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LP3947

更新时间： 2024-11-14 23:16:47
品牌 Logo 应用领域
美国国家半导体 - NSC 电池
页数 文件大小 规格书
14页 647K
描述
USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

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LP3947 数据手册

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November 2004  
LP3947  
USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC  
n Near-Depleted Battery Preconditioning  
n Monitors Battery Temperature  
The LP3947 is a complete charge management system that  
n Built-In 5.6 hour timer  
General Description  
safely charges and maintains a Li-Ion battery from either  
USB power source or AC adaptor. In USB mode, the LP3947  
n Under Voltage and Over Voltage Lockout  
n Charge Status Indicators  
n Charge Current Monitor Analog Output  
n LDO Mode Operation can source 1 Amp  
n Continuous Over Current/Temperature Protection  
supports charging in low power or high power mode. Alter-  
natively, the LP3947 can take charge from AC adaptor. In  
both USB and AC adaptor modes, charge current, battery  
regulation voltage, and End of Charge (EOC) point can be  
selected via I2C interface. The LP3947 can also operate on  
default values that are pre-programmed in the factory. The  
battery temperature is monitored continuously at the Ts pin  
to safeguard against hazardous charging conditions. The  
charger also has under-voltage and over-voltage protection  
as well as an internal 5.6 hr timer to protect the battery. The  
pass transistor and charge current sensing resistor are all  
integrated inside the LP3947.  
Key Specifications  
n 1% Charger Voltage Accuracy Over 0˚C ≤ TJ ≤ 85˚C  
n 4.3V to 6.0V Input Voltage Range  
n 100 mA to 750 mA charge current range, in charger  
mode  
n 100mA to 500mA charge current range, in USB mode  
n LLP Package Power Dissipation: 2.7W at TA = 25˚C  
The LP3947 operates in four modes: pre-qualification, con-  
stant current, constant voltage and maintenance modes.  
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 a maximum of 1.2 Amp to the load.  
Applications  
n Cellular Phones  
n PDAs  
n Digital Cameras  
n USB Powered Devices  
n Programmable Current Sources  
Features  
n Supports USB Charging Scheme  
n Integrated Pass Transistor  
Typical Application Circuit  
20111001  
More Application Circuit can be found in the Application Note section.  
© 2004 National Semiconductor Corporation  
DS201110  
www.national.com  
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