参数资料
型号: LTC4098EUDC#TRPBF
厂商: Linear Technology
文件页数: 25/32页
文件大小: 0K
描述: IC CHARGER USB COMP 20-UTQFN
标准包装: 2,500
系列: Bat-Track™, PowerPath™
功能: 电源管理
电池化学: 锂离子(Li-Ion)、锂聚合物(Li-Pol)
电源电压: 4.35 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-WFQFN 裸露焊盘
供应商设备封装: 20-QFN-EP(3x4)
包装: 带卷 (TR)
LTC4098/LTC4098-1
APPLICATIONS INFORMATION
R NOM =
r HOT
R NOM = COLD
r – r HOT
By using a bias resistor, R NOM , different in value from
R25, the hot and cold trip points can be moved in either
direction. The temperature span will change somewhat due
to the nonlinear behavior of the thermistor. The following
equations can be used to easily calculate a new value for
the bias resistor:
? R25
0.536
perature gain of the thermistor as absolute temperature
increases.
The upper and lower temperature trip points can be inde-
pendently programmed by using an additional bias resistor
as shown in Figure 9b. The following formulas can be used
to compute the values of R NOM and R1:
? R25
2.714
R NOM =
r COLD
3.25
? R25
R1 = 0.536 ? R NOM – r HOT ? R25
where r HOT and r COLD are the resistance ratios at the
desired hot and cold trip points. Note that these equations
For example, to set the trip points to 0°C and 45°C with
a Vishay Curve 1 thermistor choose:
are linked. Therefore, only one of the two trip points can
be chosen, the other is determined by the default ratios
designed in the IC. Consider an example where a 60°C
R NOM =
3.266 – 0.4368
2.714
? 100k = 104.2k
hot trip point is desired.
From the Vishay curve 1 R-T characteristics, r HOT is 0.2488
at 60°C. Using the previous equation, R NOM should be set
to 46.4k. With this value of R NOM , the cold trip point is
about 16°C. Notice that the span is now 44°C rather than
the previous 40°C. This is due to the decrease in tem-
the nearest 1% value is 105k:
R1 = 0.536 ? 105k – 0.4368 ? 100k = 12.6k
the nearest 1% value is 12.7k. The final circuit is shown
in Figure 9b and results in an upper trip point of 45°C and
a lower trip point of 0°C.
NTCBIAS
4
LTC4098/LTC4098-1
NTC BLOCK
NTCBIAS
4
LTC4098/LTC4098-1
NTC BLOCK
R NOM
100k
NTC
5
0.765 ? NTCBIAS
+
TOO_COLD
R NOM
105k
NTC
5
0.765 ? NTCBIAS
+
TOO_COLD
T
R NTC
100k
R1
12.7k
TOO_HOT
TOO_HOT
0.349 ? NTCBIAS
+
T
R NTC
100k
0.349 ? NTCBIAS
+
+
NTC_ENABLE
+
NTC_ENABLE
0.1V
(9a)
40981 F09a
0.1V
(9b)
40981 F09b
Figure 9. NTC Circuits
40981fc
25
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