LT3514
4
3514fa
For more information www.linear.com/LT3514
Efficiency, Channel 4, f = 1MHz
Efficiency, Channel 4, f = 1MHz
Efficiency, Channel 4, f = 1MHz
ELECTRICAL CHARACTERISTICS
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: The LT3514E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3514I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Current flows into pin.
Note 4: The V
IN
pin quiescent current and the SKY pin quiescent current
are specified in the Electrical Characteristics table. However, the quiescent
current for an application circuit is higher than the sum of these two
currents because the SKY voltage is higher than V
IN
, and there are power
losses in the boost regulator. See the Typical Performance Characteristics
section for a plot of input quiescent current vs input voltage for a typical
application.
Note 5: Current flows out of pin.
Note 6: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 7: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
LOAD CURRENT (A)
0
EFFICIENCY (%)
40
60
1
20
0
0.2
0.1 0.3
0.5
0.4
0.6
0.7
0.9
0.8
80
30
50
10
70
V
IN
= 6V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
OUT
= 1.8V
LOAD CURRENT (A)
0
EFFICIENCY (%)
40
60
1
3514 G02
20
0
0.2
0.1 0.3
0.5
0.4
0.6
0.7
0.9
0.8
90
80
30
50
10
70
V
IN
= 6V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
OUT
= 2.5V
LOAD CURRENT (A)
0
EFFICIENCY (%)
40
60
1
20
0
0.2
0.1 0.3
0.5
0.4
0.6
0.7
0.9
0.8
90
80
30
50
10
70
V
IN
= 6V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
OUT
= 3.3V
SYMBOL CONDITIONS MIN TYP MAX UNITS
PG Voltage Output Low I
PG
= 250µA 180 300 mV
PG Pin Leakage V
PG
= 2V 0.01 1 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise noted.
