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LT1571 Datasheet(PDF) 1 Page - Linear Technology |
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LT1571 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 48 page  LTC1760 1 1760fa TYPICAL APPLICATION FEATURES DESCRIPTION Dual Smart Battery System Manager 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%. A proprietary PowerPath architecture supports simultane- ouschargingordischargingofbothbatteries.Typicalbattery run times are extended by up to 10%, while charging times are reduced by up to 50%. The LTC1760 automatically switchesbetweenpowersourcesinlessthan10μstoprevent power interruption upon battery or wall adapter removal. The LTC1760 implements all elements of a version 1.1 “Smart Battery System Manager” except for the generation 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 batteries are automatically monitored for temperature and disconnection information (SafetySignal). Dual vs Sequential Charging APPLICATIONS 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 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 >95% Efficient Synchronous Buck Charger n AC Adapter Current Limiting* Maximizes Charge Rate n SMBus Accelerator Improves SMBus Timing** n Available in 48-Lead TSSOP Package n Portable Computers and Instruments n Standalone Dual Smart Battery Chargers n Battery Backup Systems LTC1760 DC IN SYSTEM POWER SMBus (HOST) 1760 TA01 SafetySignal 1 SMBus 1 SafetySignal 2 SMBus 2 TIME (MINUTES) 3500 3000 2500 2000 1500 1000 500 0 3500 3000 2500 2000 1500 1000 500 0 1760 TA03 0 50 100 150 200 250 300 BAT1 CURRENT BAT2 CURRENT SEQUENTIAL DUAL BAT1 CURRENT 100 MINUTES BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020) REQUESTED CURRENT = 3A REQUESTED VOLTAGE = 12.3V MAX CHARGER CURRENT = 4.1A BAT2 CURRENT Dual Battery Charger/Selector System Architecture 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 *5723970 **6650174. |
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