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UMW LM2576S-12 LM2576S
Configuration
1 options
Configuration
Electronic Component
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- UMW LM2576S-12
- Type
- UMW
- Minimum package
- 800 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- UMW
- Electronic Component
- LM2576S-12
- Electronic Component
- 1
- Package
- TO-263-5
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0266030384
- Operating Temperature
- 40℃~+125℃@(TJ)
- Operating Voltage
- 15V~40V
- Switching Frequency
- 52kHz
- Electronic Component
- Electronic Component
- Output Voltage
- 12V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM2576S-12 产品概述
一、概述
UMW（友台半导体）生产的 LM2576S-12 是一款降压型固定输出 DC-DC 电源芯片，输入电压范围 15V～40V，固定输出 12V，额定输出电流 3A，开关频率约 52kHz。芯片集成开关管（内置）、非同步整流设计，静态电流仅 50µA，工作结温范围 -40℃～+125℃（TJ）。封装为 TO-263-5，适合需要中等功率且对结构可靠性有要求的电源方案。
二、主要特性
- 固定输出 12V，单通道降压拓扑
- 输入电压宽范围：15V～40V，适应大多数车载与工业电源场景
- 连续输出电流可达 3A，内置功率开关，简化外部元件
- 开关频率约 52kHz，兼顾效率与元件体积
- 非同步整流：需外接低压降肖特基二极管
- 超低静态电流（Iq ≈ 50µA），利于轻载与待机节能
- 工业级工作温度与 TO-263-5 热性能，利于散热设计
三、电气设计要点
- 由于为非同步整流器，必须选用低正向压降、高速肖特基二极管作为续流元件，以降低整流损耗与发热。
- 选择输出滤波电感与电容时，应参考厂家资料以满足纹波、峰值电流与 ESR 要求。开关频率 52kHz 意味所选电感与电容在体积与性能上有较大灵活性。
- 静态电流低，使芯片在轻载或待机时损耗小，但要留意启动与瞬态响应特性，必要时增加输出滤波或软启动措施。
四、热管理与封装
TO-263-5 封装具有良好散热路径，但在高电流或高压差（Vin - Vout）工况下仍需采取散热措施：
- 在 PCB 布局上安排宽铜箔散热区并焊接到地平面或散热铜箔；
- 必要时在芯片底部或后侧加装散热片或强制风冷；
- 评估最大功耗与结温，确保在最坏工况下结温不超过额定 TJ。
五、应用建议与注意事项
- 适用于车载电源、工业控制、嵌入式系统及其他 12V 总线供电场景。
- 严格遵循数据手册中关于输入旁路电容、输出电容及回路布线的建议，尽量缩短高电流回路（开关节点、肖特基、电感）走线以降低 EMI。
- 考虑输入瞬态和浪涌，应在输入端视情况增加 TVS 或滤波器以保护芯片。
六、总结
LM2576S-12（UMW）以其宽输入范围、3A 输出能力、低静态电流和成熟的降压拓扑，适合要求可靠性与成本可控的中功率 DC-DC 设计。合理的外围器件选型与良好的 PCB 热/走线设计是获得高效率与稳定性的关键。若需量产设计，请结合 UMW 的完整数据手册进行参数验证与热仿真。
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