BQ24721C Smart Battery Charger with SMBus and System Power Selector, Softer Turn-On
|
BQ24721C |
| # Series Cells |
3-4 |
| Charge Status Outputs |
1 |
| Control Topology |
Switchmode |
| Switching Frequency(kHz) |
300 or 500 |
| Primary Charge Termination Method |
Host Controlled |
| Pin/Package |
32QFN |
BQ24721C 描述
The bq24721 is a high efficiency synchronous battery pack charger with high level of integration for portable applications. This device implements a high performance analog front-end that interfaces to the system power management micro-controller through a simplified SBS-like SMBus interface.
The dynamic power management (DPM) function modifies the charge current depending on system load conditions, avoiding ac adapter overload.
High accuracy current sense amplifiers enable accurate measurement of either the charge current or the ac adapter current, allowing termination of nonsmart packs and monitoring of overall system power.
The adapter isolation diode can be bypassed or entirely replaced with an external MOSFET using a control signal provided by the bq24721, thus reducing overall power dissipation
BQ24721C 特性
- High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz or 500 kHz frequency
- bq24721C Offers Softer Turn-On, Stronger Turn-Off
- SBS-Like(1) SMBus Interface for Control and Status Communications With Host
- Programmable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface
- 0.4% Charge Voltage Regulation Accuracy
- 3% Charge Current Regulation Accuracy
- 3% Adapter Current Regulation Accuracy Dynamic Power Management (DPM)
- 2% Accuracy Integrated Charge and AC Adapter 20× Current Amplifier Output
- 3-Cell and 4-Cell Li-Ion Voltage Regulation 9 V, 12 V-14.4 V, 16 V-19.2 V
- Battery Pack Voltage Operating Range 0 V-19.2 V
- AC Adapter Operating Range 8 V-28 V
- 99.5% Max Duty Cycle
- Internal Soft Start
- Integrated 5% 5-V LDO When AC Adapter Applied
- 6-V Drive Supply Voltage for Increased Efficiency
- Reverse Battery to Adapter Discharge Protection
- Battery/Adapter to System Power Selector Function
- Charge and Adapter Overcurrent Protection
- Battery Thermistor Sense, TS, Comparators
- Available in 32-Pin 5x5-mm QFN Package
BQ24721C 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 |
| BQ24721CRHBR |
ACTIVE |
-40 to 85 |
2.70 | 1ku |
QFN (RHB) | 32 |
3000 | LARGE T&R |
|
| BQ24721CRHBRG4 |
ACTIVE |
-40 to 85 |
2.70 | 1ku |
QFN (RHB) | 32 |
3000 | LARGE T&R |
|
| BQ24721CRHBT |
ACTIVE |
-40 to 85 |
3.15 | 1ku |
QFN (RHB) | 32 |
250 | SMALL T&R |
|
| BQ24721CRHBTG4 |
ACTIVE |
-40 to 85 |
3.15 | 1ku |
QFN (RHB) | 32 |
250 | SMALL T&R |
|
BQ24721C 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 |
| BQ24721CRHBR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24721CRHBR |
BQ24721CRHBR |
| BQ24721CRHBRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24721CRHBRG4 |
BQ24721CRHBRG4 |
| BQ24721CRHBT |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24721CRHBT |
BQ24721CRHBT |
| BQ24721CRHBTG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24721CRHBTG4 |
BQ24721CRHBTG4 |
BQ24721C 应用技术支持与电子电路设计开发资源下载
- BQ24721C 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)
BQ24721C 相关工具
| 名称 |
型号 |
公司 |
工具/软件类型 |
| BQ24721 评估模块 |
BQ24721EVM |
Texas Instruments |
开发电路板/EVM |
| 用于电池电量监测评估的、基于 USB 的 PC 接口板 |
EV2300 |
Texas Instruments |
开发电路板/EVM |