LTC3550 Linear Technology, LTC3550 Datasheet - Page 7

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

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TYPICAL PERFOR A CE CHARACTERISTICS
4.16
4.14
4.12
4.10
4.08
4.06
4.04
100
2.8
2.6
2.4
2.2
2.0
1.8
1.6
80
50
95
90
85
75
70
65
60
55
–50
–50
2
Recharge Threshold Voltage
vs Temperature
Buck Regulator Effi ciency
vs V
HPWR Pin Pull-Down Resistance
vs Temperature
V
I
OUT
OUT
I
–25
OUT
CC
–25
= 1mA
= 1.8V
= 100mA
3
V
DCIN
TEMPERATURE (°C)
TEMPERATURE (°C)
V
0
0
DCIN
I
OUT
I
= V
OUT
V
= V
= 600mA
CC
USBIN
25
25
= 0.1mA
4
USBIN
(V)
= 4.3V
= 8V
50
50
I
OUT
W
5
= 10mA
75
75
3550 G20
3550 G23
3550 G45
U
100
100
6
2.8
2.6
2.4
2.2
2.0
1.8
1.6
–1
95
90
85
80
75
70
65
60
5
4
3
2
1
0
–50
–50
0.1
Battery Drain Current
vs Temperature
EN Pin Pull-Down Resistance
vs Temperature
Buck Regulator Effi ciency
vs Output Current
V
V
V
BAT
DCIN
OUT
–25
–25
= 4.2V
, V
= 1.8V
USBIN
1
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
V
0
0
V
(NOT CONNECTED)
CC
CC
CC
= 2.7V
= 3.6V
= 4.2V
25
25
10
50
50
100
75
75
3550 G18
3550 G21
3550 G24
T
A
1000
100
100
= 25°C, unless otherwise noted.
500mA/DIV
ENABLE
5V/DIV
4.25
4.20
4.15
4.10
4.05
4.00
3.95
3.90
3.85
I
BAT
95
90
85
80
75
70
65
60
–50
0.1
Undervoltage Lockout Threshold
vs Temperature
Charge Current During Turn-On
and Turn-Off
V
R
Buck Regulator Effi ciency
vs Output Current
V
DCIN
IDC
V
OUT
CC
= 1.25k
= 2.7V
–25
= 1.5V
= 5V
1
OUTPUT CURRENT (mA)
V
CC
USBIN UVLO
V
TEMPERATURE (°C)
CC
0
= 3.6V
= 4.2V
DCIN UVLO
100µs/DIV
10
LTC3550
25
50
100
75
3550 G22
3550 G25
3550 G19
3550fa
7
1000
100