LTC1730-4.2_15 Datasheet, PDF (4/12 Pages) Linear Technology – Lithium-Ion Battery Pulse Charger with Overcurrent Protection

LTC1730-4/LTC1730-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Current vs Input
Supply Voltage
50
TA = 25°C
45
40
35
30
25
Trickle Charge Threshold Voltage
vs Temperature
2.50
V_CC = 6V
2.48
2.46
2.44
2.42
Trickle Charge Current vs
Temperature
50
V_CC = 6V
45
40
35
30
25
20
56
7 8 9 10 11 12
V_CC (V)
1730 G01
2.40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1730 G02
20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1730 G03
Internal Switch On-Resistance vs
Temperature
0.50
V_BAT = 4V
0.45
0.40
0.35
0.30
0.25
Timer Accuracy vs Temperature
115
V_CC = 6V
110 ^{CTIMER = 0.1µF}
105
100
95
90
85
Overcurrent vs Temperature
1.3
V_CC = 6V
1.2 ^{RSEN = 0.1Ω}
1.1
1.0
0.9
0.8
0.7
0.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1730 G05
80
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1730 G06
0.6
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1730 G07
Battery Recharge Threshold Offset
from V_BAT vs Temperature
300
V_CC = 6V
250
200
150
100
50
CHRG Pin Output Low Voltage vs
Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
4
0
–50 –25 0
25 50 75 100 125 150
TEMPERATURE (°C)
1730 G09
0.3
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1730 G08
sn1730 1730fs