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LTC4059A

更新时间： 2024-11-19 11:45:59
品牌 Logo 应用领域
Linear Systems 电池
页数 文件大小 规格书
18页 183K
描述
Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN

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LTC4059A 数据手册

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LTC4065L/  
LTC4065LX/LTC4065L-4.1  
Standalone 250mA Li-Ion  
Battery Charger in 2 × 2 DFN  
FEATURES  
DESCRIPTION  
The LTC®4065L is a complete constant-current/constant-  
voltage linear charger for single-cell lithium-ion batteries.  
Its small size and ability to accurately regulate low charge  
currents make the LTC4065L especially well-suited for  
portable applications using low capacity rechargeable  
lithium-ion cells. Furthermore, LTC4065L is specifically  
designed to work within USB power specifications.  
n
Charge Current Programmable up to 250mA with  
5% Accuracy  
n
Complete Linear Charger in 2mm × 2mm DFN Package  
n
C/10 Charge Current Detection Output  
Timer Termination  
n
n
No External MOSFET, Sense Resistor or Blocking  
Diode Required  
n
Preset Float Voltage with 0.6% Accuracy:  
The CHRG pin indicates when charge current has dropped  
to ten percent of its programmed value (C/10). An internal  
timer terminates charging according to battery manufac-  
turer specifications.  
4.2V for LTC4065L/LTC4065LX  
4.1V for LTC4065L-4.1  
Constant-Current/Constant-Voltage Operation with  
n
Thermal Feedback to Maximize Charging Rate  
Without Risk of Overheating  
TheLTC4065L-4.1featuresaconstant-voltagefloatvoltage  
of 4.1V. This 4.1V version of the standard LTC4065L is in-  
tendedforback-uporhighambienttemperatureapplications.  
Under these conditions, a reduced float voltage will trade-  
off initial cell capacity for the benefit of increased capacity  
retention over the life of the battery. A reduced float voltage  
also minimizes swelling in prismatic and polymer cells.  
n
Charge Current Monitor Output for Gas Gauging  
n
Automatic Recharge  
n
Charges Single Cell Li-Ion Batteries Directly from  
USB Port  
n
20μA Supply Current in Shutdown Mode  
n
Available Without Trickle Charge (LTC4065LX)  
n
Tiny 6-Lead (2mm × 2mm) DFN Package  
When the input supply (wall adapter or USB supply) is  
removed,theLTC4065Lautomaticallyentersalowcurrent  
state,droppingbatterydraincurrenttolessthan1μA.With  
powerapplied,LTC4065Lcanbeputintoshutdownmode,  
reducing the supply current to less than 20μA.  
APPLICATIONS  
n
Charger for Li-Ion Coin Cell Batteries  
n
Portable MP3 Players, Wireless Headsets  
n
Bluetooth Applications  
Multifunction Wristwatches  
The full-featured LTC4065L also includes automatic re-  
charge,low-batterychargeconditioning(tricklecharging)  
and soft-start (to limit inrush current).  
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 6522118, 6700364.  
Complete Charge Cycle (180mAh Battery)  
LTC4065L and LTC4065LX  
TYPICAL APPLICATION  
110  
Standalone Li-Ion Battery Charger  
100  
90 CONSTANT  
CURRENT  
4.3  
4.1  
3.9  
3.7  
3.5  
3.3  
100mA  
V
IN  
CONSTANT  
VOLTAGE  
V
BAT  
LTC4065L  
CHRG PROG  
EN GND  
80  
70  
60  
50  
40  
30  
20  
10  
0
CC  
4.3V TO 5.5V  
R1  
510Ω  
4.2V  
C1  
1μF  
CHRG  
TRANSITION  
+
Li-Ion  
BATTERY  
R3  
2k  
4065L TA01  
CHARGE  
TERMINATION  
V
= 5V  
PROG  
CC  
R
= 2k  
0
1
1.5  
2
2.5  
3
3.5  
4
4.5  
0.5  
TIME (HOURS)  
4065 TA02  
4065lfb  
1
1234567...18

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