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TWGMC LM2576S-12 Converter LM2576S
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TWGMC LM2576S-12
- Type
- TWGMC
- Minimum package
- 500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TWGMC
- Electronic Component
- LM2576S-12
- Electronic Component
- 1
- Package
- TO-263-5
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 2.03g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0226983061
- Operating Temperature
- 40℃~+125℃
- Operating Voltage
- 7V~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、主要特性
LM2576S-12 为固定输出 12V 的降压型开关稳压器，典型参数如下：输入电压范围 7V～40V，最大输出电流 3A，开关频率约 52kHz；为非同步整流拓扑（需外接整流二极管），内部集成开关晶体管；静态电流（Iq）约 5mA，工作温度范围 -40℃ 至 +125℃；单通道输出，TO-263-5 封装。该器件适合需要中等电流和较宽输入电压范围的降压电源设计，效率高、外部元件简单。
二、典型应用场景
适用于工业与汽车电子、通信设备、工控模块、电源模块和分布式电源等场合。尤其在输入电压波动较大（如汽车电源或电池组）但需稳定 12V 输出的场景中具有优势。由于静态电流较低，也适合半持续运行或需一定待机效率的系统。
三、典型电路与外部元件要求
LM2576S-12 为非同步降压，典型外部元件包含：功率电感（建议电感电流额定 >3A，适当选择饱和电流裕量）、肖特基整流二极管（须满足反向耐压 > 输入最大电压、平均电流 ≥3A）、输入与输出旁路电容（低等效串联电阻 ESR 的电解或固体电容结合陶瓷旁路以稳定环路并抑制纹波）。此外需根据 datasheet 提供的参考设计选择电感值与电容数值以保证稳定性与低纹波。
四、封装与热管理
TO-263-5（类似 D2PAK）封装有良好的散热能力，但在大电流输出与高压差条件下仍需注意热设计。建议在 PCB 上留足铜箔散热面积、通过多层铜箔和热过孔将热量引导至散热层或大面积接地平面。考虑到 3A 输出和器件功耗，必要时在布局中增加散热片或采用更大面积铜箔以避免过热并延长可靠性。
五、设计注意事项
- 输入电压最低需高于输出电压加上器件最低压差（数据手册规定），对于 12V 输出推荐至少 7V 输入以保证稳压余量。
- 严格按参考电路布置高电流回路，减小环路面积以降低 EMI 与纹波。
- 选用低 ESR 输出电容以降低输出纹波并提高瞬态响应。
- 肖特基二极管选择要注意反向耐压与平均电流及散热，必要时加大封装或采用并联设计。
- 若需启用关断功能（Shutdown），确认外部开/关控制电平与器件兼容；长期停机或低功耗模式下关注静态电流对系统的影响。
六、选型与替代建议
LM2576S-12 提供了简单、可靠的 12V/3A 降压解决方案。若应用对效率或开关频率有更严格要求，可考虑同步降压器以降低整流损耗；若体积或 EMI 要求更高，可选择高频率开关器件以减小电感体积。品牌信息：TWGMC（台湾迪嘉）封装形式 TO-263-5，选型时请参考其技术规格书与封装图，确保与电路板 footprint、热管理方案匹配。
总结：LM2576S-12 在宽输入电压和中等电流输出场景下具有良好性价比，外部元件简单、设计门槛低，适合作为标准 12V 模块的核心器件。
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