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CJ CJU1117B-3.3 CJU1117B
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ CJU1117B-3.3
- Type
- CJ
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 1.3V@(1A)
- Electronic Component
- CJ
- Electronic Component
- 0.003%Vout
- Electronic Component
- CJU1117B-3.3
- Electronic Component
- 1
- Package
- TO-252-2L
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.47g
- Electronic Component
- 1
- Electronic Component
- BM0227295185
- Operating Temperature
- 40℃~+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.
CJU1117B-3.3 产品概述
一、产品简介
CJU1117B-3.3 为江苏长电（CJ）推出的固定输出型线性稳压器（LDO），输出电压3.3V，最大输出电流1A。器件集成热关断与过流保护，工作结温范围-40℃至+125℃，适用于对噪声与纹波抑制有较高要求的电源前端和点对点稳压场景。
二、主要特点
- 固定输出：3.3V，正极输出
- 输出电流：最高1A（持续）
- 低静态电流：Iq ≈ 5mA，适合对静耗有一定限制的系统
- 低压差：典型压差1.3V @ 1A
- 高PSRR：70dB @ 10kHz，优秀的纹波抑制能力
- 低噪声：约0.003% Vout（极低输出噪声）
- 保护功能：内部热关断与过流保护（短路保护）
- 封装：TO-252-2L（DPAK），便于表面贴装与散热金属片焊接
三、电气参数与典型性能
- 允许输入电压上限：器件耐压设计可达20V；建议实际应用中输入电压不超过15V以保证热裕量与长期可靠性。
- 压差：1.3V @ 1A，低压差利于在有限输入头寸下获得稳定输出。
- PSRR：70dB @ 10kHz，可有效抑制高频纹波对模拟/射频电路的影响。
- 噪声：0.003% Vout（3.3V时约100µV级别），适合敏感信号链供电。
四、封装与引脚
- 封装形式：TO-252-2L (DPAK)，带大散热片铜盆，适合焊接在PCB散热层上。
- 典型引脚（自封装面向上、引脚朝下）：
1 — GND；2 — VOUT；散热片/板端 — VIN（请以厂方封装图为准）
五、应用与设计注意事项
- 输出电容：为保证稳定性，建议在输出端并联低ESR电容（如10µF~22µF 钽电或陶瓷），并靠近器件放置；输入端同样配备10µF及0.1µF去耦。
- 散热计算：器件功耗Pd = (Vin − Vout) × Iout。举例：Vin=12V、Vout=3.3V、Iout=1A时，Pd≈8.7W，需充分PCB散热或降低输入电压/输出电流以避免过热触发热关断。
- 启动与瞬态：在大负载跃变时注意输出旁路与进、出电容布局以降低瞬态跌落。
- 应用场景：工业控制电源、嵌入式单板3.3V供电、模拟/射频前端、电源管理模块等。
六、可靠性与选型建议
CJU1117B-3.3 以其高PSRR、低噪声与保护功能，适合对模拟性能和可靠性有要求的场合。选型时关注系统最大输入电压与功耗预算，合理配置输出电容和PCB散热层，确保长期稳定工作。若系统输入-输出压差长期较大或散热受限，可考虑开关预稳压或更低压差的LDO以降低总损耗。
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