- 您现在的位置：买卖IC网 > PDF目录16020 > LTC4055EUF#TRPBF (Linear Technology)IC USB PWR MNGR BATT CHRGR 16QFN PDF资料下载
参数资料
| 型号： | LTC4055EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MNGR BATT CHRGR 16QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 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： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
LTC4055/LTC4055-1
OPERATION
V NTC
15
LTC4055/LTC4055-1
NTC BLOCK
V NTC
15
LTC4055/LTC4055-1
NTC BLOCK
R NOM
100k
NTC
16
0.74 ? V NTC
–
+
TOO_COLD
R NOM
121k
NTC
16
0.74 ? V NTC
–
+
TOO_COLD
R NTC
R1
100k
–
TOO_HOT
13.3k
–
TOO_HOT
0.29 ? V NTC
+
R NTC
0.29 ? V NTC
+
100k
+
NTC_ENABLE
+
NTC_ENABLE
0.1V
–
(3a)
4055 F03a
0.1V
–
(3b)
4055 F03b
Figure 3. NTC Circuits
R COLD
THERMISTORS
The LTC4055/LTC4055-1 NTC trip points were designed
to work with thermistors whose resistance-temperature
characteristics follow Vishay Dale’s “R-T Curve 2.” The
Vishay NTHS0603N02N1002J is an example of such a
thermistor. However, Vishay Dale has many thermistor
products that follow the “R-T Curve 2” characteristic in
a variety of sizes. Furthermore, any thermistor whose
R NOM for a shift to lower temperature for example, use
the following equation:
R NOM = ? R NTC at 25 ° C
2 . 815
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:
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).
R NOM =
R HOT
0 . 4086
? R NTC at 25 ° C
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 1.” Using these as indicated
in the NTC Thermistor section will give temperature trip
points of approximately 3°C and 47°C, a delta of 44°C. This
delta in temperature can be moved in either direction by
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:
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. To calculate
R NOM =
=
R COLD
2 . 815
3.266
2 . 815
? R NTC at 25 ° C
? 100 k = 116 k
4055fb
17
相关PDF资料 |
PDF描述 |
|---|---|
| VLF5012AT-3R3M1R3 | INDUCTOR POWER 3.3UH 1.3A SMD |
| RPS0J471MCN1GS | CAP ALUM 470UF 6.3V 20% SMD |
| M3RRK-4006J | IDC CABLE - MPR40K/MC40G/MPR40K |
| GCM24DCAH | CONN EDGECARD 48POS R/A .156 SLD |
| RP10-2415SE/M1-HC | CONV DC/DC 10W 18-36VIN 15VOUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4056 | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| LTC4056-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear Li-Ion Charger with Termination in ThinSOT |
| LTC4056ETS8-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear Li-Ion Charger with Termination in ThinSOT |
| LTC4056ETS8-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4056ETS8-4.2#TRM | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。