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参数资料
| 型号： | LTC4069EDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION 6-DFN |
| 标准包装： | 500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 3.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
LTC4069
APPLICATIONS INFORMATION
R NOM =
? R NTC at 25 ° C
? 10k = 8.62k
=
R NOM =
? R NTC at 25 ° C
R NOM =
? ( R COLD ? R HOT ) ? R HOT
R 1 = ?
R NOM =
? R NTC at 25 ° C
R COLD ? R HOT 10k ? ( 2.816 ? 0.4086 )
R NOM = =
? ( 2.816 ? 0.4086 ) ? 0.4086
R 1 = 10k ? ?
Thermistors
The LTC4069 NTC trip points are designed to work with
thermistors whose resistance-temperature character-
istics follow Vishay Dale’s “R-T Curve 1.” The Vishay
NTHS0603N01N1003J is an example of such a thermistor.
However, Vishay Dale has many thermistor products that
follow the “R-T Curve 1” characteristic in a variety of sizes.
Furthermore, any thermistor whose ratio of R COLD to R HOT
is about 6 will also work (Vishay Dale R-T Curve 1 shows
a ratio of R COLD to R HOT of 3.266/0.5325 = 6.13).
Designers may want to use thermistors whose room
temperature value is different than 100k. Vishay Dale
has a number of values of thermistor from 32k to 100k
that follow the “R-T Curve 1.” Using different R-T curves,
such as Vishay Dale “R-T Curve 2”, is also possible. This
curve, combined with LTC4069 internal thresholds, gives
temperature trip points of approximately –3°C (falling) and
42°C (rising), a delta of 45°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 higher temperatures. To calculate
R NOM for a shift to lower temperature for example, use
the following equation:
R COLD
3.266
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
0.5325
where R HOT is the resistance ratio of R NTC at the desired
hot temperature trip point.
Here is an example using a 10k R-T Curve 2 thermistor
from Vishay Dale. The difference between the trip points
is 45°C, from before, and we want the cold trip point to
be 0°C, which would put the hot trip point at 45°C. The
R NOM needed is calculated as follows:
R COLD
3.266
2.816
3.266
The nearest 1% value for R NOM is 8.66k. This is the value
used to bias the NTC thermistor to get cold and hot trip
points of approximately 0°C and 45°C respectively. To
extend the delta between the cold and hot trip points, a
resistor, R1, can be added in series with R NTC (see Figure
6). The values of the resistors are calculated as follows:
R COLD ? R HOT
3.266 ? 0.5325
? 0.5325 ?
? 3.266 ? 0.5325 ? ?
where R NOM is the value of the bias resistor and R HOT and
R COLD are the values of R NTC at the desired temperature
trip points. Continuing the example from before with a
desired trip point of 50°C:
3.266 ? 0.5325 3.266 ? 0.5325
= 8.8k, 8.87k is the nearest 1% value.
? 0.5325 ?
? 3.266 ? 0.5325 ? ?
= 604 Ω , 604 is the nearest 1% value.
15
For more information www.linear.com/LTC4069
4069fc
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