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LTC1759 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1759 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1759 Smart Battery Charger The LTC ®1759 Smart Battery Charger is a single chip charging solution that dramatically simplifies construc- tion of an SBS compliant system. The LTC1759 imple- ments a Level 2 charger function whereby the charger can be programmed by the battery or by the host. A thermistor on the battery being charged is monitored for tempera- ture, connectivity and battery type information. The SMBus interface remains alive when the AC power adapter is removed and responds to all SMBus activity directed to it, including thermistor status (via the ChargerStatus com- mand). The charger also provides an interrupt to the host whenever a status change is detected (e.g., battery removal, AC adapter connection). Charging current and voltage are restricted to chemistry specific limits for improved system safety and reliability. Limits are programmable by two external resistors. Addi- tionally, the maximum average current from the AC adapter is programmable to avoid overloading the adapter when simultaneously supplying load current and charging cur- rent. When supplying system load current, charging cur- rent is automatically reduced to prevent adapter overload. s Single Chip Smart Battery Charger Controller s 100% Compliant (Rev 1.0) SMBus Support Allows for Operation with or without Host s SMBus Accelerator Improves SMBus Timing s Hardware Interrupt and SMBAlert Response Eliminate Interrupt Polling s High Efficiency Synchronous Buck Charger s 0.5V Dropout Voltage; Maximum Duty Cycle > 99.5% s AC Adapter Current Limit Maximizes Charge Rate* s 1% Voltage Accuracy; 5% Current Accuracy s Up to 8A Charging Current Capability s Dual 10-Bit DACs for Charger Voltage and Current Programming s User-Selectable Overvoltage and Overcurrent Limits s High Noise Immunity Thermistor Sensor s Small 36-Lead Narrow (0.209") SSOP Package , LTC and LT are registered trademarks of Linear Technology Corporation. Figure 1. 4A SMBus Smart Battery Charger s Portable Computers s Portable Instruments s Docking Stations *US Patent Number 5,723,970 UV VDD SYNC SDB CHGEN VLIMIT ILIMIT DGND ISET PROG VC COMP1 AGND RNR THERM SDA SCL INTB 22 21 8 32 9 10 2 33 34 1 3 35 30 29 31 23 26 36 3.83k 1.5k LTC1759 1k 1k 499 Ω 475k 10k 0.1 µF 0.33 µF VDD VDD 1 µF 0.68 µF 33k 0.033 Ω 200 Ω 68 Ω 200 Ω 15.8k 1k 0.47 µF 2.2 µF 0.68 µF 0.047 µF 0.1 µF 1 µF 15 µH 22 µF SYSTEM POWER 0.025 Ω 33k 7 16 4 5 12 25 24 18 17 28 27 11 6 20 19 14 15 13 DCIN DCDIV INFET VCC CLP CLN TGATE BOOSTC GBIAS BOOST SW BGATE SPIN SENSE BAT1 BAT2 VSET PGND 0.015 µF 22 µF 0.1 µF 10 µF 35V Al AC ADAPTER INPUT SMART BATTERY INTB SMBus TO HOST SCL SDA 1759 F01 + + APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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Similar Description - LTC1759 |
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