LTC3443 Datasheet, PDF (3/16 Pages) Linear Technology – High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter

LTC3443
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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
100
90 Burst Mode
80 ^OPERATION
70
V_IN = 2.7V
60
50
V_IN = 4.2V
V_IN = 3.3V
V_OUT
200mV/DIV
AC-COUPLED
MODE
5V/DIV
40
V_OUT = 3.3V
500µs/DIV
3443 G03
30
V_IN = 3.3V
20
I_OUT = 30mA
10
0
0.1
1.0
10
100
1000
OUTPUT CURRENT (mA)
3443 G01
MODE Transient Response:
Fixed Frequency to Burst Mode
Operation
V_OUT
100mV/DIV
AC-COUPLED
MODE
5V/DIV
V_OUT = 3.3V
V_IN = 3.3V
I_OUT = 30mA
500µs/DIV
3443 G03
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
sn3443 3443fs
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