参数资料
| 型号： | LTC4085EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 14-DFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 带卷 (TR) |
LTC4085
APPLICATIONS INFORMATION
V NTC
9
LTC4085
V NTC
9
LTC4085
R NOM
10k
NTC
8
0.74 ? V NTC
–
+
TOO_COLD
R NOM
121k
NTC
8
0.74 ? V NTC
–
+
TOO_COLD
R NTC
R1
10k
–
TOO_HOT
13.3k
–
TOO_HOT
0.29 ? V NTC
+
R NTC
100k
0.29 ? V NTC
+
+
NTC_ENABLE
+
NTC_ENABLE
0.1V
–
(4a)
4085 F04a
Figure 4. NTC Circuits
0.1V
–
(4b)
4085 F04b
Thermistors
The LTC4085 NTC trip points were designed to work
R NOM =
R COLD
2.815
? R NTC at 25 ° C
R NOM =
? R NTC at 25 ° C
with thermistors whose resistance-temperature charac-
teristics follow Vishay Dale’s “R-T Curve 2”. The Vishay
NTHS0603N02N1002J is an example of such a thermis-
tor. However, Vishay Dale has many thermistor products
that follow the “R-T Curve 2” characteristic in a variety of
sizes. Furthermore, any thermistor whose ratio of R COLD
to R HOT is about 7.0 will also work (Vishay Dale R-T Curve
2 shows a ratio of R COLD to R HOT of 2.815/0.4086 = 6.89).
Power conscious designs may want to use thermistors
whose room temperature value is greater than 10k. Vishay
Dale has a number of values of thermistor from 10k to
100k that follow the “R-T Curve 2”. Using these as indi-
cated in the NTC Thermistor section will give temperature
trip points of approximately 3°C and 47°C, a delta of
where R COLD is the resistance ratio of R NTC at the desired
cold temperature trip point. If you want to shift the trip
points to higher temperatures use the following equation:
R HOT
0.4086
where R HOT is the resistance ratio of R NTC at the desired
hot temperature trip point.
Here is an example using a 100k R-T Curve 1 thermistor
from Vishay Dale. The difference between the trip points
is 44°C, from before, and we want the cold trip point to
be 0°C, which would put the hot trip point at 44°C. The
R NOM needed is calculated as follows:
44°C. This delta in temperature can be moved in either
direction by changing the value of R NOM with respect to
R NTC . Increasing R NOM will move both trip points to lower
temperatures. Likewise a decrease in R NOM with respect
to R NTC will move the trip points to higher temperatures.
R NOM =
=
R COLD
2.815
3.266
2.815
? R NTC at 25 ° C
? 100k = 116k
To calculate R NOM for a shift to lower temperature for
example, use the following equation:
4085fd
19
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