LTC3443_15 Datasheet, PDF (3/16 Pages) Linear Technology – High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter

LTC3443
ELECTRICAL CHARACTERISTICS _{The ● denotes the specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_IN = V_OUT = 3.6V,unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
SHDN/SS Threshold
SHDN/SS Threshold
When IC is Enabled
When EA is at Max Boost Duty Cycle
● 0.4
1
1.4
V
2
2.4
V
SHDN/SS Input Current
V_SHDN = 5.5V
0.01
1
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 LTC3443E is guaranteed to meet performance specifications
from 0°C to 70°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: Current measurements are performed when the outputs are not
switching.
Note 4: 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.
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise specified)
Li-Ion to 3.3V Efficiency
MODE Transient Response:
Burst Mode Operation to Fixed
Frequency
MODE Transient Response:
Fixed Frequency to Burst Mode
Operation
100
90 Burst Mode
OPERATION
80
70
V_IN = 2.7V
60
50
V_IN = 4.2V
V_IN = 3.3V
V_OUT
200mV/DIV
AC-COUPLED
MODE
5V/DIV
V_OUT
100mV/DIV
AC-COUPLED
MODE
5V/DIV
40
V_OUT = 3.3V
500μs/DIV
3443 G03
V_OUT = 3.3V
500μs/DIV
3443 G03
30
V_IN = 3.3V
V_IN = 3.3V
20
I_OUT = 30mA
I_OUT = 30mA
10
0
0.1
1.0
10
100
1000
OUTPUT CURRENT (mA)
3443 G01
V_OUT Ripple at 1A Load
Load Transient Response,
100mA to 1A
V_OUT
20mV/DIV
AC-COUPLED
I_OUT = 1A
V_OUT = 3.3V
2μs/DIV
BUCK
V_IN = 4.2V
BUCK-BOOST
V_IN = 3.3V
BOOST
V_IN = 2.7V
3443 G02
V_OUT
100mV/DIV
1A
100mA
100μs/DIV
3443 G03
3443fa
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