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LP3947

更新时间： 2024-11-16 11:06:35
品牌 Logo 应用领域
德州仪器 - TI 电池
页数 文件大小 规格书
20页 836K
描述
USB/交流适配器，单节锂离子电池充电器 IC

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中文翻译

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LP3947 数据手册

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LP3947  
www.ti.com  
SNVS298B –NOVEMBER 2004–REVISED APRIL 2013  
LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC  
Check for Samples: LP3947  
1
FEATURES  
DESCRIPTION  
The LP3947 is a complete charge management  
system that safely charges and maintains a Li-Ion  
battery from either USB power source or AC adaptor.  
In USB mode, the LP3947 supports charging in low  
power or high power mode. Alternatively, 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.  
23  
•
Supports USB Charging Scheme  
Integrated Pass Transistor  
•
•
•
•
•
•
•
•
•
Near-Depleted Battery Preconditioning  
Monitors Battery Temperature  
Built-In 5.6 Hour Timer  
Under Voltage and Over Voltage Lockout  
Charge Status Indicators  
Charge Current Monitor Analog Output  
LDO Mode Operation can source 1 Amp  
Continuous Over Current/Temperature  
Protection  
APPLICATIONS  
•
•
•
•
•
Cellular Phones  
The LP3947 operates in four modes: pre-qualification,  
constant 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.  
PDAs  
Digital Cameras  
USB Powered Devices  
Programmable Current Sources  
KEY SPECIFICATIONS  
•
1% Charger Voltage Accuracy Over  
0°C ≤ TJ ≤ 85°C  
•
•
4.3V to 6V Input Voltage Range  
100 mA to 750 mA Charge Current Range, in  
Charger Mode  
•
•
100 mA to 500 mA Charge Current Range, in  
USB Mode  
WSON Package Power Dissipation:  
2.7W at TA = 25°C  
TYPICAL APPLICATION CIRCUIT  
To  
System  
Supply  
CHG-IN  
1 mF  
BATT  
USB Power Source  
4.3V to 5.5V  
Li-Ion  
10 mF  
VB  
Sense  
R
T
T
S
LP3947  
CHG  
EOC  
R
S
V
T
Diff-Amp  
SCL  
SDA  
ISEL  
MODE  
GND  
EN  
More Application Circuit can be found in APPLICATION NOTES.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
I2C is a trademark of Philips Semiconductor Corporation.  
2
3
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2004–2013, Texas Instruments Incorporated  
1234567...20

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