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
BQ24745 描述
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, 5×5 mm2 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
|
BQ24745 |
| # Series Cells |
1-4 |
| Charge Status Outputs |
1 |
| Control Topology |
Switchmode |
| Switching Frequency(kHz) |
300 |
| Primary Charge Termination Method |
Host Controlled |
| Pin/Package |
28VQFN |
| Vin(Max)(V) |
24 |
| Battery Charge Voltage(V) |
19.2 |
BQ24745 特性
- 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
BQ24745 芯片订购指南
| 器件 |
状态 |
温度 (oC) |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| BQ24745RHDR |
ACTIVE |
0 to 125 |
2.90 | 1ku |
VQFN (RHD) | 28 |
3000 | LARGE T&R |
|
| BQ24745RHDRG4 |
ACTIVE |
0 to 125 |
2.90 | 1ku |
VQFN (RHD) | 28 |
3000 | LARGE T&R |
|
| BQ24745RHDT |
ACTIVE |
0 to 125 |
3.35 | 1ku |
VQFN (RHD) | 28 |
250 | SMALL T&R |
|
| BQ24745RHDTG4 |
ACTIVE |
0 to 125 |
3.35 | 1ku |
VQFN (RHD) | 28 |
250 | SMALL T&R |
|
BQ24745 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| BQ24745RHDR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24745RHDR |
BQ24745RHDR |
| BQ24745RHDRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24745RHDRG4 |
BQ24745RHDRG4 |
| BQ24745RHDT |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24745RHDT |
BQ24745RHDT |
| BQ24745RHDTG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24745RHDTG4 |
BQ24745RHDTG4 |
BQ24745 应用技术支持与电子电路设计开发资源下载
- BQ24745 数据资料 dataSheet 下载.PDF
- TI 德州仪器电池管理产品选型与价格 . xls
- 照明和显示屏电源选择指南 (PDF 1427 KB)
- QFN Layout Guidelines (PDF 1279 KB)
- 笔记本电脑指南 (Rev. A) (PDF 2774 KB)
- 全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A)
(PDF 2206 KB)
- PowerPADTM Made Easy (PDF 57 KB)
- 标准线性产品交叉参考 (Rev. D)
(PDF 1058 KB)
- 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
- 所选封装材料的热学和电学性质 (PDF 645 KB)
- 高速数据转换 (PDF 1967 KB)
BQ24745 相关工具