Datasheet

LTC3529
3
3529fb
LOAD CURRENT (mA)
1 100010010
3529 G01
V
IN
= 3V
V
IN
= 1.8V
V
IN
= 3V
V
IN
= 1.8V
C
OUT
= 10μF
INDUCTOR = 4.7μH,
COOPER BUSSMANN SD25-4R7
POWER LOSS (W)
0.7
0.6
0
0.5
0.4
0.3
0.2
0.1
POWER LOSS
EFFICIENCY
EFFICIENCY (%)
100
90
80
70
0
10
20
30
60
50
40
LOAD CURRENT (mA)
1
EFFICIENCY (%)
100010010
3529 G02
100
90
80
70
0
10
20
30
60
50
40
C
OUT
= 10μF
INDUCTOR = 4.7μH,
COOPER BUSSMANN SD25-4R7
POWER LOSS (W)
0.7
0.6
0
0.5
0.4
0.3
0.2
0.1
V
IN
= 3V
V
IN
= 3.6V
V
IN
= 4.1V
POWER LOSS
EFFICIENCY
ELECTRICAL CHARACTERISTICS
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 LTC3529 is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, V
OUT
= 5V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
FAULT Delay Time V
OUT
= 0V 12 22 35 ms
FAULT Output Low Voltage I
FAULT
= 5mA, V
OUT
= 0V 60 mV
FAULT Leakage Current V
FAULT
= 5.5V 10 μA
Note 3: 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 specifi ed maximum operating junction
temperature may impair device reliability.
Note 4: Current measurements are performed when the LTC3529 is not
switching. The current limit values in operation will be somewhat higher
due to the propagation delay of the comparators.
Note 5: Specifi cation is guaranteed by design and not 100% tested in
production.
2 Alkaline Cells to 5V Effi ciency Li-Ion Battery to 5V Effi ciency
Load Transient Response
TYPICAL PERFORMANCE CHARACTERISTICS
Soft-Start Waveforms
2ms/DIV
3529 G03
V
OUT
5V/DIV
I
L
200mA/DIV
SHDN
5V/DIV
V
IN
= 3.6V
V
OUT
= 5V
C
OUT
= 10μF
L = 2.2μH
200μs/DIV
3529 G04
V
OUT
200mV/DIV
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 5V
C
OUT
= 10μF
L = 2.2μH
V
OUT
Ripple
1μs/DIV
3529 G05
V
OUT
5mV/DIV
V
IN
= 3.6V
C
OUT
= 10μF
L = 4.7μH
I
LOAD
= 200mA