LTC3520 Linear Technology, LTC3520 Datasheet - Page 4

• Manufacturer Part Number: LTC3520
• Description: Synchronous 1A Buck-Boost and 600mA Buck Converters
• Manufacturer: Linear Technology

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LTC3520
ELECTRICAL CHARACTERISTICS
PARAMETER
Propagation Delay
⎯ S ⎯ D ⎯ 3 Input High Voltage
⎯ S ⎯ D ⎯ 3 Input Low Voltage
⎯ S ⎯ D ⎯ 3 Input Current
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 LTC3520 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.
Note 3: Current measurements are performed when the LTC3520 is not
switching. The current limit values in operation will be somewhat higher
due to the propagation delay of the comparators.
TYPICAL PERFORMANCE CHARACTERISTICS
4
erature range, otherwise specifi cations are at T
100
90
80
70
60
50
40
30
20
10
0
Buck-Boost Effi ciency
Lithium-Ion to 3.3V
1
V
V
IN
IN
= 4.2V
= 2.7V
LOAD CURRENT (mA)
Burst Mode
OPERATION
POWER LOSS
10
Burst Mode
OPERATION
L = COILCRAFT
MSS6132-4.7µH
PWM MODE
100
CONDITIONS
A
OUT
A
Falling
= 25°C, V
1000
0
3520 G01
300
250
200
150
100
50
IN
The
= 3.6V, V
●
denotes the specifi cations which apply over the full operating temp-
Note 4: The LTC3520 is tested in a proprietary non-switching test mode
that internally connects the FB2 pin to the output of the buck converter
error amplifi er.
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 specifi ed maximum operating junction
temperature may impair device reliability.
OUT1
= 3.3V, V
100
60
90
80
70
50
40
30
20
10
0
(T
1
Buck Effi ciency
Lithium-Ion to 2.7V
Burst Mode OPERATION
A
OUT2
L = SUMIDA
CDRH3D16NP-4R7N
= 25°C, unless otherwise specifi ed)
= 1.8V, R
LOAD CURRENT (mA)
10
PWM MODE
T
= 54.9k, unless otherwise noted.
MIN
1.4
Burst Mode
OPERATION
POWER LOSS
100
0.01
TYP
11
1000
3520 G02
800
700
600
500
400
300
200
100
0
MAX
0.4
1
UNITS
3520f
µA
µs
V
V