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ETA ETA9742E8A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- ETA ETA9742E8A
- Type
- ETA
- Minimum package
- 4000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- ETA
- Electronic Component
- ETA9742E8A
- Electronic Component
- 1
- Package
- ESOP8
- Electronic Component
- Battery Management
- Electronic Component
- 0.164g
- Electronic Component
- 1
- Features
- Programmable Current
- Electronic Component
- BM0258858416
- Operating Temperature
- 40℃~+85℃
- Operating Voltage
- 4.5V~5.5V
- Battery Type
- Battery
- Battery
- 1
- ICType
- IC
- and Voltage
- 4.21V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
ETA9742E8A 产品概述
一、产品简介
ETA9742E8A 是钰泰（ETA）推出的一款单节锂电池充电管理芯片，适配 USB 或同类 5V 电源供电场景。芯片工作电压范围为 4.5V～5.5V，最高充电电流可达 3A，采用 ESOP8 封装，面向需高效率、体积受限的便携设备与移动电源等应用。
二、主要性能参数
- 芯片类型：充电芯片（单节锂离子/锂聚合物）
- 输入工作电压：4.5V ～ 5.5V
- 最大充电电流：3A（可通过外部元件设定或限制）
- 充电饱和电压：4.21V（终止或恒压阶段目标电压）
- 放电截止电压：3.2V（电池保护或系统判断的下限）
- 电池节数：1 节
- 工作温度：-40℃ ～ +85℃
- 电池温度检测：不支持（无内部热敏输入）
- 封装：ESOP8
三、充电管理与结束策略
ETA9742E8A 适配常见的 CC/CV（恒流/恒压）充电流程：在恒流阶段以设定电流快速充电，当电池电压接近 4.21V 时进入恒压阶段并逐步降低充电电流直至达到终止条件（通常由终止电流或时间判断）。由于芯片不支持电池温度检测，设计时应通过外部措施（温度传感器或系统级安全策略）补充温度监控。
四、保护与可靠性建议
芯片规格本身适用于常规充电保护要求，但建议在系统中加入下列外部保护元件以提高可靠性与安全性：输入过压/欠压保护、反接保护、限流/熔断器、USB 数据线限流以及电池短路保护。考虑到 3A 充电电流会带来较大功耗与发热，应关注热设计与散热路径。
五、封装与热设计要点
ESOP8 封装便于焊接与系统集成，但在高电流工况下需做好 PCB 散热设计：
- 为芯片散热引脚和电源回路预留较大铜箔面积；
- 在芯片下方或附近布置热过孔，连通多层铜层散热；
- 将电流感测电阻、电感或 MOSFET 等高发热元件靠近布局并保证良好散热；
- 输入与电池端各放置足够的去耦电容以稳定电源并抑制纹波。
六、典型应用场景
适用于单节锂电的便携设备，如移动电源（单节设计或作为模块）、蓝牙音箱、小型智能硬件、便携式测量仪器及其他需要 1 节电池、较高充电电流的消费电子产品。
七、选型与注意事项
在选型与设计时注意：
- 确认系统供电稳定在 4.5V～5.5V 范围，USB 或适配器应能提供足够电流头寸；
- 若应用需电池温度监测或更细致的安全策略，应额外加入温度传感器与相应 MCU 管理；
- 高 3A 充电电流对 PCB、连接器与电池单体有更高要求，请选用合适规格的线材与连接器并验证电池的最大充放电能力；
- 参考厂商规格书与应用笔记，按推荐外围电路与布局实践完成原理图与 PCB 设计。
总体而言，ETA9742E8A 提供了在紧凑封装下的高电流单节充电解决方案，适合对充电速度与系统体积有较高要求的产品。请以官方数据手册为准进行最终电气与热设计验证。
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