Datasheet

LTC3443
3
3443fa
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
UW
V
OUT
Ripple at 1A Load
V
OUT
20mV/DIV
AC-COUPLED
BUCK
V
IN
= 4.2V
BUCK-BOOST
V
IN
= 3.3V
BOOST
V
IN
= 2.7V
I
OUT
= 1A 2μs/DIV 3443 G02
V
OUT
= 3.3V
Li-Ion to 3.3V Efficiency
OUTPUT CURRENT (mA)
0.1
40
EFFICIENCY (%)
50
60
70
80
1.0 10 100 1000
3443 G01
30
20
10
0
90
100
Burst Mode
OPERATION
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 2.7V
(T
A
= 25°C unless otherwise specified)
Load Transient Response,
100mA to 1A
V
OUT
100mV/DIV
1A
100mA
100μs/DIV
3443 G03
MODE Transient Response:
Burst Mode Operation to Fixed
Frequency
V
OUT
200mV/DIV
AC-COUPLED
MODE
5V/DIV
V
OUT
= 3.3V 500μs/DIV 3443 G03
V
IN
= 3.3V
I
OUT
= 30mA
V
OUT
100mV/DIV
AC-COUPLED
MODE
5V/DIV
V
OUT
= 3.3V 500μs/DIV 3443 G03
V
IN
= 3.3V
I
OUT
= 30mA
MODE Transient Response:
Fixed Frequency to Burst Mode
Operation
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.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN/SS Threshold When IC is Enabled ● 0.4 1 1.4 V
SHDN/SS Threshold When EA is at Max Boost Duty Cycle 2 2.4 V
SHDN/SS Input Current V
SHDN
= 5.5V 0.01 1 μA