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参数资料
| 型号： | LTC4088EDE |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 2.7 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, PLASTIC, DFN-14 |
| 文件页数： | 11/24页 |
| 文件大小： | 272K |
| 代理商： | LTC4088EDE |
LTC4088
19
4088f
From the Vishay Curve 1 R-T characteristics, rHOT is 0.2488
at 60°C. Using the above equation, RNOM should be set
to 46.4k. With this value of RNOM, 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-
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 4b. The following formulas can be used
to compute the values of RNOM and R1:
R
rr
R
RR
r
NOM
COLD
HOT
NOM
HOT
=
–
.
.
–
2 714
25
1 0 536
R
R25
For example, to set the trip points to 0°C and 45°C with
a Vishay Curve 1 thermistor choose:
Rk
k
NOM ==
3 266 0 4368
2 714
100
104 2
.– .
.
the nearest 1% value is 105k:
R1 = 0.536 105k – 0.4368 100k = 12.6k
the nearest 1% value is 12.7k. The nal solution is shown
in Figure 4b and results in an upper trip point of 45°C and
a lower trip point of 0°C.
USB Inrush Limiting
The USB specication allows at most 10F of downstream
capacitance to be hot-plugged into a USB hub. In most
LTC4088 applications, 10F should be enough to provide
adequate ltering on VBUS. If more capacitance is required,
the following circuit can be used to soft-connect additional
capacitance.
In this circuit, capacitor C1 holds MP1 off when the cable
is rst connected. Eventually the bottom plate of C1 dis-
charges to GND, applying increasing gate support to MP1.
APPLICATIO S I FOR ATIO
WU
U
R1
40k
5V USB
INPUT
4088 F05
C1
100nF
C2
MP1
Si2333
USB CABLE
VBUS
GND
LTC4088
Figure 5. USB Soft-Connect Circuit
–
+
–
+
RNOM
100k
RNTC
100k
NTC
0.1V
NTC_ENABLE
4088 F04a
LTC4088
NTC BLOCK
TOO_COLD
TOO_HOT
0.765 VBUS
0.349 VBUS
–
+
1
VBUS
T
–
+
–
+
RNOM
105k
RNTC
100k
R1
12.7k
NTC
VBUS
0.1V
NTC_ENABLE
4088 F04b
TOO_COLD
TOO_HOT
0.765 VBUS
0.349 VBUS
–
+
1
LTC4088
NTC BLOCK
T
(4a)
(4b)
Figure 4. NTC Circuits
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4088EDE#PBF | 功能描述:IC CHRGR BATT HE 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4088EDE#TRPBF | 功能描述:IC BATT CHARGER/USB 14-DFN RoHS:是 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 |
| LTC4088EDE-1#PBF | 功能描述:IC BATT CHARGER/USB 14-DFN RoHS:是 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 |
| LTC4088EDE-1#TRPBF | 功能描述:IC BATT CHARGER/USB 14-DFN RoHS:是 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 |
| LTC4088EDE-1-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage |
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