Datasheet

LTC3441
3
3441fa
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 LTC3441E 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 preformed 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
UW
Load Transient Response,
100mA to 1A
V
OUT
100mV/DIV
1A
100mA
100μs/DIV
3441 G01
V
OUT
Ripple at 1A Load
V
OUT
10mV/DIV
AC-COUPLED
BUCK
V
IN
= 4.2V
BUCK-BOOST
V
IN
= 3.3V
BOOST
V
IN
= 2.7V
L = 4.7μH1μs/DIV
3441 G02
C
OUT
= 47μF
I
OUT
= 1A
V
OUT
= 3.3V
Switch Pins in Buck-Boost Mode
SW1
2V/DIV
V
IN
= 3.3V 50ns/DIV 3441 G03
V
OUT
= 3.3V
I
OUT
= 500mA
SW2
2V/DIV
SW1
2V/DIV
V
IN
= 4.2V 50ns/DIV 3441 G04
V
OUT
= 3.3V
I
OUT
= 500mA
SW2
2V/DIV
Switch Pins Entering
Buck-Boost Mode
Efficiency
I
OUT
(mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3441 G17
0
1
Burst Mode
OPERATION
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
= 3.3V