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LTC4100EG Datasheet(PDF) 1 Page - Linear Technology |
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LTC4100EG Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LTC4100 1 sn4100 4100is 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. s Single Chip Smart Battery Charger Controller s 100% Compliant (Rev. 1.1) SMBus Support allows for Operation with or without Host s SMBus Accelerator Improves SMBus Timing* s Wide Output Voltage Range: 6.4V to 26V s Hardware Interrupt and SMBAlert Response Eliminate Interrupt Polling s High Efficiency Synchronous Buck Charger s 0.5V Dropout Voltage; Maximum Duty Cycle > 98% s AC Adapter Current Limit Maximizes Charge Rate s ±0.8% Voltage Accuracy; ±5% Current Accuracy s Up to 4A Charging Current Capability s 10-Bit DAC for Charge Current Programming s 11-Bit DAC for Charger Voltage Programming s User-Selectable Overvoltage and Overcurrent Limits s High Noise Immunity SafetySignal Sensor s Small 24-Pin Narrow (0.209") SSOP Package APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO Smart Battery Charger Controller July 2003 The LTC ®4100 Smart Battery Charger is a single chip charging solution that dramatically simplifies construc- tion of an SBS compliant system. The LTC4100 imple- ments a Level 2 charger function whereby the charger can be programmed by the battery or by the host. A SafetySignal 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 SafetySignal status (via the ChargerStatus command). 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 current. When supplying system load current, charging current is automatically reduced to prevent adapter over- load.** , LTC and LT are registered trademarks of Linear Technology Corporation. s Portable Instruments and Computers s Data Storage Systems and Battery Backup Servers Figure 1. 4A Smart Battery Charger VDD DCDIV CHGEN ACP SMBALERT SCL SDA THB THA ILIM VLIM IDC DCIN INFET CLP CLN TGATE BGATE PGND CSP BAT VSET ITH GND 17 11 6 10 7 9 8 15 16 13 14 20 5 4 24 23 1 3 2 21 22 18 19 12 LTC4100 3V TO 5.5V 0.12 µF 0.1 µF 0.082 µF 0.1 µF 0.01 µF 0.0015 µF 6.04k 10k 54.9k 100 Ω 0.033 Ω 20 µF 20 µF 0.1 µF 10 µH 0.025 Ω SMBCLK 5k SMBDAT SMBCLK SMBDAT DCIN 4100 TA01 CHGEN SMBALERT# ACP SMART BATTERY 1.13k 1.21k 13.7k SafetySignal *U.S. Patent No. 6,650,174 **U.S. Patent No. 5,723,970 |
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