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| 型号： | MAX8671XETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 40/44页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/CHARGER 40-TQFN-EP |
| 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： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Table 8. Trip Temperatures for Different Thermistors
THERMISTOR BETA (? [K])
R TB (k Ω )
R TP (k Ω )
R TS (k Ω )
Resistance at +25°C [k Ω ]
Resistance at +50°C [k Ω ]
Resistance at 0°C [k Ω ]
Nominal Hot Trip
Temperature [°C]
Nominal Cold Trip
Temperature [°C]
3000
10
Open
Short
10
4.59
25.14
55
-3
3250
10
Open
Short
10
4.30
27.15
53
-1
3500
10
Open
Short
10
4.03
29.32
51
0
3750
10
Open
Short
10
3.78
31.66
49
2
4250
10
Open
Short
10
3.32
36.91
46
5
4250
10
120
Short
10
3.32
36.91
45
0
VL
CEN
R TB
ALTERNATE THERMISTOR
CONFIGURATION
THM
0.74 x VL
COLD
TEMPERATURE
SUSPEND
HOT
R TS
0.284 x VL
R TP
T
ESD
DIODE
T
Figure 14. Thermistor Input
AGND
BOTH COMPARATORS
HAVE 65mV HYSTERESIS
MAX8671X
Since the thermistor monitoring circuit employs an
external bias resistor from THM to VL (R TB in Figure
14), any resistance thermistor can be used as long as
the value of R TB is equivalent to the thermistor’s +25°C
resistance. For example, with a 10k Ω at +25°C thermis-
tor, use 10k Ω at R TB , and with a 100k Ω at +25°C ther-
mistor, use 100k Ω at R TB . The general relation of
thermistor resistance to temperature is defined by the
following equation:
where:
R T = The resistance in ohms of the thermistor at tem-
perature T in Celsius
R 25 = The resistance in ohms of the thermistor at
+25°C
β = The material constant of the thermistor that typically
ranges from 3000K to 5000K
T = The temperature of the thermistor in °C that corre-
R T = R 25 × e ? β ?
? T + 273
1 ? ?
298 ? ?
? ? 1
?
?
? ?
sponds to R T
40
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相关代理商/技术参数 |
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|---|---|
| MAX8672ETD+T | 功能描述:电池管理 Backup Management IC for NiMH Batteries RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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| MAX8676ELB+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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