Datasheet

4
LTC4068-4.2/LTC4068X-4.2
406842fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Regulated Output (Float) Voltage
vs Charge Current
I
BAT
(mA)
0
V
FLOAT
(V)
4.24
300
405842 G04
4.18
4.14
100 200 400
4.12
4.10
4.26
4.22
4.20
4.16
500 600 700
V
CC
= 5V
T
A
= 25°C
R
PROG
= 1.25k
Regulated Output (Float) Voltage
vs Temperature
TEMPERATURE (°C)
–50
4.185
V
FLOAT
(V)
4.190
4.195
4.200
4.205
4.215
–25
02550
405842 G05
75 100
4.210
V
CC
= 5V
R
PROG
= 10k
Regulated Output (Float) Voltage
vs Supply Voltage
V
CC
(V)
4
4.185
V
FLOAT
(V)
4.190
4.195
4.200
4.205
4.215
4.5
5 5.5 6
405842 G06
6.5 7
4.210
T
A
= 25°C
R
PROG
= 10k
CHRG Pin I-V Curve
(Pull-Down State)
Trickle Charge Current
vs Temperature
ACPR Pin I-V Curve
(Pull-Down State)
V
CHRG
(V)
0
I
CHRG
(mA)
20
25
30
35
405842 G07
15
10
12
467
5
0
T
A
= –40°C
T
A
= 25°C
T
A
= 90°C
V
CC
= 5V
V
BAT
= 4V
V
ACPR
(V)
0
I
ACPR
(mA)
20
25
30
35
405842 G08
15
10
12
467
5
0
T
A
= –40°C
T
A
= 25°C
T
A
= 90°C
V
CC
= 5V
V
BAT
= 4V
TEMPERATURE (°C)
–50
0
I
TRKL
(mA)
10
20
30
40
60
–25
02550
405842 G09
75 100
50
V
CC
= 5V
V
BAT
= 2.5V
R
PROG
= 2k
LTC4068 ONLY
R
PROG
= 10k
Trickle Charge Current
vs Supply Voltage Charge Current vs Battery Voltage
V
CC
(V)
4
0
I
TRKL
(mA)
10
20
30
40
60
4.5
5 5.5 6
405842 G10
6.5 7
50
V
BAT
= 2.5V
T
A
= 25°C
R
PROG
= 2k
R
PROG
= 10k
LTC4068 ONLY
Trickle Charge Threshold Voltage
vs Temperature
TEMPERATURE (°C)
–50
V
TRKL
(V)
2.875
2.900
2.925
25
75
405842 G11
2.850
2.825
2.800
–25 0 50
2.950
2.975
3.000
100
V
CC
= 5V
R
PROG
= 10k
LTC4068 ONLY
V
BAT
(V)
2.4
I
BAT
(mA)
400
500
600
3.3 3.9
405842 G12
300
200
2.7 3
3.6 4.2 4.5
100
0
V
CC
= 5V
θ
JA
= 40°C/W
R
PROG
= 2k
LTC4068 ONLY