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| 型号： | LTC4069EDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/18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
I BAT =
approximate ambient temperature at which the thermal
feedback begins to protect the IC is:
T A = 115°C – P D ? θ JA
T A = 115°C – (V CC – V BAT ) ? I BAT ? θ JA
Example: Consider an LTC4069 operating from a 5V wall
adapter providing 750mA to a 3.6V Li-Ion battery. The
ambient temperature above which the LTC4069 will begin
to reduce the 750mA charge current is approximately:
T A = 115°C – (5V – 3.6V) ? (750mA) ? 60°C/W
T A = 115°C – (1.05W ? 60°C/W) = 115°C – 63°C
T A = 52°C
The LTC4069 can be used above 70°C, but the charge
current will be reduced from 750mA. The approximate
current at a given ambient temperature can be calculated:
115 ° C – T A
( V CC – V BAT ) ? θ JA
copper areas or internal copper layers connected using
vias. Correctly soldered to a 2500mm 2 double-sided 1
oz. copper board the LTC4069 has a thermal resistance
of approximately 60°C/W. Failure to make thermal contact
between the Exposed Pad on the backside of the package
and the copper board will result in thermal resistances far
greater than 60°C/W. As an example, a correctly soldered
LTC4069 can deliver over 750mA to a battery from a 5V
supply at room temperature. Without a backside thermal
connection, this number could drop to less than 500mA.
V CC Bypass Capacitor
Many types of capacitors can be used for input bypassing;
however, caution must be exercised when using multi-layer
ceramic capacitors. Because of the self-resonant and high
Q characteristics of some types of ceramic capacitors, high
voltage transients can be generated under some start-up
conditions, such as connecting the charger input to a live
power source. For more information, refer to Application
Note 88.
I BAT =
=
= 500mA
Using the previous example with an ambient temperature
of 73°C, the charge current will be reduced to
approximately:
115 ° C –73 ° C 42 ° C
( 5V –3.6V ) ? 60 ° C/W 84 ° C/A
Furthermore, the voltage at the PROG pin will change
proportionally with the charge current as discussed in
the Programming Charge Current section.
It is important to remember that LTC4069 applications do
not need to be designed for worst-case thermal conditions
since the IC will automatically limit power dissipation when
the junction temperature reaches approximately 115°C.
R NOM
8.87k
R1
604
R NTC
10k
6
V CC
0.76 ? V CC
NTC
0.35 ? V CC
+
TOO COLD
TOO HOT
NTC_ENABLE
Board Layout Considerations
0.016 ? V CC
–
In order to deliver maximum charge current under all
conditions, it is critical that the exposed metal pad on
the backside of the LTC4069 package is soldered to the
PC board copper and extending out to relatively large
Figure 6. NTC Circuits
4069 F06
14
For more information www.linear.com/LTC4069
4069fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4069EDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input |
| LTC4070 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Ultralow Voltage Step-Up Converter and Power Manager |
| LTC4070EDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070EDDB#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 50mA 4.2V 10-Pin DFN EP Bulk 制造商:Linear Technology 功能描述:IC BATTERY CHARGER 50mA DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8; Battery Type:Li-Ion, Li-Polymer; Battery Charge Voltage:4.2V; Charge Current Max:50mA; Battery IC Case Style:DFN; No. of Pins:8; No. of Series Cells:1; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| LTC4070EDDB#TRMPBF | 功能描述:IC LI-ION/POLY BATT CHARGER 8DFN 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 |
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