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HGSEMI LM7909CS/TR LM7909CS
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HGSEMI LM7909CS / TR
- Type
- HGSEMI
- Minimum package
- 500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- HGSEMI
- Electronic Component
- LM7909CS/TR
- Electronic Component
- 1
- Package
- TO-263-3
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 2.488g
- Electronic Component
- 1
- Electronic Component
- BM0264801296
- Operating Voltage
- 25V
- Output
- Electronic Component
- Output Voltage
- 9V
- Output Current
- 1A
- Output Type
- Electronic Component
- Output Channel Count
- 1
- Static Current(Iq)
- 7.8mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM7909CS/TR 产品概述
一、产品简介
LM7909CS/TR 是华冠（HGSEMI）出品的一款固定输出负电压线性稳压器，额定输出电压为 -9V，适用于需要稳定负电源的小功率到中功率电子设备。器件集成了短路电流限制和热关断等保护功能，可在异常工况下提高系统可靠性。封装采用 TO-263-3（D2PAK），便于表面贴装和散热设计。
二、主要参数
- 输出极性：负极（固定 -9V 输出）
- 工作电压：25V（器件额定工作电压范围，设计时请参考系统最大输入）
- 输出电流：1A（额定输出电流，内部支持超过 1.0A 的短时输出能力）
- 静态电流（Iq）：7.8mA（静态工作电流，系统待机损耗参考）
- 输出电压容差：±4%（典型输出精度）
- 输出通道数：1（单路负电压输出）
- 功能特性：内部短路电流限制、热过载保护、短路保护（自动限流并热关断）
三、保护与可靠性
LM7909CS/TR 内置多重保护机制：当输出被短路或出现过载时，内部电流限制会限制流过芯片的电流，防止器件和负载损坏；当芯片温度超过安全阈值时，热关断功能会自动关闭输出以保护器件，温度恢复后自动重启。这些特性使其在工业、通讯等需要稳健保护的应用中更可靠。
四、封装与散热
TO-263-3（D2PAK）封装利于大面积铜箔散热和焊盘连接。由于输出电流可达 1A 级别，建议在 PCB 设计中：
- 使用大面积散热铜箔（器件底部及背面连接到散热层），并通过过孔连接至多层铜层提高散热能力；
- 如需长期满载运行，考虑外加散热片或优化散热路径；
- 注意焊盘尺寸与热阻匹配，减少结-壳温差。
五、典型应用
- 负电源轨（-9V）供电的模拟前端与运算放大器
- 通信设备与接口电路中的负电压供给
- 测试仪器、传感器偏置电源
- 工业控制板与消费电子辅助负压源
六、设计与使用建议
- 输入与输出端建议并联旁路电容：输入端建议 0.33µF 至 1µF（陶瓷或电解），输出端建议 0.1µF 至 10µF，以保证稳定性与瞬态响应（根据系统需求调整）；
- 确保输入电压高于输出电压至少器件所需的最小压差（请结合具体数据手册确认典型 dropout 值）；
- 布局上尽量将输入电容靠近器件输入脚放置，输出电容靠近输出脚放置，地线采用单点或低阻抗回流设计；
- 关注静态电流（Iq 约 7.8mA）对系统供电和功耗的影响，尤其在电池供电场景下评估待机功耗。
七、订购信息与注意事项
型号：LM7909CS/TR，品牌：HGSEMI（华冠），封装：TO-263-3。订购或设计集成前建议获取完整数据手册确认温度范围、电压差、最大功耗及封装机械尺寸等详细参数。系统级设计中，应考虑输入电压波动、过载情形和散热裕量，确保长期可靠运行。
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