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LRC LR1117DS33X
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- LRC LR1117DS33X
- Type
- LRC
- Minimum package
- 4000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 1.3V@(1A)
- Electronic Component
- LRC
- Electronic Component
- LR1117DS33X
- Electronic Component
- 1
- Package
- SOT-223
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.267g
- Electronic Component
- 1
- Features
- Electronic Component
- Electronic Component
- BM0228535953
- Operating Temperature
- 20℃~+125℃@(Tj)
- Operating Voltage
- 15V
- Output
- Electronic Component
- Output Voltage
- 3.3V
- Output Current
- 1A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LR1117DS33X 产品概述
一、产品简介
LR1117DS33X 是乐山无线电（LRC）推出的一款固定输出 3.3V 线性低压差稳压器（LDO），采用 SOT-223 封装，面向对稳定电源、有一定输出电流需求且关注成本与布局简便性的应用。器件集成过热保护，便于在异常工况下自我保护，适用于板载电源管理和单芯片供电场合。
二、主要电气参数
- 输出电压：固定 3.3V（正极输出）
- 最大输出电流：1A
- 静态电流（Iq）：典型 2mA（静态工作电流，低功耗特性有利于待机）
- 压差（Dropout）：1.3V @ 1A（满载时输入电压需高于输出电压约 1.3V）
- 工作电压（输入允许范围）：最高 15V（设计时应保证 Vin ≥ Vout + 压差）
- 电源纹波抑制比（PSRR）：60dB @ 120Hz（对 120Hz 工作频段有良好抑制性能）
- 特性：过热保护（Thermal Shutdown）
- 工作温度：-20℃ ~ +125℃（Tj）
三、封装与热管理
器件采用 SOT-223 封装，便于通过 PCB 铜箔进行散热。SOT-223 对于中等功耗（数百毫瓦到几瓦）有较好热性能，但在高压差或接近 1A 输出时，功耗显著增长（P = (Vin - 3.3V) × Iout），需做好散热设计与封装热阻评估，建议增加散热铜箔或使用热焊盘，并在 PCB 布局时为引脚与散热面留足面积。
四、典型应用场景
- 单片机、MCU、FPGA 等板载 3.3V 供电
- 工业控制、电源模块、仪表等需要可靠供电的系统
- 通信终端、消费类电子的本地稳压电源
- 需过热保护及中等 PSRR 的模拟/数字混合电路
五、设计与使用建议
- 输入电压选择：在 1A 输出时，输入电压至少为 3.3V + 1.3V ≈ 4.6V；若使用更高输入（接近 15V），应评估功耗与温升。
- 输出电容：为确保稳压器稳定工作并达到厂商指定响应，建议在输出端并联适当电容（参照典型应用电路或厂商推荐值），并注意电容 ESR 对稳定性的影响。
- 热保护配合：过热保护能在过温时保护芯片，但不代替良好散热设计；长期可靠性依赖于控制结温（Tj）在安全范围内。
- 滤波与布局：输入端增设滤波电容有助于提高 PSRR 表现，降低纹波传递至输出；输入/输出走线尽量短并与敏感信号隔离。
六、总结
LR1117DS33X 为一款结构简单、性能均衡的 3.3V 固定输出 LDO，适合要求中等电流（最高 1A）、需要过热保护且关注成本与布局便捷性的应用。设计时重点关注输入电压裕量与散热处理，以保证在不同工况下的稳定与可靠运行。若需获得更详细的典型曲线、外部元件推荐与典型应用电路，建议参考厂商完整数据手册。
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