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ETA ETA2845S2G
Configuration
1 options
Configuration
24+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- ETA ETA2845S2G
- Type
- ETA
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- ETA
- Electronic Component
- ETA2845S2G
- Electronic Component
- 1
- Package
- SOT-23-6
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.05g
- Electronic Component
- 1
- Features
- Electronic Component
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0258858410
- Operating Temperature
- 40℃~+85℃@(TA)
- Operating Voltage
- 5V~38V
- Switching Frequency
- 700kHz
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
ETA2845S2G 产品概述
一、器件概述
ETA2845S2G 为钰泰（ETA）推出的一款降压型开关稳压器，采用降压（buck）拓扑、内置功率开关与同步整流，输入电压范围宽（5V～38V），输出电流可达400mA，开关频率约700kHz，输出可调，器件封装为SOT-23-6，工作环境温度范围为 -40℃～+85℃（TA）。该器件定位于空间受限、需高转换效率与中等负载电流的点对点电源应用。
二、主要特性
- 宽输入电压：5V～38V，适应各种车载与工业供电场景。
- 内置开关管与同步整流：无需外置肖特基二极管，降低整流损耗、提高效率。
- 中高开关频率（≈700kHz）：使外部电感、电容体积更小，有利于紧凑尺寸设计。
- 单路可调输出，最大输出电流400mA；SOT-23-6小封装，便于批量贴装。
- 适用温度范围覆盖常见工业与消费类环境（-40℃~+85℃）。
三、典型应用
- 车载辅助电源、汽车电子外设（需注意更严苛的车规验证）
- 工业控制模块、电源管理与工业通信设备
- 手持/便携设备、无线基站的点负载电源
- 摄像头模组、传感器供电与IoT终端电源
四、设计要点与建议
- 电感选择：由于工作频率较高，建议选择低DCR、饱和电流高于负载峰值的功率电感。为保证纹波与响应，可优先考虑大约4.7µH～10µH量级（视输出电压与纹波要求调整）。
- 输出电容：优先采用X5R/X7R钽电容或陶瓷电容以降低ESR，提高瞬态响应；典型并联容量在10µF～100µF范围内，根据纹波与稳定性调节。
- 反馈网络：通过外部分压电阻设定输出电压（Vout = Vref × (1 + Rtop/Rbot)），建议分压阻值总和在几十千欧以内以兼顾抗干扰与功耗。
- 布局注意事项：输入侧大电流回路及开关结点（SW）应尽量缩短走线；输入与输出电容尽量靠近器件引脚放置；为散热保留足够铜箔面积。
- 热管理：SOT-23-6 封装散热有限，高负载与高环境温度下应关注器件结温；必要时扩大PCB散热铜箔或降低占空比/负载。
五、可靠性与保护建议
虽器件内建同步整流与相关控制电路，但在系统级设计应考虑输入反向保护、过流保护与过温保护措施。选型时，确保外部电感与电容的额定电流与耐压满足安全裕度，避免长时间在额定极限工作。
六、总结
ETA2845S2G 以其宽输入电压、高达700kHz的工作频率、内置开关与同步整流，以及SOT-23-6小型封装，适合对体积和效率有较高要求的点对点降压电源场景。具体电路实现时建议参考芯片完整数据手册，按推荐外设与PCB布线规则进行布局与验证，以确保性能与可靠性达到设计目标。
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