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LTC3862HGN-1-PBF Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3862HGN-1-PBF
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

LTC3862HGN-1-PBF Datasheet(HTML) 4 Page - Linear Technology

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LTC3862-1
4
38621f
ELECTRICAL CHARACTERISTICS (Notes 2, 3) The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RUN/Soft-Start
IRUN
RUN Source Current
VRUN = 0V
VRUN = 1.5V
–0.5
–5
μA
μA
VRUN
High Level RUN Channel Enable Threshold
1.22
V
VRUNHYS
RUN Threshold Hysteresis
80
mV
ISS
SS Pull-Up Current
VSS = 0V
–5
μA
RSS
SS Pull-Down Resistance
VRUN = 0V
10
Oscillator
fOSC
Oscillator Frequency
RFREQ = 45.6k
RFREQ = 45.6k
l
280
260
300
300
320
340
kHz
kHz
Oscillator Frequency Range
l
75
500
kHz
VFREQ
Nominal FREQ Pin Voltage
RFREQ = 45.6k
1.223
V
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)
210
ns
tON(MIN)2
Minimum On-Time
VBLANK = Float (Note 8)
290
ns
tON(MIN)3
Minimum On-Time
VBLANK = 3V8 (Note 8)
375
ns
Gate Driver
RDS(ON)
Driver Pull-Up RDS(ON)
Driver Pull-Down RDS(ON)
0.9
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-1 is guaranted to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3862I-1 is guaranteed over the
full –40°C to 125°C operating temperature range and the LTC3862H-1 is
guaranteed over the full –40°C to 150°C operating 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).


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