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LTC1760 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1760 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 44 page  LTC1760 1 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- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. Final Electrical Specifications s SMBus Charger/Selector for Two Smart Batteries* s Voltage and Current Accuracy within 0.2% of Value Reported by Battery s Simplifies Construction of “Smart Battery System Manager” s Includes All SMBus Charger V1.1 Safety Features s Supports Autonomous Operation without a Host s SMBus Switching for Dual Batteries with Alarm Monitoring for Charging Battery at All Times s Pin Programmable Limits for Maximum Charge Current and Voltage Improve Safety s Allows Both Batteries to Discharge Simultaneously into Single Load with Low Loss (Ideal Diode) s Fast Autonomous Power Path Switching (<10 µs) s Low Loss Simultaneous Charging of Two Batteries s >95% Efficient Synchronous Buck Charger s AC Adapter Current Limiting* Maximizes Charge Rate s SMBus Accelerator Improves SMBus Timing** s Available in 48-Lead TSSOP Package APPLICATIO S FEATURES DESCRIPTIO Dual Smart Battery System Manager May 2003 The LTC ®1760 Smart Battery System Manager is a highly integrated level 3 battery charger and selector intended for 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 PowerPath TMarchitecture 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 10 µs to prevent 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 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). , LTC and LT are registered trademarks of Linear Technology Corporation. s Portable Computers and Instruments s Standalone Dual Smart Battery Chargers s Battery Backup Systems TYPICAL APPLICATIO 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 Dual vs Sequential Charging PowerPath is a trademark of Linear Technology Corporation *U.S. Patent No. 5,723,970 **U.S. Patent No. 6,650,174 LTC1760 DC IN SYSTEM POWER SMBus (HOST) 1760 TA01 SafetySignal 1 SMBus 1 SafetySignal 2 SMBus 2 |
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