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| 型号： | MAX8900DEWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/35页 |
| 文件大小： | 0K |
| 描述： | IC LI BATTERY CHARGER 1.2A WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 3.4 V ~ 6.3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 30-WFBGA，WLBGA |
| 供应商设备封装： | 30-WLP |
| 包装： | 带卷 (TR) |
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MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
Setting the Prequalification Current
and Done Threshold (DNI)
As shown in Figure 5, a resistor from DNI to ground
(R DNI ) sets the prequalification current (I PQ ) and done
current (I DN ). The MAX8900_ supports values of R DNI
from 1.19k I to 38.2k I . Select R DNI as follows:
Depending on its mode of operation, the MAX8900_ controls
the voltage at DNI from 0 to 1.5V. Avoid adding capacitance
directly to the SETI pin that exceeds 10pF.
As shown in Figure 10, the prequalification current and
done threshold is set to 50% of programmed value when
T1 < THM < T2, and 100% of programmed value when
I DN = 384V/R DNI
I PQ = 415V/R DNI
T2 < THM < T4.
Determine the optimal I PQ and I DN for a given system by
considering the characteristics of the battery.
As a protection feature, if the battery temperature is
between the T2 and T4 thresholds and DNI is shorted
to ground, then the MAX8900_ latches off the battery
charger and enters the timer fault state. This protection
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
FAST-CHARGE CURRENT
vs. R SETI
feature is disabled inside of dead-battery mode and
thermal foldback. Furthermore, if DNI is unconnected,
then the prequalification and done current is 0A and the
charge timer prevents the MAX8900_ from indefinitely
operating in its done state.
Charge Enable Input ( CEN )
CEN is a digital input. Driving CEN high disables the
battery charger. Pull CEN low or leave it unconnected
PREQUALIFICATION AND DONE CURRENT
vs. R DNI
250
0
20
40
60
80
R SETI (k I )
200
R SETI
(k I )
2.87
3.01
3.16
3.32
I FC
(A)
1.186
1.131
1.078
1.026
R SETI
(k I )
7.15
7.32
7.87
8.25
I FC
(A)
0.476
0.465
0.433
0.413
R SETI
(k I )
24.9
27.4
30.1
32.2
I FC
(A)
0.137
0.124
0.113
0.106
150
100
50
I DN
I PQ
3.57
3.92
4.12
4.32
4.42
4.75
4.99
5.11
5.62
6.19
6.81
7.5
0.954
0.869
0.826
0.788
0.770
0.717
0.682
0.666
0.606
0.550
0.500
0.454
9.09
10.0
11.0
12.1
13.0
14.0
15.0
16.2
18.2
20.0
22.1
24.3
0.375
0.341
0.310
0.281
0.262
0.243
0.227
0.210
0.187
0.170
0.154
0.140
34.0
35.7
39.2
43.2
45.5
49.9
51.1
56.2
61.9
66.5
68.1
0.100
0.095
0.087
0.079
0.075
0.068
0.067
0.061
0.055
0.051
0.050
R DNI
(k I )
1.91
2.37
3.48
3.57
3.83
4.42
5.9
7.32
0
0
I PQ
(mA)
217.3
175.1
119.3
116.2
108.4
93.9
70.3
56.7
I DN
(mA)
201.0
162.0
110.3
107.6
100.3
86.9
65.1
52.5
10
R DNI (k I )
R DNI
(k I )
7.5
7.68
7.87
10.0
14.3
20.0
28.0
39.2
I PQ
(mA)
55.3
54.0
52.7
41.5
29.0
20.8
14.8
10.6
100
I DN
(mA)
51.2
50.0
48.8
38.4
26.9
19.2
13.7
9.8
Figure 4. Fast-Charge Current vs. R SETI ( www.maxim-ic.com/
tools/other/software/MAX8900-RSETI.XLS )
18
Figure 5. Prequalification Current and Done Threshold vs. R DNI
( www.maxim-ic.com/tools/other/software/MAX8900-DNI.XLS )
Maxim Integrated
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