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LTC3443 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3443
Description  High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3443 Datasheet(HTML) 3 Page - Linear Technology

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LTC3443
3
sn3443 3443fs
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.
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
VOUT Ripple at 1A Load
VOUT
20mV/DIV
AC-COUPLED
BUCK
VIN = 4.2V
BUCK-BOOST
VIN = 3.3V
BOOST
VIN = 2.7V
IOUT = 1A
2µs/DIV
3443 G02
VOUT = 3.3V
Li-Ion to 3.3V Efficiency
OUTPUT CURRENT (mA)
0.1
40
50
60
70
80
1.0
10
100
1000
3443 G01
30
20
10
0
90
100
Burst Mode
OPERATION
VIN = 4.2V
VIN = 3.3V
VIN = 2.7V
(TA = 25°C unless otherwise specified)
Load Transient Response,
100mA to 1A
VOUT
100mV/DIV
1A
100mA
100µs/DIV
3443 G03
MODE Transient Response:
Burst Mode Operation to Fixed
Frequency
VOUT
200mV/DIV
AC-COUPLED
MODE
5V/DIV
VOUT = 3.3V
500µs/DIV
3443 G03
VIN = 3.3V
IOUT = 30mA
VOUT
100mV/DIV
AC-COUPLED
MODE
5V/DIV
VOUT = 3.3V
500µs/DIV
3443 G03
VIN = 3.3V
IOUT = 30mA
MODE Transient Response:
Fixed Frequency to Burst Mode
Operation


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