BQ24704 具有低 Iq 的低成本、主机控制锂离子和锂聚合物电池充电器
BQ24704 描述
The bq24704 is a high-efficiency, synchronous battery charger with integrated compensation offering low component count for space-limited Li-Ion and Li-Polymer battery charging applications. Charge current and voltage programming allows high regulation accuracies, and can be either hardwired with resistors, or programmed by the system power-management microcontroller using a DAC or GPIOs.
The bq24704 charges two, three, or four series Li+ cells, supporting up to 8 A of charge current, and is available in a 24-pin, 4x4-mm thin QFN package.
The bq24704 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 adapter when supplying the load and the battery charger simultaneously.
|
BQ24704 |
| # Series Cells |
2-4 |
| Charge Current(Max)(A) |
up to 8 |
| Charge Status Outputs |
1 |
| Control Topology |
Switchmode |
| Switching Frequency(kHz) |
300 |
| Primary Charge Termination Method |
Host Controlled |
| Pin/Package |
24VQFN |
| Vin(Max)(V) |
30 |
| Battery Charge Voltage(V) |
4 to 4.512 |
| Optional Functions |
Energy Star Low Iq |
BQ24704 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
- Internal Loop Compensation
- Internal Soft-Start
- Safety
- Dynamic Power Management (DPM) with Status Indicator
- Charger Overcurrent Protection
- Battery Overvoltage Protection
- Thermal Shutdown
- Supports Two, Three, or Four Li+ Cells
- 8 — 24 V AC/DC-Adapter Operating Range
- Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
- Charge Voltage (4-4.512 V/cell)
- Charge Current (up to 8 A, with 10-mΩ Sense Resistor)
BQ24704 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 |
| BQ24704RGER |
ACTIVE |
-40 to 125 |
2.20 | 1ku |
VQFN (RGE) | 24 |
3000 | LARGE T&R |
|
| BQ24704RGET |
ACTIVE |
-40 to 125 |
2.55 | 1ku |
VQFN (RGE) | 24 |
250 | SMALL T&R |
|
BQ24704 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 |
| BQ24704RGER |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24704RGER |
BQ24704RGER |
| BQ24704RGET |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24704RGET |
BQ24704RGET |
BQ24704 应用技术支持与电子电路设计开发资源下载
- BQ24704 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)
- PowerPAD™ 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)
BQ24704 相关工具
