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LTC4085-4_15 PDF预览

LTC4085-4_15

更新时间： 2024-02-09 02:56:37
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 283K
描述
USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger

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LTC4085-4_15 数据手册

 浏览型号LTC4085-4_15的Datasheet PDF文件第2页浏览型号LTC4085-4_15的Datasheet PDF文件第3页浏览型号LTC4085-4_15的Datasheet PDF文件第4页浏览型号LTC4085-4_15的Datasheet PDF文件第5页浏览型号LTC4085-4_15的Datasheet PDF文件第6页浏览型号LTC4085-4_15的Datasheet PDF文件第7页 
LTC4085-3/LTC4085-4  
USB Power Manager with  
Ideal Diode Controller and  
3.95V Li-Ion Charger  
DESCRIPTION  
FEATURES  
■
Seamless Transition Between Input Power Sources:  
The LTC®4085-3/LTC4085-4 is a USB power manager  
and Li-Ion/Polymer battery charger designed for portable  
battery-powered applications. The part controls the total  
current used by the USB peripheral for operation and  
battery charging. The total input current can be limited to  
20% or 100% of a programmed value up to 1.5A (typically  
100mA or 500mA). Battery charge current is automati-  
cally reduced such that the sum of the load current and  
charge current does not exceed the programmed input  
current limit.  
Li-Ion/Polymer Battery, USB and 5V Wall Adapter  
■
215mΩ Internal Ideal Diode Plus Optional External  
Ideal Diode Controller Provide Low Loss PowerPath™  
When Wall Adapter/USB Input Not Present  
■
Load Dependent Charging Guarantees Accurate  
USB Input Current Compliance  
■
3.95V Float Voltage Improves Battery Life Span and  
High Temperature Safety Margin  
■
Constant-Current/Constant-Voltage Operation with  
Thermal Feedback to Maximize Charging Rate without  
Risk of Overheating*  
The LTC4085-3/LTC4085-4 includes a complete constant-  
current/constant-voltagelinearchargerforsinglecellLi-Ion  
batteries. These 3.95V versions of the standard LTC4085  
are intended for applications which have extended battery  
lifetimerequirementsorthosethatrequirehightemperature  
(approximately >60°C) operation or storage. 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, and  
avoids open CID (pressure fuse) in cylindrical cells.  
■
Selectable 100% or 20% Input Current Limit  
(e.g., 500mA/100mA)  
■
Battery Charge Current Independently Programmable  
Up to 1.2A  
■
Automatic Output Undervoltage Charge Current  
Reduction (LTC4085-3)  
■
Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package  
APPLICATIONS  
■
Portable USB Devices  
The LTC4085-3/LTC4085-4 also includes a programmable  
terminationtimer,automaticrecharging,anend-of-charge  
status output and an NTC thermistor.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
Bat-Track, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Protected by U.S. Patents, including  
6522118, 6700364. Other patents pending.  
TYPICAL APPLICATION  
I
LOAD  
Input and Battery Current vs Load Current  
5V WALL  
ADAPTER  
INPUT  
TO LDOs,  
RPROG = 100k, RCLPROG = 2k  
REGs, ETC  
600  
4.7μF  
1k  
I
IN  
510Ω  
I
5V (NOM)  
IN  
500  
400  
300  
200  
100  
0
FROM USB  
IN  
WALL  
ACPR  
OUT  
CABLE V  
BUS  
SUSPEND USB POWER  
100mA 500mA SELECT  
SUSP  
HPWR  
4.7μF  
I
LOAD  
LTC4085-3/  
LTC4085-4  
I
BAT  
(CHARGING)  
PROG  
GATE  
*
CLPROG  
NTC  
BAT  
CHRG  
TIMER  
I
BAT  
(DISCHARGING)  
WALL = 0V  
100  
I
GND  
V
NTC  
BAT  
–100  
0
200  
300 500  
400  
(mA)  
600  
+
10k  
I
LOAD  
408534 TA01b  
*
OPTIONAL - TO LOWER  
IDEAL DIODE IMPEDANCE  
0.1μF  
100k  
2k  
10k  
408534 TA01  
408534fb  
1
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