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LTC4054L-4.2 PDF预览

LTC4054L-4.2

更新时间： 2024-10-01 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 电池
页数 文件大小 规格书
16页 215K
描述
采用 ThinSOT 封装的 150mA 独立线性锂离子电池充电器

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LTC4054L-4.2 数据手册

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LTC4054L-4.2  
150mA Standalone Linear  
Li-Ion Battery Charger in ThinSOT  
FeaTures  
DescripTion  
The LTC®4054L is a complete, constant-current/constant-  
voltage linear charger for single cell lithium-ion batteries.  
n
Programmable Charge Current Range:  
10mA to 150mA  
n
No External MOSFET, Sense Resistor or Blocking  
Diode Required  
Complete Linear Charger in ThinSOT™ Package for  
Single Cell/Coin Cell Lithium-Ion Batteries  
Constant-Current/Constant-Voltage Operation with  
Thermal Regulation* to Maximize Charge Rate  
without Risk of Overheating  
Its small size and ability to regulate low charge currents  
make the LTC4054L especially well-suited for portable ap-  
plicationsusinglowcapacityrechargeablelithium-ioncoin  
cells. Furthermore, the LTC4054L is specifically designed  
to work within USB power specifications.  
n
n
No external sense resistor is needed, and no blocking  
diode is required due to the internal MOSFET architecture.  
Thermalfeedbackregulatesthechargecurrenttoeliminate  
thermaloverdesign.Thechargevoltageisfixedat4.2V,and  
the charge current can be programmed externally with a  
single resistor. The LTC4054L automatically terminates a  
charge cycle when the charge current drops to 1/10th the  
programmed value after the final float voltage is reached.  
n
Charges Single Cell Li-Ion Batteries Directly from  
USB Port  
n
n
n
n
n
n
n
n
n
Preset 4.2V Charge Voltage with 1ꢀ Accuracy  
Charge Current Monitor Output for Gas Gauging*  
Automatic Recharge  
Charge Status Output Pin  
C/10 Charge Termination  
25µA Max Supply Current in Shutdown Mode  
2.9V Trickle Charge Threshold  
Soft-Start Limits Inrush Current  
Available in a 5-Lead Low Profile (1mm)  
SOT-23 Package  
When the input supply (wall adapter or USB supply) is  
removed,theLTC4054Lautomaticallyentersalowcurrent  
state, dropping the battery drain current to less than 2µA.  
The LTC4054L can be put into shutdown mode, reducing  
the supply current to 25µA.  
Otherfeaturesincludechargecurrentmonitor,undervoltage  
lockout, automatic recharge and a status pin to indicate  
charge termination and the presence of an input voltage.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property  
of their respective owners. *Protected by U.S. Patents including 6,522,118.  
applicaTions  
n
Charger for Li-Ion Coin Cell Batteries  
n
Portable MP3 Players, Wireless Headsets  
n
Bluetooth Applications  
n
Multifunction Wristwatches  
Typical applicaTion  
Complete Charge Cycle (130mAh Battery)  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
4.4  
4.3  
4.2  
4.1  
4.0  
3.9  
3.8  
3.7  
3.6  
3.5  
3.4  
90mA Li-Ion Single Coin Cell Charger  
CONSTANT  
CURRENT  
V
IN  
CONSTANT  
VOLTAGE  
4.5V TO 6.5V  
1µF  
4
V
3
5
CC  
BAT  
90mA  
LTC4054L-4.2  
4.2V  
PROG  
COIN CELL  
Li-Ion  
V
= 5V  
CC  
JA  
GND  
θ
= 130°C/W  
1.69k  
BATTERY  
R
T
= 1.69k  
PROG  
= 25°C  
2
A
4054l42 TA01  
0
0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25  
TIME (HOURS)  
4054l42 TA01b  
4054l42fa  
1
1234567...16

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