LTC3550 Linear Technology, LTC3550 Datasheet - Page 8

• Manufacturer Part Number: LTC3550
• Description: Dual Input USB/AC Adapter Li-Ion Battery Charger
• Manufacturer: Linear Technology

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LTC3550
TYPICAL PERFOR A CE CHARACTERISTICS
8
100
1.8
1.7
1.6
1.5
1.4
1.3
1.2
0.7
0.6
0.4
0.3
0.2
0.5
0.1
95
90
85
80
75
70
65
60
0
–50
0.1
2
Buck Regulator Effi ciency
vs Output Current
Oscillator Frequency vs V
Buck Regulator Switches R
vs Temperature
V
V
CC
OUT
–25
= 2.7V
= 2.5V
MAIN SWITCH
SYNCHRONOUS SWITCH
V
V
CC
CC
1
OUTPUT CURRENT (mA)
3
= 4.2V
0
= 4.2V
TEMPERATURE (°C)
V
CC
25
V
V
CC
= 3.6V
10
CC
4
(V)
50
= 3.6V
V
CC
= 2.7V
75
100
W
5
CC
DS(0N)
100
3550 G29
3550 G26
3550 G32
U
1000
125
6
1.844
1.834
1.824
1.814
1.804
1.794
1.784
0.614
0.609
0.604
0.599
0.594
0.589
0.584
1.774
50
45
40
35
30
25
20
15
10
5
0
–50
0
2
Buck Regulator Reference
Voltage vs Temperature
Buck Regulator Output Voltage
vs Load Current
Buck Regulator Supply
Current vs V
V
V
I
V
LOAD
CC
OUT
CC
100
–25
= 3.6V
= 3.6V
= 1.875V
= 0A
200 300 400 500 600 700 800
3
LOAD CURRENT (mA)
0
TEMPERATURE (°C)
CC
25
V
CC
4
(V)
50
75
5
100
3550 G30
T
3550 G33
3550 G27
A
125
= 25°C, unless otherwise noted.
900
6
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
0.7
0.4
0.6
0.5
0.3
0.2
0.1
50
45
40
35
30
25
20
15
10
0
5
0
–50
–50
0
R
Oscillator Frequency
vs Temperature
Buck Regulator Supply Current
vs Temperature
V
V
I
V
LOAD
DS(ON)
CC
OUT
CC
–25
–25
= 3.6V
= 3.6V
1
= 1.875V
= 0A
vs V
2
0
0
SYNCHRONOUS
TEMPERATURE (°C)
TEMPERATURE (°C)
CC
SWITCH
25
25
3
V
CC
MAIN
SWITCH
(V)
50
50
4
75
75
5
100
100
6
3550 G34
3550 G31
3550 G28
3550fa
125
125
7