LTC3521IFE Просмотр технического описания (PDF) - Linear Technology
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LTC3521IFE Datasheet PDF : 22 Pages
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LTC3521
Electrical Characteristics
Note 3: Current measurements are performed when the LTC3521 is not
switching. The current limit values in operation will be somewhat higher
due to the propagation delay of the comparators.
Note 4: The LTC3521 is tested in a proprietary test mode that connects
each FB pin to the output of the respective error amplifier.
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 impair device reliability.
Note 6: Shutdown current is measured on the VIN pin and does not include
PMOS switch leakage.
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Buck-Boost Efficiency vs Load
Current, Li-Ion to 3.3V
100
VIN = 2.7V PWM MODE
140
90
VIN = 4.2V
120
80
70
100
60
80
50
Burst Mode
40 OPERATION
60
30
40
20
10
0
0.1
Burst Mode
20
POWER LOSS
0
1
10
100
1000
LOAD CURRENT (mA)
3521 G01
Buck Efficiency vs Load Current,
Li-Ion to 1.8V
100
VIN = 2.7V
90
VIN = 4.2V
80 Burst Mode
OPERATION
70
140
PWM MODE 120
100
60
80
50
40
60
30
Burst Mode
40
20
POWER LOSS
20
10
0
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
3521 G03
Buck Efficiency vs Load Current,
Li-Ion to 2.5V
100
VIN = 3.6V
90
VIN = 4.2V
80
Burst Mode
70
OPERATION
140
PWM MODE 120
100
60
80
50
40
60
30
Burst Mode
40
20
POWER LOSS
20
10
0
0.1
1
0
10
100
1000
LOAD CURRENT (mA)
3521 G02
Buck Burst Mode Current
Threshold vs VIN
60
50
VOUT = 1.2V
40
30
20 VOUT = 1.8V
10 VOUT = 2.5V
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
3521 G04
3521fb
4
For more information www.linear.com/LTC3521
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