BQ24745是TI公司的一款电池充电器IC产品，BQ24745是具有输入电流检测比较器的 SMBus 控制的 2 级多化合物电池充电器，本页介绍了BQ24745的产品说明、应用、特性等，并给出了与BQ24745相关的TI元器件型号供参考。
BQ24745 - 具有输入电流检测比较器的 SMBus 控制的 2 级多化合物电池充电器 - 电池充电器IC - 电池管理产品 - TI公司（Texas Instruments，德州仪器）
The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component 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.
The bq24745 features dynamic power management (DPM) and input power limiting. These features reduce battery-charge current when the input power limit is reached to avoid overloading the ac adaptor when supplying the load and the battery charger simultaneously. A highly accurate current-sense amplifier enables precise measurement of input current from the ac adapter, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.
- NMOS-NMOS Synchronous Buck Converter with 300-kHz 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 Comparator, 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 mA–8.064 A)
- Adapter Current Limit DPM DAC (256 mA–11.008 A)
- Status and Monitoring Outputs
- AC/DC Adapter Present With Adjustable Voltage Threshold
- Input Current Comparator With Adjustable Threshold and Hysteresis
- Current Sense Amplifier for Current Drawn From Input Source
- Charge Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, Etc.
- Charge Enable Pin
- < 10-µA Battery Current With Adapter Removed
- < 1-mA Input DCIN Current With Adapter Present and Charge Disabled
- 28-Pin, 5-mm × 5-mm QFN Package
