LTC3539_15 Datasheet, PDF (3/14 Pages) Linear Technology – 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters

LTC3539/LTC3539-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
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
Maximum Duty Cycle
Minimum Duty Cycle
Switching Frequency
MODE Input High Voltage
V_FB = 1.15V
V_FB = 1.3V
LTC3539
LTC3539-2
l 87
90
%
l
0
%
l 0.7
1
1.3
MHz
l _1.8
2
2.4
MHz
0.88
V
MODE Input Low Voltage
0.3
V
MODE Input Current
SHDN Input High Voltage
V_MODE = 1.2V
0.3
1
µA
0.88
V
SHDN Input Low Voltage
0.3
V
SHDN Input Current
V_SHDN = 1.2V
V_SHDN = 3.3V
0.3
1
µA
1
2
µA
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 LTC3539E/LTC3539E-2 is guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over –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
64°C/W.
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
Efficiency vs Load Current and
V_IN, V_OUT = 1.8V
100
1000
90
80
100
70
EFFICIENCY
60
10
50
POWER LOSS
40
1
30
20
10
0
0.1
V_IN = 1V ^0.1
V_IN = 1.2V
V_IN = 1.5V _0.01
1
10
100
1000
LOAD CURRENT (mA)
3539 G01
Efficiency vs Load Current and
V_IN, V_OUT = 3.3V
100
1000
90
80
100
70
EFFICIENCY
60
50
10
40
30
20
10
0
0.1
POWER LOSS
1
V_IN = 1.2V
V_IN = 1.8V
V_IN = 3V _0.1
1
10
100
1000
LOAD CURRENT (mA)
3539 G02
For more information www.linear.com/3539/3539-2
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