECTRICAL CHARACTERISTICS (Notes 2, 3) The l denotes the speciï¬cations which apply over the full
operating junction temperature range, otherwise speciï¬cations are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless
otherwise noted.
SYMBOL
fSYNC
VSYNC
IPLLFLTR
CH1-CH2
CH1-CLKOUT
DMAX
tON(MIN)1
tON(MIN)2
tON(MIN)3
Gate Driver
RDS(ON)
Overvoltage
VFB(OV)
PARAMETER
SYNC Minimum Input Frequency
SYNC Maximum Input Frequency
SYNC Input Threshold
Phase Detector Sourcing Output Current
Phase Detector Sinking Output Current
Channel 1 to Channel 2 Phase Relationship
Channel 1 to CLKOUT Phase Relationship
Maximum Duty Cycle
Minimum On-Time
Minimum On-Time
Minimum On-Time
Driver Pull-Up RDS(ON)
Driver Pull-Down RDS(ON)
VFB, Overvoltage Lockout Threshold
CONDITIONS
VSYNC = External Clock
VSYNC = External Clock
Rising Threshold
fSYNC > fOSC
fSYNC < fOSC
VPHASEMODE = 0V
VPHASEMODE = Float
VPHASEMODE = 3V8
VPHASEMODE = 0V
VPHASEMODE = Float
VPHASEMODE = 3V8
VDMAX = 0V
VDMAX = Float
VDMAX = 3V8
VBLANK = 0V (Note 8)
VBLANK = Float (Note 8)
VBLANK = 3V8 (Note 8)
VFB(OV) â VFB(NOM) in Percent
MIN TYP MAX UNITS
l
50
kHz
l 650
kHz
1.5
V
â15
μA
15
μA
180
Deg
180
Deg
120
Deg
90
Deg
60
Deg
240
Deg
96
%
84
%
75
%
180
ns
260
ns
340
ns
2.1
Ω
0.7
Ω
8
10
12
%
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
reliability and lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
speciï¬ed.
Note 3: The LTC3862E is guaranted to meet performance speciï¬cations
from 0°C to 85°C. Speciï¬cations over the â40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3862I is guaranteed
over the full â40°C to 125°C operating junction temperature range and
the LTC3862H is guaranteed over the full â40°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Continuous
operation above the speciï¬ed maximum operating junction temperature
may impair device reliability.
Note 5: Supply current in normal operation is dominated by the current
needed to charge the external MOSFET gates. This current will vary with
supply voltage and the external MOSFETs used.
Note 6: The IC is tested in a feedback loop that adjusts VFB to achieve a
speciï¬ed error ampliï¬er output voltage.
Note 7: Guaranteed by design, not subject to test.
Note 8: The minimum on-time condition is speciï¬ed for an inductor peak-
to-peak ripple current = 30% (see Minimum On-Time Considerations in the
Applications Information section).
3862fb
4
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