LTC3862 LINER [Linear Technology], LTC3862 Datasheet - Page 4

• Manufacturer Part Number: LTC3862
• Description: Multi-Phase Current Mode Step-Up DC/DC Controller
• Manufacturer: LINER [Linear Technology]

LTC3862
ELECTRICAL CHARACTERISTICS
SYMBOL
f
V
I
CH1-CH2
CH1-CLKOUT
D
t
t
t
Gate Driver
R
Overvoltage
V
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
specifi ed.
Note 3: The LTC3862E is guaranted to meet performance specifi cations
from 0°C to 85°C. Specifi cations 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.
4
operating junction temperature range, otherwise specifi cations are at T
otherwise noted.
SYNC
PLLFLTR
ON(MIN)1
ON(MIN)2
ON(MIN)3
SYNC
FB(OV)
MAX
DS(ON)
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 R
Driver Pull-Down R
V
FB
, Overvoltage Lockout Threshold
DS(ON)
DS(ON)
CONDITIONS
V
V
Rising Threshold
f
f
V
V
V
V
V
V
V
V
V
V
V
V
V
SYNC
SYNC
SYNC
SYNC
PHASEMODE
PHASEMODE
PHASEMODE
PHASEMODE
PHASEMODE
PHASEMODE
DMAX
DMAX
DMAX
BLANK
BLANK
BLANK
FB(OV)
(Notes 2, 3) The
> f
< f
= External Clock
= External Clock
= 0V
= Float
= 3V8
= 0V (Note 8)
= Float (Note 8)
= 3V8 (Note 8)
– V
OSC
OSC
FB(NOM)
= 0V
= Float
= 3V8
= 0V
= Float
= 3V8
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Continuous
operation above the specifi 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 V
specifi ed error amplifi er output voltage.
Note 7: Guaranteed by design, not subject to test.
Note 8: The minimum on-time condition is specifi ed for an inductor peak-
to-peak ripple current = 30% (see Minimum On-Time Considerations in the
Applications Information section).
A
in Percent
= 25°C. V
l
denotes the specifi cations which apply over the full
IN
= 12V, RUN = 2V and SS = open, unless
l
l
MIN
650
8
TYP
–15
180
180
120
240
180
260
340
1.5
2.1
0.7
15
90
60
96
84
75
10
FB
MAX
50
12
to achieve a
UNITS
3862fb
Deg
Deg
Deg
Deg
Deg
Deg
kHz
kHz
μA
μA
ns
ns
ns
%
%
%
%
Ω
Ω
V