Datasheet

11Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 6V, V
BAT
= 3.6V, T
A
= +25NC, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
(CONSTANT-CURRENT MODE)
V
IN
(V)
EFFICIENCY (%)
986 7
76
78
80
82
86
84
88
90
74
51
0
MAX8900A toc23
I
BAT
= 1200mA, R
SETI
= 2.87kI
V
BAT
= 4.0V
V
BAT
= 3.6V
V
BAT
= 3.0V
EFFICIENCY vs. CHARGE CURRENT
(CONSTANT-VOLTAGE MODE)
MAX8900A toc24
I
BAT
(A)
EFFICIENCY (%)
1000500
75
80
85
90
95
100
70
0 1500
V
IN
= 5V, V
BAT
= 4.2V
BATTERY + LX LEAKAGE CURRENT
vs. INPUT VOLTAGE
MAX8900A toc25
INPUT VOLTAGE (V)
BATTERY LEAKAGE CURRENT (nA)
1234
100
1000
10
05
CEN = 1
V
BAT
= 4.0V
V
BAT
= 3.2V
BATTERY VOLTAGE (V)
BATTERY LEAKAGE CURRENT (nA)
54321
5
10
15
20
25
30
35
40
45
50
0
06
BATTERY + LX LEAKAGE CURRENT
vs. BATTERY VOLTAGE
MAX8900A toc26
IN UNCONNECTED
STAT INDICATOR CURRENT
NOT INCLUDED
BATTERY + LX LEAKAGE CURRENT
vs. AMBIENT TEMPERATURE
MAX8900A toc27
TEMPERATURE (°C)
BATTERY LEAKAGE CURRENT (nA)
603510-15
10
20
30
40
50
60
0
-40 85
IN UNCONNECTED
STAT INDICATOR CURRENT
NOT INCLUDED
AVL VOLTAGE vs. INPUT VOLTAGE
MAX8900A toc28
V
IN
(V)
V
AVL
(V)
252015105
1
2
3
4
5
6
0
03
0
MAX8900x
V
OVLO
= 28V
V
CEN
= 0V
V
BAT
= 3.6V
R
SETI
= 2.87kI
V
OVLO
MAX8900_ CHARGE PROFILE
(CONSTANT-CURRENT TO DONE MODES)
MAX8900A toc29
TIME (s)
VOLTAGE (V)
BATTERY CURRENT (A)
8500650045002500
3.7
3.8
3.9
4.0
4.1
4.2
4.3
3.6
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
500 10,500
V
IN
= 5V
R
SETI
= 4.02kI
R
DNI
= 3.57kI
C
CT
= 0.47µF
1300mAh BATTERY
CC DONECV
V
BAT
I
BAT
I
IN
MAX8900_ CHARGE PROFILE
(CHARGER RESTART)
MAX8900A toc30
TIME (s)
VOLTAGE (V)
BATTERY CURRENT (A)
8000600040002000
3.7
3.8
3.9
4.0
4.1
4.2
4.3
3.6
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
0 10,000
V
IN
= 5V
R
SETI
= 4.02kI
R
DNI
= 3.57kI
C
CT
= 0.47µF
1300mAh BATTERY
DONE DONECV
V
BAT
I
BAT
I
IN