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| 型号： | MAX8900DEWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/35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
Table 1. 2.44mm x 2.67mm x
0.64mm, 0.4mm Pitch WLP Thermal
Characteristics
If the thermistor functionality is not required, connect a
1M I resistor from THM to AVL and another 1M I resis-
tor from THM to GND. This biases the THM node to be
? of the AVL voltage telling the MAX8900_ that the bat-
Continuous Power
Dissipation
B JA
B JC
Board Parameters
FOUR-LAYER PCB
(JESD51-9:2s2p)
1619mW
Derate 20.2mW/ N C above
+70 N C/W
49.4 N C/W
9 N C/W
? Still air
? 4-layer board
? 1.5oz copper on outer layers
? 1oz copper on inner layers
? 1.6mm thick board (62mil)
? 4in x 4in board
? Four center thermal vias
? FR-4
tery temperature is between the T2 and T3 temperature
range. Furthermore, the high 2M I impedance presents
a minimal load to AVL.
Table 2 shows that the MAX8900_ is compatible with
several standard thermistor values. When using a 10k I
thermistor with a beta of 3380K, the configuration of
Figure 11A provides for temperature trip thresholds that
are very close to the nominal T1, T2, T3, and T4 (see the
Electrical Characteristics table). When using alternate
resistance and/or beta thermistors, the circuit of Figure
11A may result in temperature trip thresholds that are
different from the nominal values. In this case, the circuit
of Figure 11B allows for compensating the thermistor to
shift the temperature trip thresholds back to the nomi-
nal value. In general, smaller values of R TP shift all the
temperature trip thresholds down; however, the lower
several thermal management techniques to prevent
excessive battery and die temperatures.
Thermistor Monitor (THM)
The MAX8900_ adjusts the charge current and termina-
tion voltage as described in the JEITA specification for
safe use of secondary Li+ batteries ( A Guide to the Safe
Use of Secondary Lithium Ion Batteries in Notebook-type
Personal Computers, April 20, 2007 ). As shown in Figure
10, there are four temperature thresholds that change
the battery charger operation: T1, T2, T3, and T4. When
temperature thresholds are affected more then the higher
temperature thresholds. Furthermore, larger values of R TS
shift all the temperature trip thresholds up; however, the
higher temperature thresholds are affected more than the
lower temperature thresholds. For assistance with therm-
istor calculations, use the spreadsheet at the following
The general relation of thermistor resistance to tempera-
ture is defined by the following equation:
? β ?
? ? 1 1 ? ?
? ?
xe ?
the thermistor input exceeds the extreme temperatures
(< T1 or > T4), the charger shuts off and all respective
charging timers are suspended. While the thermistor
R THRM = R 25
-
? T + 273 N C 298 N C ? ?
remains out of range, no charging occurs, and the timer
counters hold their state. When the thermistor input
comes back into range, the charge timers continue to
count. The middle thresholds (T2 and T3) do not shut
the charger off, but adjust the current/voltage targets
to maximize charging while reducing battery stress.
Between T3 and T4, the voltage target is reduced (see
V BATREG in the Electrical Characteristics table); how-
ever, the charge timers continue to count. Between T1
and T2, the charging current target is reduced to 50%
of its normal operating value; and similarly the charge
timers continue to count.
24
where:
R THRM = The resistance in I of the thermistor at tem-
perature T in Celsius.
R 25 = The resistance in I of the thermistor at T A =
+25 N C.
? = The material constant of the thermistor, which
typically ranges from 3000K to 5000K.
T = The temperature of the thermistor in N C.
Maxim Integrated
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