LTC3550-1 Linear Technology, LTC3550-1 Datasheet - Page 7

• Manufacturer Part Number: LTC3550-1
• Description: Dual Input USB/AC Adapter Li-Ion Battery Charger
• Manufacturer: Linear Technology

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500mA/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
ENABLE
5V/DIV
1.91
1.90
1.89
1.88
1.87
1.86
1.85
1.84
4.25
4.20
4.15
4.10
4.05
4.00
3.95
3.90
3.85
I
BAT
–50
–50
Undervoltage Lockout Threshold
vs Temperature
Charge Current During Turn-On
and Turn-Off
Buck Regulator Output Voltage
vs Temperature
V
R
V
I
DCIN
IDC
OUT
CC
–25
= 1.25k
= 3.6V
–25
= 5V
= 100mA
0
USBIN UVLO
TEMPERATURE (°C)
TEMPERATURE (°C)
0
DCIN UVLO
100µs/DIV
25
25
50
50
75
W
75
100
3550-1 G22
3550-1 G19
3550-1 G25
U
125
100
4.16
4.14
4.12
4.10
4.08
4.06
4.04
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
100
95
90
85
80
75
70
–50
–50
Recharge Threshold Voltage
vs Temperature
Buck Regulator Effi ciency vs V
Oscillator Frequency
vs Temperature
2
V
CC
–25
= 3.6V
–25
I
I
I
OUT
OUT
OUT
= 100mA
= 10mA
V
= 600mA
3
DCIN
0
TEMPERATURE (°C)
TEMPERATURE (°C)
V
0
DCIN
= V
25
V
= V
USBIN
CC
25
4
USBIN
(V)
50
= 4.3V
= 8V
50
75
5
75
100
3550-1 G20
35501 G23
3550-1 G26
CC
T
A
100
125
= 25°C, unless otherwise noted.
6
100
1.8
1.7
1.6
1.5
1.4
1.3
1.2
–1
90
80
70
60
50
5
4
3
2
1
0
–50
0.1
Battery Drain Current
vs Temperature
Buck Regulator Effi ciency
vs Output Current
Oscillator Frequency vs V
2
V
V
BAT
DCIN
–25
= 4.2V
, V
USBIN
V
CC
1
3
TEMPERATURE (°C)
= 3.6V
0
(NOT CONNECTED)
LTC3550-1
I
LOAD
V
CC
25
10
4
(mA)
(V)
V
V
CC
CC
50
= 4.2V
= 2.7V
100
CC
5
75
3550-1 G21
3550-1 G27
35501 G24
35501f
7
1000
100
6