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HTC LM1117GS-1.8
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HTC LM1117GS-1.8
- Type
- HTC
- Minimum package
- 2500
Technical parameters
- Electronic Component
- 1.3V@(1A)
- Electronic Component
- HTC
- Electronic Component
- 100uV
- Electronic Component
- LM1117GS-1.8
- Electronic Component
- 1
- Package
- SOT-223-3L
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.25g
- Electronic Component
- 1
- Electronic Component
- BM0231131100
- Operating Temperature
- 40℃~+125℃@(Tj)
- Operating Voltage
- 12V
- Output
- Electronic Component
- Output Voltage
- 1.8V
- Output Current
- 1A
- Output Type
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM1117GS-1.8 产品概述
一、主要参数
LM1117GS-1.8 为固定输出线性稳压器（LDO），输入工作电压为 12V，输出电压 1.8V，最大输出电流 1A。主要电气参数包括：电源纹波抑制比（PSRR）75dB@120Hz，输出噪声约 100µV，压差（dropout）1.3V@1A。器件为单路正输出，工作结温范围 -40℃ ~ +125℃（Tj）。具备过热保护与过流保护，提升系统可靠性。
二、关键特性与优势
- 高 PSRR（75dB@120Hz）：对交流电源纹波具有良好抑制能力，适合对噪声敏感的模拟或射频前端供电。
- 低输出噪声（约100µV）：适合精密模数转换器、基带处理器等场合。
- 内建保护功能：过热（OTP）与过流（OCP）保护在异常工况下有效限制器件损坏并实现自动恢复。
- 简单易用：固定输出、单通道设计便于快速集成于常见电源方案。
三、典型应用场景
适用于便携设备、工业控制、通信终端、单片机和 DSP 核心电源、模拟信号链和传感器供电等需要稳定 1.8V 低压电源的场合。
四、热设计与功耗考虑
在最大工作点（Vin=12V，Iout=1A）时，器件功耗 Pd ≈ (12V − 1.8V) × 1A = 10.2W。此功耗非常高，必须重视散热设计：建议使用合适散热片、加大 PCB 铜箔面积（热过孔连接至散热层）、并评估结温以确保 Tj ≤ +125℃。对于持续高电流工作，应考虑采用降压转换器前级降压或将输入电压降低以减少直流功耗。
五、布局与外围元件建议
- 输入侧：在器件输入引脚附近放置 10µF（或更大）低等效串联电阻（ESR）电容，减少输入阻抗并提高瞬态响应。
- 输出侧：LM1117 系列对输出电容稳定性敏感，推荐使用 10µF 以上的低 ESR 电容（钽电容或专用陶瓷加串联电阻的组合），并靠近输出引脚摆放。
- 布线：输入、输出和地线应尽量短且宽，地线采取单点回流或短路径回流，避免噪声耦合到敏感电路。
- 保护：若系统允许，可在输入端增加熔断器或热熔断元件，在输出端加上限流或软启动电路优化启动行为。
六、选型建议与注意事项
- 若系统持续输出大电流且输入–输出压差较大，优先考虑采用开关降压模块以降低器件发热和整体系统损耗。
- 在高温或受限散热条件下，应做热仿真并保证器件在最坏工况下不会进入热关断循环。
- 确认所选封装的热阻、PCB 散热能力与实际机械安装方式匹配负载需求。
- 推荐在样机阶段验证纹波、噪声和瞬态响应，确保满足下游电路的电源品质要求。
总结：LM1117GS-1.8 提供稳定、低噪声的 1.8V 输出和可靠的保护功能，适合需高电源品质的低压数字与模拟电路，但在高 Vin 与大电流条件下必须特别重视散热与功耗管理。
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