MAX8900BEWV+T Maxim Integrated Products, MAX8900BEWV+T Datasheet - Page 18

• Manufacturer Part Number: MAX8900BEWV+T
• Description: IC LI-ION/POLY BATT CHRGR 30WLP
• Manufacturer: Maxim Integrated Products

Specifications of MAX8900BEWV+T

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 3.4 V ~ 8.7 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 30-WLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4. Fast-Charge Current vs. R
tools/other/software/MAX8900-RSETI.XLS)
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
As shown in Figure 5, a resistor from DNI to ground
(R
current (I
from 1.19kI to 38.2kI. Select R
Determine the optimal I
considering the characteristics of the battery.
18
DNI
I
DN
R
(kI)
2.87
3.01
3.16
3.32
3.57
3.92
4.12
4.32
4.42
4.75
4.99
5.11
5.62
6.19
6.81
) sets the prequalification current (I
7.5
SETI
= 384V/R
DN
Setting the Prequalification Current
). The MAX8900_ supports values of R
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.186
1.131
1.078
1.026
0.954
0.869
0.826
0.788
0.770
0.717
0.682
0.666
0.606
0.550
0.500
0.454
I
0
(A)
FC
0
DNI
R
FAST-CHARGE CURRENT
(kI)
7.15
7.32
7.87
8.25
9.09
10.0
11.0
12.1
13.0
14.0
15.0
16.2
18.2
20.0
22.1
24.3
SETI
20
PQ
and Done Threshold (DNI)
and I
vs. R
R
SETI
0.476
0.465
0.433
0.413
0.375
0.341
0.310
0.281
0.262
0.243
0.227
0.210
0.187
0.170
0.154
0.140
40
I
(A)
(kI)
SETI
DN
FC
SETI
DNI
I
PQ
for a given system by
(www.maxim-ic.com/
as follows:
60
= 415V/R
R
(kI)
24.9
27.4
30.1
32.2
34.0
35.7
39.2
43.2
45.5
49.9
51.1
56.2
61.9
66.5
68.1
SETI
PQ
) and done
80
0.137
0.124
0.113
0.106
0.100
0.095
0.087
0.079
0.075
0.068
0.067
0.061
0.055
0.051
0.050
DNI
I
(A)
FC
DNI
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
T2 < THM < T4.
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
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.
CEN is a digital input. Driving CEN high disables the
battery charger. Pull CEN low or leave it unconnected
Figure 5. Prequalification Current and Done Threshold vs. R
(www.maxim-ic.com/tools/other/software/MAX8900-DNI.XLS)
R
(kI)
1.91
2.37
3.48
3.57
3.83
4.42
7.32
5.9
DNI
250
200
150
100
50
0
217.3
175.1
119.3
116.2
108.4
(mA)
93.9
70.3
56.7
I
PQ
PREQUALIFICATION AND DONE CURRENT
0
I
DN
201.0
162.0
110.3
107.6
100.3
(mA)
86.9
65.1
52.5
Charge Enable Input (CEN)
I
DN
I
PQ
vs. R
R
DNI
10
(kI)
R
(kI)
DNI
7.68
7.87
10.0
14.3
20.0
28.0
39.2
7.5
DNI
(mA)
55.3
54.0
52.7
41.5
29.0
20.8
14.8
10.6
I
PQ
100
(mA)
51.2
50.0
48.8
38.4
26.9
19.2
13.7
I
9.8
DN
DNI