LTC3535 Datasheet, PDF (3/16 Pages) Linear Technology – Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter

LTC3535
ELECTRICAL CHARACTERISTICS (For each channel) The l denotes the specifications which apply over the specified
operating temperature range of –40°C to 85°C, otherwise specifications are at T_A = 25°C. V_IN = 1.2V, V_OUT = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Duty Cycle
Switching Frequency
SHDN Pin Input High Voltage
SHDN Pin Input Low Voltage
V_FB = 1.3V
l
0
%
l 0.75
1
1.25
MHz
0.8
V
0.3
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: The LTC3535 is guaranteed 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.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current measurements are made when the output is not switching.
Note 5: 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 result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
60°C/W.
TYPICAL PERFORMANCE CHARACTERISTICS (Each Channel) T_A = 25°C, unless otherwise noted.
Efficiency vs Load Current
and V_IN for V_OUT = 1.8V
100
1000
90 ^EFFICIENCY
80
100
70
60
10
50
POWER LOSS
40
1
30
20
10
0
0.01
V_IN = 1.0V 0.1
V_IN = 1.2V
V_IN = 1.5V
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
3535 G01
Efficiency vs Load Current
and V_IN for V_OUT = 3.3V
100
EFFICIENCY
90
1000
80
100
70
60
10
50
POWER LOSS
40
1
30
20
10
0
0.01
V_IN = 1.2V
V_IN = 1.8V ^0.1
V_IN = 2.4V
V_IN = 3.0V
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
3535 G02
No-Load Input Current vs V_IN
100
90
V_OUT = 5V
80
70
V_OUT = 3.3V
60
V_OUT = 2.5V
50
V_OUT = 1.8V
40
30
20
10
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3535 G04
3535f
3