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LP3945LD PDF预览

LP3945LD

更新时间： 2024-11-15 20:06:47
品牌 Logo 应用领域
德州仪器 - TI 光电二极管
页数 文件大小 规格书
15页 335K
描述
IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC

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LP3945LD 技术参数

生命周期：Obsolete包装说明：SON, SOLCC14,.16,20
Reach Compliance Code：unknown风险等级：5.81
JESD-30 代码：R-PDSO-N14端子数量：14
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：SON
封装等效代码：SOLCC14,.16,20封装形状：RECTANGULAR
封装形式：SMALL OUTLINE电源：5 V
认证状态：Not Qualified子类别：Power Management Circuits
标称供电电压 (Vsup)：5 V表面贴装：YES
温度等级：INDUSTRIAL端子形式：NO LEAD
端子节距：0.5 mm端子位置：DUAL
Base Number Matches：1

LP3945LD 数据手册

 浏览型号LP3945LD的Datasheet PDF文件第2页浏览型号LP3945LD的Datasheet PDF文件第3页浏览型号LP3945LD的Datasheet PDF文件第4页浏览型号LP3945LD的Datasheet PDF文件第5页浏览型号LP3945LD的Datasheet PDF文件第6页浏览型号LP3945LD的Datasheet PDF文件第7页 
October 2003  
LP3945/LP3946  
Battery Charge Management System  
General Description  
Features  
n Integrated pass transistor  
The LP3945 and LP3946 are complete charge management  
systems that safely charge and maintain a Li-Ion battery or a  
four-cell Ni-MH (LP3945 only) battery pack. The LP3945  
offers the flexibility of programming charge current, battery  
regulation voltage (4.1V/4.2V), battery type (Li-Ion/Ni-MH),  
and End Of Charge (EOC) termination through the use of I2C  
interface. On the LP3946, these parameters are pro-  
grammed at the factory per customer specification.  
n Does not require external charge current setting or  
sensing resistors  
n I2C interface (LP3945 only) — programmable charge  
current, EOC current and battery regulation voltage  
n Near-depleted battery preconditioning  
n Built-in 5.6 hour timer  
n Under voltage and over voltage lockout on adaptor  
n Charge status indicators  
n Charge current monitor analog output  
n LDO mode operation can source 1 amp  
n Continuous over current/temperature protection  
The pass transistor, charge current sensing resistor and  
charge current setting resistors are all integrated inside the  
LP3945 and LP3946. This eliminates the use of external  
components and significantly reduces design time and board  
space.  
The LP3945 and LP3946 operate in four modes: pre-  
qualification, constant current, constant voltage and mainte-  
nance modes. The LP3945 features Ni-MH charging mode  
as well. The charger has under-voltage and over-voltage  
protection as well as an internal 5.6 hr timer to prevent  
overcharging the battery. There are two open drain outputs  
for status indication. An internal amplifier readily converts the  
charge current into a voltage. Also, the charger can operate  
in an LDO mode providing up to 1 Amp to the load.  
Key Specifications  
n 1% charger voltage accuracy over 0˚C ≤ TJ ≤ 85˚C  
n 4.5V to 6.0V input voltage range  
n LLP package power dissipation: 2.7W at TA = 25˚C  
Applications  
n Cellular phones  
n PDAs  
n Digital cameras  
n USB powered devices  
n Programmable current sources  
Typical Application Circuit  
20066502  
20066501  
© 2003 National Semiconductor Corporation  
DS200665  
www.national.com  
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