LTC3526/LTC3526B
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 LTC3526E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3:
Specification is guaranteed by design and not 100% tested in
production.
Note 4:
Current measurements are made when the output is not switching.
Note 5:
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.
Note 6:
Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
102°C/W.
Typical perFormance characTerisTics
Efficiency vs Load Current and V
IN
for V
OUT
= 1.8V (LTC3526)
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
0.1
PLOSS AT V
IN
= 1.0V
PLOSS AT V
IN
= 1.2V
PLOSS AT V
IN
= 1.5V
1
10
100
LOAD CURRENT (mA)
0.1
1
V
IN
= 1.0V
V
IN
= 1.2V
V
IN
= 1.5V
100
POWER LOSS (mW)
EFFICIENCY (%)
1000
100
90
80
70
60
50
40
30
20
10
0
0.01
V
IN
= 1.2V
V
IN
= 1.8V
V
IN
= 2.4V
V
IN
= 3.0V
100
POWER LOSS (mW)
Efficiency vs Load Current and V
IN
for V
OUT
= 3.3V (LTC3526)
1000
100
90
80
70
I
IN
(µA)
60
50
40
30
20
No-Load Input Current vs V
IN
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
10
10
1
0.01
1000
PLOSS AT V
IN
= 1.2V
0.1
PLOSS AT V
IN
= 1.8V
PLOSS AT V
IN
= 2.4V
PLOSS AT V
IN
= 3.0V
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
3526 G02
10
0.5
1.0
1.5
2.0
2.5
V
IN
(V)
3.0
3.5
4.0
4.5
3526 G01
3526 G04
Efficiency vs Load Current and V
IN
for V
OUT
= 5V (LTC3526)
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
10
V
IN
= 1.2V
V
IN
= 2.4V
V
IN
= 3.6V 1
V
IN
= 4.2V
100
POWER LOSS (mW)
1000
400
350
300
I
OUT
(mA)
250
200
150
100
50
Maximum Output Current vs V
IN
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
LOAD ( )
4.0
4.5
1000
Minimum Load Resistance
During Start-Up vs V
IN
V
OUT
= 5V
100
PLOSS AT V
IN
= 1.2V
0.1
PLOSS AT V
IN
= 2.4V
PLOSS AT V
IN
= 3.6V
PLOSS AT V
IN
= 4.2V
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
3526 G03
0
0.5
L = 4.7µH
1.0
1.5
2.0
2.5
V
IN
(V)
3526 G05
3.0
3.5
10
0.85
0.95
1.05
V
IN
(V)
1.15
1.25
3526 G06
3526bfd
LINER [ LINEAR TECHNOLOGY ]
