TI BQ24171RGYR

The bq24171 device is highly integrated stand-alone Li-ion and Li-polymer switched-mode battery charger with two integrated N-channel power MOSFETs. The device offers a constant-frequency synchronous PWM controller with high-accuracy regulation of input current, charge current, and voltage. The bq24171 closely monitors the battery pack temperature and allows charge only in a JEITA profile-compatible window with a lower charge rate at a low temperature and a lower charge voltage at a high temperature. The bq24171 device charges the battery in three phases: preconditioning, constant current, and constant voltage. The bq24171 charges up to 3-series cells with an adjustable cell voltage. The bq24171 charges the battery in three phases: preconditioning, constant current, and constant voltage. The device is adjustable for up to three series Li+ cells. Charge is terminated when the current reaches 10% of the fast charge rate. A programmable charge timer offers a safety backup. The bq24171 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage. The bq24171 features Dynamic Power Management (DPM) to reduce the charge current when the input power limit is reached to avoid overloading the adapter. A highly accurate current-sense amplifier enables precise measurement of input cu

• JEITA-Compatible Battery Temperature Sensing
• 1.6-MHz Synchronous Switched-Mode Charger With 4-A Integrated N-MOSFETs
• Up to 94% Efficiency
• 30-V Input Rating With Adjustable Overvoltage Protection
• 4.5-V to 17-V Input Operating Voltage
• Battery Charge Voltage Adjustable
• Charge Voltage up to 3-Series Cells
• High Integration
• Automatic Power Path Selector Between Adapter and Battery
• Dynamic Power Management
• Integrated 20-V Switching MOSFETs
• Integrated Bootstrap Diode
• Internal Loop Compensation
• Internal Digital Soft Start
• Safety Thermal Regulation Loop Throttles Back Current to Limit TJ=120°C
• Thermal Shutdown
• Battery Thermistor Sense
• Hot/Cold Charge Suspend and Battery Detect Input
• Overvoltage Protection With Programmable Threshold
• Cycle-by-Cycle Current Limit Accuracy
• ±0.5% Charge Voltage Regulation
• ±4% Charge Current Regulation
• ±4% Input Current Regulation
• Less Than 15μA Battery Current With Adapter Removed
• Less Than 1.5mA Input Current With Adapter Present and Charge Disabled
• Small QFN Package
• 24-Pin, 5.5-mm × 3.5-mm QFN Package

• Tablet PCs
• Netbooks and Ultra-Mobile Computers
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Backup Systems