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LTC1732EMS-8.4 PDF预览

LTC1732EMS-8.4

更新时间： 2024-01-20 14:09:47
品牌 Logo 应用领域
凌特 - Linear 电池控制器
页数 文件大小 规格书
12页 150K
描述
Lithium-Ion Linear Battery Charger Controller

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LTC1732EMS-8.4 数据手册

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LTC1732-8.4  
Lithium-Ion Linear  
Battery Charger Controller  
U
DESCRIPTIO  
FEATURES  
The LTC®1732-8.4 is a complete constant-current/con-  
stant-voltage linear charge controller for lithium-ion  
(Li-Ion)batteries.Nickel-cadmium(NiCd)andnickelmetal-  
hydride (NiMH) batteries can also be charged with con-  
stant current using external termination. Charge current  
can be programmed with ±7% accuracy using external  
sense and program resistors. An internal resistor divider  
andprecisionreferencesetthefinalfloatvoltagewith±1%  
accuracy.  
■
Complete Linear Charger Controller for 2-Cell  
Lithium-Ion Batteries  
■
Preset Charge Voltage with ±1% Accuracy  
■
Programmable Charge Current  
■
C/10 Charge Current Detection Output  
■
Programmable Charge Termination Timer  
■
Small, Thin 10-Pin MSOP Package  
■
Input Supply (Wall Adapter) Detection Output  
■
8.8V to 12V Input Voltage Range  
■
Automatic Sleep Mode When Input Supply  
When the input supply is removed, the LTC1732-8.4  
automatically enters a low current sleep mode, dropping  
the battery drain current to 10µA. An internal comparator  
detects the end-of-charge (C/10) condition while a pro-  
grammable timer, using an external capacitor, sets the  
total charge time. Fully discharged cells are automatically  
trickle charged at 10% of the programmed current until  
battery voltage exceeds 4.9V.  
Is Removed (Only 10µA Battery Drain)  
■
Automatic Trickle Charging of Low Voltage Cells  
■
Programmable for Constant-Current-Only Mode  
■
Battery Insertion Detect and Automatic Charging  
of Low-Battery  
Automatic Battery Recharge  
■
U
APPLICATIO S  
The LTC1732-8.4 begins a new charge cycle when a  
dischargedbatteryisconnectedtothechargerorwhenthe  
input power is applied. In additon, if the battery remains  
connected to the charger and the cell voltage drops below  
8.05V, a new charge cycle will begin.  
■
Cellular Phones  
■
Handheld Computers  
■
Charging Docks and Cradles  
■
Digital Cameras and Camcorders  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
TheLTC1732-8.4isavailableinthe10-pinMSOPpackage.  
U
TYPICAL APPLICATIO  
400mA 2-Cell 8.4V Li-Ion Battery Charger  
Typical Li-Ion Charge Cycle  
V
IN  
= 10V  
9
CONSTANT  
CURRENT  
CONSTANT  
VOLTAGE  
MBRM120T3  
2
8
BATTERY VOLTAGE  
R1  
1k  
R2  
1k  
R
SENSE  
SEL  
V
1µF  
CC  
0.25Ω  
400  
300  
200  
100  
0
8
7
6
9
7
400mA HR BATTERY  
SENSE  
DRV  
3
Q1  
Si9430DY  
CHRG  
CHARGE CURRENT  
LTC1732-8.4  
I
= 400mA  
BAT  
10  
4
1
6
ACPR  
BAT  
CHRG  
LED OFF  
TIMER  
TIMER  
STOPS  
PROG  
C
+
TIMER  
0.1µF  
8.4V  
Li-Ion  
BATTERY  
GND  
R
*
PROG  
19.6k  
10µF  
5
2.0  
TIME (HOURS)  
3.0  
0
0.5  
1.0  
1.5  
2.5  
1732-8.4 TA01  
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN  
1732-8.4 TA01b  
17328f  
1
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