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UMW LM317LD
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- UMW LM317LD
- Type
- UMW
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- UMW
- Electronic Component
- 0.003%Vout
- Electronic Component
- LM317LD
- Electronic Component
- 1
- Package
- SOP-8
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.15g
- Electronic Component
- 1
- Electronic Component
- BM0228273209
- Operating Temperature
- 40℃~+105℃@(Tj)
- Operating Voltage
- 40V
- Output
- Electronic Component
- Output Voltage
- 1.2V~37V
- Output Type
- Electronic Component
- Output Channel Count
- 1
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM317LD 可调线性稳压器（UMW 友台半导体）
一、产品简介
UMW（友台）LM317LD 是一款单通道正输出可调线性稳压器，输入允许最高工作电压40V，输出电流最高100mA，输出电压可在1.2V～37V范围连续调节。器件集成热关断和过流保护，适用于需要简单、低噪声、高抑制比的电源后端调节场景。
二、主要特性
- 可调输出：1.2V ～ 37V（单通道）
- 最大输出电流：100mA
- 工作电压范围：最高40V
- 保护功能：热关断、限流/过流保护
- PSRR：65dB @ 120Hz（优良的纹波抑制）
- 噪声：0.003% Vout（低噪声）
- 工作结温：-40℃ ～ +105℃（Tj）
- 封装：SOP-8，便于贴片应用
三、电气与设计要点
LM317LD 采用带参考电压和误差放大的可调型拓扑，输出由外部两个电阻决定，基本计算公式为： Vout = Vref × (1 + R2/R1) + Iadj × R2 其中 Vref 典型值约为 1.2V（具体以器件规格书为准），Iadj 较小，计算时可视情况忽略或按规格书给定值修正。为保证稳压器稳定工作，应按规格书选择合适的输入/输出电容和 ESR。
四、典型应用场景
- 开关电源的后级精密滤波与调节
- 仪表、传感器供电（需要低噪声、良好 PSRR）
- 工业控制模块、通信设备的局部稳压
- 原型验证、实验平台的可调电源
五、实际使用建议
- 散热与功耗：线性稳压器的功耗为 (Vin − Vout) × Iout。在最大输入电压与较大电流下，器件耗散功率可能很高，SOP-8 封装散热能力有限，使用时必须评估结温并加用散热或降低功耗。
- 输出电容：为保证稳定性及瞬态响应，建议并联适当的低 ESR 输出电容，具体容量与 ESR 参考规格书或评估板设计。
- 保护与滤波：若输入侧有较大纹波或反向电流风险，建议增加输入滤波电容和反向保护器件（如二极管）。
- PCB 布局：输入/输出电容靠近器件引脚布置，散热铜箔尽量扩大并与热焊盘相连，以降低结温。
六、封装与可靠性
SOP-8 贴片封装适合批量 SMT 装配，便于工业化生产。器件在 -40℃ 到 +105℃ 工作结温区间内保持可靠性，但长期高温或功率过大时需要注意热退化与热保护触发。
七、选型与替代
当系统需要更高输出电流或更低压差（dropout）时，可考虑专用低压差 LDO 或更高功率封装型号；若追求更高效率，应优先考虑开关电源方案。本器件适合对噪声和纹波抑制有较高要求但功率损耗可接受的场合。
总结：LM317LD（UMW）以其宽输入电压、可调输出和完善保护功能，适用于多种需要低噪声、高 PSRR 的线性稳压场合。具体参数、典型应用电路与外部元件选择，请以官方规格书为准并在实际设计中进行热与稳定性验证。
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