BQ24751B 采用 5x5 QFN 封装的多节同步开关模式充电器
BQ24751B 描述
The bq24751B is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows gor high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.
The bq24751B charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin QFN package.
The bq24751B controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and to connect the battery to the system using 6-V gate drives for better system efficiency
|
BQ24740 |
BQ24750A |
BQ24751B |
BQ24753 |
BQ24753A |
| # Series Cells |
2-4 |
2-4 |
2-4 |
2-4 |
2-4 |
| Charge Status Outputs |
1 |
1 |
1 |
1 |
1 |
| Control Topology |
Switchmode |
Switchmode |
Switchmode |
Switchmode |
Switchmode |
| Switching Frequency(kHz) |
300 |
300 |
300 |
300 |
300 |
| Primary Charge Termination Method |
Host Controlled |
Host Controlled |
Host Controlled |
Host Controlled |
Host Controlled |
| Pin/Package |
28VQFN |
28VQFN |
28VQFN |
28VQFN |
28VQFN |
BQ24751B 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
- Automatic System Power Selection From AC/DC Adapter or Battery
- Internal Loop Compensation
- Internal Soft Start
- Safety
- Programmable Input Overvoltage Protection (OVP)
- Fast Dynamic Power Management (DPM)
- Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits
- Reverse-Conduction Protection Input FET
- 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)
BQ24751B 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 |
| BQ24751BRHDR |
ACTIVE |
-40 to 85 |
2.50 | 1ku |
VQFN (RHD) | 28 |
3000 | LARGE T&R |
|
| BQ24751BRHDT |
ACTIVE |
-40 to 85 |
2.90 | 1ku |
VQFN (RHD) | 28 |
250 | SMALL T&R |
|
BQ24751B 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 |
| BQ24751BRHDR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24751BRHDR |
BQ24751BRHDR |
| BQ24751BRHDT |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ24751BRHDT |
BQ24751BRHDT |
BQ24751B 应用技术支持与电子电路设计开发资源下载
- BQ24751B 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)
BQ24751B 相关工具
