LTC3125 Linear Technology, LTC3125 Datasheet - Page 3

• Manufacturer Part Number: LTC3125
• Description: 1.2A Synchronous Step-Up DC/DC Converter
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
PARAMETER
PROG Current Gain
Maximum Duty Cycle
Minimum Duty Cycle
Frequency
SHDN Input High
SHDN Input Low
SHDN Input Current
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 LTC3125 is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Specifi cation is guaranteed by design and not 100% tested in
production.
temperature range, otherwise specifi cations are at T
TYPICAL PERFORMANCE CHARACTERISTICS
100
90
80
70
60
50
40
30
20
10
0
0.001
Effi ciency vs Load Current,
V
OUT
= 2.5V
0.01
LOAD CURRENT (A)
0.1
CONDITIONS
(Note 3)
V
V
V
FB
FB
SHDN
V
V
IN
IN
= 1.15V
= 1.3V
= 2.1V
= 1.8V
3125 G01
= 1.2V
A
1
= 25°C. V
0.1
0.01
0.001
0.0001
1
The
l
IN
denotes the specifi cations which apply over the full operating
= 3.3V, V
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 specifi ed 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.
OUT
100
20
10
90
80
70
60
50
40
30
0.001
0
= 4.5V unless otherwise noted.
Effi ciency vs Load Current,
V
OUT
(T
A
= 3.3V
= 25°C unless otherwise noted)
0.01
LOAD CURRENT (A)
l
l
l
0.1
MIN
1.3
85
1
V
V
V
IN
IN
IN
= 2.8V
= 2.4V
= 2V
3125 G02
22.1
TYP
1.6
0.3
92
1
1
0.1
0.01
0.001
LTC3125
MAX
0.35
1.9
0
1
kΩ-A/A
UNITS
3
MHz
3125f
μA
%
%
V
V