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LTC1760_11

更新时间： 2024-11-23 11:42:07
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
48页 349K
描述
Dual Smart Battery System Manager Available in 48-Lead TSSOP Package

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LTC1760_11 数据手册

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LTC1760  
Dual Smart Battery  
System Manager  
FEATURES  
DESCRIPTION  
The LTC®1760 Smart Battery System Manager is a highly-  
integrated SMBus Level 3 battery charger and selector  
intended for products using dual smart batteries. Three  
SMBus interfaces allow the LTC1760 to servo to the  
internal voltage and currents measured by the batteries  
while allowing an SMBus Host device to monitor either  
battery’s status. Charging accuracy is determined by the  
battery’s internal voltage and current measurements, typi-  
cally better than 0.ꢀ2.  
n
SMBus Charger/Selector for Two Smart Batteries*  
n
Voltage and Current Accuracy within 0.2% of Value  
Reported by Battery  
n
Simplifies Construction of “Smart Battery System  
Manager”  
n
Includes All SMBus Charger V1.1 Safety Features  
n
Supports Autonomous Operation without a Host  
n
Allows Both Batteries to Discharge Simultaneously  
into Single Load with Low Loss (Ideal Diode)  
n
A proprietary PowerPath architecture supports simultane-  
ouschargingordischargingofbothbatteries.Typicalbattery  
run times are extended by up to 102, while charging times  
are reduced by up to 502. The LTC1760 automatically  
switchesbetweenpowersourcesinlessthan10μstoprevent  
power interruption upon battery or wall adapter removal.  
SMBus Switching for Dual Batteries with Alarm  
Monitoring for Charging Battery at All Times  
n
Pin Programmable Limits for Maximum Charge  
Current and Voltage Improve Safety  
n
Fast Autonomous PowerPath™ Switching (<10μs)  
n
Low Loss Simultaneous Charging of Two Batteries  
n
>952 Efficient Synchronous Buck Charger  
The LTC1760 implements all elements of a version 1.1  
“SmartBatterySystemManager”exceptforthegeneration  
of composite battery information. An internal multiplexer  
cleanly switches the SMBus Host to either of the two  
attached Smart Batteries without generating partial mes-  
sages to batteries or SMBus Host. Thermistors on both  
batteriesareautomaticallymonitoredfortemperatureand  
disconnection information (SafetySignal).  
n
AC Adapter Current Limiting* Maximizes Charge Rate  
n
SMBus Accelerator Improves SMBus Timing**  
n
Available in 48-Lead TSSOP Package  
APPLICATIONS  
n
Portable Computers and Instruments  
n
Standalone Dual Smart Battery Chargers  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including *57ꢀ3970 **6650174.  
n
Battery Backup Systems  
TYPICAL APPLICATION  
Dual Battery Charger/Selector System Architecture  
Dual vs Sequential Charging  
3500  
DC  
IN  
BATꢀ  
BAT1  
CURRENT  
3000  
ꢀ500  
ꢀ000  
1500  
1000  
500  
CURRENT  
SEQUENTIAL  
SYSTEM  
POWER  
0
3500  
3000  
ꢀ500  
ꢀ000  
1500  
1000  
500  
LTC1760  
BAT1  
CURRENT  
SMBus (HOST)  
BATꢀ  
DUAL  
CURRENT  
100  
MINUTES  
SafetySignal 1  
SMBus 1  
0
0
100  
150  
ꢀ00 ꢀ50  
300  
50  
TIME (MINUTES)  
BATTERY TYPE: 10.8V Li-Ion (MOLTECH NIꢀ0ꢀ0)  
REQUESTED CURRENT = 3A  
SafetySignal ꢀ  
REQUESTED VOLTAGE = 1ꢀ.3V  
MAX CHARGER CURRENT = 4.1A  
1760 TA03  
SMBus ꢀ  
1760 TA01  
1760fa  
1
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