LT1513/LT1513-2
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
Switch Current Limit
vs Duty Cycle
Minimum Input Voltage
vs Temperature
6
5
4
3
2
1
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3.0
2.8
2.6
2.4
2.2
2.0
1.8
150°C
100°C
25°C
25°C AND
125°C
–55°C
–55°C
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
75 100
TEMPERATURE (°C)
0
–50 –25
0
25 50
125 150
0
0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
SWITCH CURRENT (A)
LT1513 • G02
LT1513 • G03
LT1513 • G01
Output Charging Characteristics
Showing Constant-Current and
Constant-Voltage Operation
Negative Feedback Input Current
vs Temperature
12
10
8
0
–10
–20
–30
–40
–50
MAXIMUM AVAILABLE
CHARGING CURRENT
WITH 12V INPUT
V
= 12V
IN
(A) 8.4V BATTERY
= 0.5A
(A)
(B)
I
CHRG
6
(B) 8.4V BATTERY
= 1A
I
CHRG
(C) 4.2V BATTERY
= 1.5A
4
I
CHRG
(C)
2
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
CHARGING CURRENT (A)
–50
50
100 125
150
–25
0
25
75
TEMPERATURE (°C)
1513 G07
LT1513 • G06
Feedback Input Current
vs Temperature
Minimum Peak-to-Peak
Synchronization Voltage vs Temperature
800
700
600
500
400
300
200
100
0
3.0
2.5
2.0
1.5
1.0
0.5
0
f
= 700kHz
SYNC
V
= V
REF
FB
50 75
25
TEMPERATURE (°C)
–50 –25
0
100 125 150
75 100
–50 –25
0
25 50
125 150
TEMPERATURE (°C)
LT1513 • G05
LT1513 • G04
4
Linear [ Linear ]
