bq24745 Datasheet | Texas Instruments

FEATURES - NMOS-NMOS Synchronous Buck Converter with 300-k Hz Frequency and >95% Efficiency - 30-ns Minimum Driver Dead-Time and 99.5% Maximum Effective Duty Cycle - High-Accuracy Voltage and Current Regulation - ±0.5% Charge Voltage Accuracy - ±3% Charge Current Accuracy - ±3% Adapter Current Accuracy - ±2% Input Current Sense Amp Accuracy - Integration - Input Current parator, With Adjustable Threshold and Hysteresis - Internal Soft-Start - Safety - Dynamic Power Management (DPM) - Up to 19.2-V Battery Voltage - 7-V- 24-V AC/DC-Adapter Operating Range - Simplified SMBus Control Interface - Charge Voltage DAC (1.024 V- 19.2 V) - Charge Current DAC (128 m A- 8.064 A) - Adapter Current Limit DPM DAC (256 m A- 11.008 A) - Status and Monitoring Outputs - AC/DC Adapter Present With Adjustable Voltage Threshold - Input Current parator With Adjustable Threshold and Hysteresis - Current Sense Amplifier for Current Drawn From Input Source - Charge Any Battery Chemistry: Li+, Ni Cd, Ni MH, Lead Acid, Etc. - Charge Enable Pin - < 10-μA Battery Current With Adapter Removed - < 1-m A Input DCIN Current With Adapter Present and Charge Disabled - 28-Pin, 5-mm × 5-mm QFN Package APPLICATIONS - Notebook and Ultra-Mobile puters - Portable Data-Capture Terminals - Portable Printers - Medical Diagnostics Equipment - Battery Bay Chargers - Battery Backup Systems DESCRIPTION The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current parator, offering low ponent count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package. CSSP CSSN ICOUT BOOT UGAT PHAS...