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| LTC3550-1_15 Datasheet, PDF (5/24 Pages) Linear Technology – Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter | |||
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LTC3550-1
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Regulated Charger Output (Float)
Voltage vs Charge Current
4.26
VDCIN = VUSBIN = 5V
4.24
4.22
4.20
4.18
4.16
RIDC = RIUSB = 2k RIDC = 1.25k
4.14
4.12
4.10
0
100 200 300 400 500 600 700 800
CHARGE CURRENT (mA)
3550-1 G01
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
1.008
1.006
1.004
1.002
1.000
0.998
VUSBIN = 8V
VUSBIN = 4.3V
0.996
0.994
0.992
â50
â25 0 25 50
TEMPERATURE (°C)
75 100
3550-1 G04
Regulated Charger Output (Float)
Voltage vs Temperature
4.220
4.215
VDCIN = VUSBIN = 5V
4.210
4.205
4.200
4.195
4.190
4.185
4.180
â50
â25 0 25 50
TEMPERATURE (°C)
75 100
3550-1 G02
Charge Current vs IDC Pin Voltage
900
VDCIN = 5V
800
700
RIDC = 1.25k
600
RIDC = 2k
500
400
300
200
RIDC = 10k
100
0
0 0.2 0.4 0.6 0.8 1.0 1.2
VIDC (V)
3550-1 G05
IDC Pin Voltage vs Temperature
(Constant-Current Mode)
1.008
1.006
1.004
1.002
1.000
0.998
VDCIN = 8V
VDCIN = 4.3V
0.996
0.994
0.992
â50
â25 0 25 50
TEMPERATURE (°C)
75 100
3550-1 G03
Charge Current
vs IUSB Pin Voltage
900
VUSBIN = 5V
800
700
RIUSB = 1.25k
600
RIUSB = 2k
500
400
300
200
RIUSB = 10k
100
0
0 0.2 0.4 0.6 0.8 1.0 1.2
VIUSB (V)
3550-1 G06
â¯Pâ¯Wâ¯R Pin I-V Curve
35
VDCIN = VUSBIN = 5V
30
25
20
TA = â 40°C
TA = 25°C
TA = 90°C
15
10
5
0
01
2 34 5
VPWR (V)
67
3550-1 G07
â¯Câ¯Hâ¯Râ¯G Pin I-V Curve
35
VDCIN = VUSBIN = 5V
30
25
20
TA = â 40°C
TA = 25°C
TA = 90°C
15
10
5
0
01
2 34 5
VCHRG (V)
67
3550-1 G08
USBPWR Pin I-V Curve
6
VDCIN = 5V
VUSBIN = 0V
5
4
TA = â 40°C
TA = 25°C
TA = 90°C
3
2
1
0
01
2 34 5
VUSBPWR (V)
67
3550-1 G09
35501f
5
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