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LTC3862EFE-TRPBF Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3862EFE-TRPBF
Description  Multi-Phase Current Mode Step-Up DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3862EFE-TRPBF Datasheet(HTML) 4 Page - Linear Technology

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LTC3862
4
3862fb
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fSYNC
SYNC Minimum Input Frequency
VSYNC = External Clock
l
50
kHz
SYNC Maximum Input Frequency
VSYNC = External Clock
l
650
kHz
VSYNC
SYNC Input Threshold
Rising Threshold
1.5
V
IPLLFLTR
Phase Detector Sourcing Output Current
fSYNC > fOSC
–15
μA
Phase Detector Sinking Output Current
fSYNC < fOSC
15
μA
CH1-CH2
Channel 1 to Channel 2 Phase Relationship
VPHASEMODE = 0V
VPHASEMODE = Float
VPHASEMODE = 3V8
180
180
120
Deg
Deg
Deg
CH1-CLKOUT
Channel 1 to CLKOUT Phase Relationship
VPHASEMODE = 0V
VPHASEMODE = Float
VPHASEMODE = 3V8
90
60
240
Deg
Deg
Deg
DMAX
Maximum Duty Cycle
VDMAX = 0V
VDMAX = Float
VDMAX = 3V8
96
84
75
%
%
%
tON(MIN)1
Minimum On-Time
VBLANK = 0V (Note 8)
180
ns
tON(MIN)2
Minimum On-Time
VBLANK = Float (Note 8)
260
ns
tON(MIN)3
Minimum On-Time
VBLANK = 3V8 (Note 8)
340
ns
Gate Driver
RDS(ON)
Driver Pull-Up RDS(ON)
2.1
Ω
Driver Pull-Down RDS(ON)
0.7
Ω
Overvoltage
VFB(OV)
VFB, Overvoltage Lockout Threshold
VFB(OV) – VFB(NOM) in Percent
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
specified.
Note 3: The LTC3862E is guaranted to meet performance specifications
from 0°C to 85°C. Specifications over the –40°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 –40°C to 125°C operating junction temperature range and
the LTC3862H is guaranteed over the full –40°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 specified 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
specified error amplifier output voltage.
Note 7: Guaranteed by design, not subject to test.
Note 8: The minimum on-time condition is specified for an inductor peak-
to-peak ripple current = 30% (see Minimum On-Time Considerations in the
Applications Information section).
ELECTRICAL CHARACTERISTICS (Notes 2, 3) The l denotes the specifications which apply over the full
operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless
otherwise noted.


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