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LTC1760

更新时间： 2024-11-19 04:43:43
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
44页 367K
描述
Dual Smart Battery System Manager

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LTC1760 数据手册

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Final Electrical Specifications  
LTC1760  
Dual Smart Battery  
System Manager  
U
May 2003  
DESCRIPTIO  
FEATURES  
The LTC®1760 Smart Battery System Manager is a highly  
integratedlevel3batterychargerandselectorintendedfor  
products using dual smart batteries. Three SMBus inter-  
faces allow the LTC1760 to servo to the internal voltage  
and currents measured by the batteries while allowing an  
SMBus Host to monitor either battery’s status. Charging  
accuracy is determined by the battery’s internal voltage  
and current measurement, typically better than ±0.2%.  
A proprietary PowerPathTMarchitecture supports simulta-  
neous charging or discharging of both batteries. Typical  
battery run times are extended by up to 10%, while  
charging times are reduced by up to 50%. The LTC1760  
automatically switches between power sources in less  
than 10µs to prevent power interruption upon battery or  
wall adapter removal.  
■
SMBus Charger/Selector for Two Smart Batteries*  
Voltage and Current Accuracy within 0.2% of Value  
Reported by Battery  
Simplifies Construction of “Smart Battery System  
Manager”  
■
■
■
■
■
Includes All SMBus Charger V1.1 Safety Features  
Supports Autonomous Operation without a Host  
SMBus Switching for Dual Batteries with Alarm  
Monitoring for Charging Battery at All Times  
Pin Programmable Limits for Maximum Charge  
Current and Voltage Improve Safety  
Allows Both Batteries to Discharge Simultaneously  
into Single Load with Low Loss (Ideal Diode)  
Fast Autonomous Power Path Switching (<10µs)  
Low Loss Simultaneous Charging of Two Batteries  
>95% Efficient Synchronous Buck Charger  
AC Adapter Current Limiting* Maximizes Charge Rate  
SMBus Accelerator Improves SMBus Timing**  
Available in 48-Lead TSSOP Package  
■
■
■
■
■
■
■
■
The LTC1760 implements all elements of a version 1.1  
“Smart Battery System Manager” except for the genera-  
tion of composite battery information. An internal multi-  
plexer cleanly switches the SMBus Host to either of the  
two attached Smart Batteries without generating partial  
messages to batteries or SMBus Host. Thermistors on  
both batteries are automatically monitored for tempera-  
ture and disconnection information (SafetySignal).  
U
APPLICATIO S  
■
Portable Computers and Instruments  
■
Standalone Dual Smart Battery Chargers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
PowerPath is a trademark of Linear Technology Corporation  
Battery Backup Systems  
*U.S. Patent No. 5,723,970 **U.S. Patent No. 6,650,174  
U
TYPICAL APPLICATIO  
Dual Battery Charger/Selector System Architecture  
DC  
IN  
Dual vs Sequential Charging  
3500  
BAT2  
BAT1  
CURRENT  
3000  
2500  
2000  
1500  
1000  
500  
CURRENT  
SYSTEM  
POWER  
SEQUENTIAL  
0
LTC1760  
3500  
3000  
2500  
2000  
1500  
1000  
500  
SMBus (HOST)  
BAT1  
CURRENT  
BAT2  
DUAL  
CURRENT  
SafetySignal 1  
SMBus 1  
100  
MINUTES  
0
0
100  
150  
200 250  
300  
50  
TIME (MINUTES)  
BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020)  
REQUESTED CURRENT = 3A  
SafetySignal 2  
SMBus 2  
REQUESTED VOLTAGE = 12.3V  
1760 TA01  
MAX CHARGER CURRENT = 4.1A  
1760 TA03  
sn1760 1760is  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
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