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LTC4069

更新时间： 2024-09-15 05:43:59
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
16页 193K
描述
Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input

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中文翻译

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LTC4069 数据手册

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LTC4069  
Standalone 750mA Li-Ion  
Battery Charger in 2 × 2 DFN  
with NTC Thermistor Input  
DESCRIPTION  
FEATURES  
The LTC®4069 is a complete constant-current/constant-  
voltage linear charger for single-cell lithium-ion batteries.  
The2mm×2mmDFNpackageandlowexternalcomponent  
countmaketheLTC4069especiallywell-suitedforportable  
applications.Furthermore,LTC4069isspecificallydesigned  
to work within USB power specifications.  
n
Complete Linear Charger in 2mm × 2mm DFN  
Package  
n
C/10 Charge Current Detection Output  
n
Timer Charge Termination  
n
Charge Current Programmable up to 750mA with  
5% Accuracy  
n
No External MOSFET, Sense Resistor or Blocking  
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  
manufacturer specifications.  
Diode Required  
n
NTC Thermistor Input for Temperature Qualified  
Charging  
n
Preset 4.2V Float Voltage with 0.6% Accuracy  
n
No external sense resistor or blocking diode is required  
duetotheinternalMOSFETarchitecture.Thermalfeedback  
regulates charge current to limit the die temperature  
during high power operation or high ambient temperature  
conditions.  
Constant-Current/Constant-Voltage Operation with  
Thermal Feedback to Maximize Charge Rate  
Without Risk of Overheating  
n
n
n
Charge Current Monitor Output for Gas Gauging  
Automatic Recharge  
Charges Single Cell Li-Ion Batteries Directly from  
USB Port  
20μA Supply Current in Shutdown Mode  
Soft-Start Limits Inrush Current  
Tiny 6-Lead (2mm × 2mm) DFN Package  
When the input supply (wall adapter or USB supply) is  
removed, the LTC4069 automatically enters a low current  
state,droppingbatterydraincurrenttolessthan1μA.With  
power applied, LTC4069 can be put into shutdown mode,  
reducing the supply current to less than 20μA.  
n
n
n
APPLICATIONS  
TheLTC4069alsoincludesautomaticrecharge,low-battery  
charge conditioning (trickle charging), soft-start (to limit  
inrush current) and an NTC thermistor input used to  
monitor battery temperature.  
n
Wireless PDAs  
n
Cellular Phones  
n
Portable Electronics  
The LTC4069 is available in a tiny 6-lead, low profile  
(0.75mm) 2mm × 2mm DFN package.  
, LT, LTC and LTM 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 (1000mAh Battery)  
TYPICAL APPLICATION  
Standalone Li-Ion Battery Charger  
500mA  
600  
4.50  
CONSTANT  
CURRENT  
CONSTANT  
VOLTAGE  
500  
4.25  
400  
300  
4.00  
3.75  
V
IN  
V
BAT  
LTC4069  
CHRG PROG  
NTC GND  
CHRG  
TRANSITION  
CC  
4.3V TO 5.5V  
R1  
510Ω  
R
NOM  
100k  
4.2V  
+
Li-Ion  
200  
100  
0
3.50  
3.25  
3.00  
BATTERY  
CHARGE  
TERMINATION  
R
PROG  
R
NTC  
100k  
1μF  
2k  
4069 TA01  
V
= 5V  
PROG  
CC  
R
= 2k  
0
0.5  
1
1.5  
2
2.5  
3
3.5  
4
4.5  
5
TIME (HOURS)  
4069 TA01b  
4069fb  
1
1234567...16

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