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ST LDK320ADU33R
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- ST(STMicroelectronics) LDK320ADU33R
- Type
- ST
- Unit
- Electronic Component
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- 350mV@(200mA)
- Electronic Component
- ST(STMicroelectronics)
- Electronic Component
- 63uVrms
- Electronic Component
- LDK320ADU33R
- Electronic Component
- 1
- Package
- SOT-89-3
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.18g
- Electronic Component
- 1
- Electronic Component
- BM0058412216
- Operating Temperature
- 40℃~+125℃@(Tj)
- Operating Voltage
- 18V
- Output
- Electronic Component
- Output Voltage
- 3.3V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LDK320ADU33R 产品概述
一、简介
LDK320ADU33R 是意法半导体（ST）推出的一款固定输出线性稳压器（LDO），输出电压为3.3V，面向对低噪声、高抑制性能和保护功能有需求的小功率系统。器件为单通道正输出，封装为SOT-89-3，适合空间受限的板级电源方案。
二、主要特点
- 固定输出：3.3V 正极输出。
- 工作电压：最高可达 18V（输入端）。
- 输出电流：最大 200mA。
- 低静态电流：Iq ≈ 100μA，适合对待机功耗敏感的应用。
- 低噪声：63 μVrms，提高模拟/射频前端性能。
- 优异PSRR：88 dB @ 120 Hz，有效抑制电源纹波。
- 保护功能：内置过流保护、短路保护和过热（热关断）保护。
- 带使能（EN）功能：外部控制允许快速上/下电及节能管理。
- 封装：SOT-89-3，便于小型化PCB布置。
三、电气性能要点
- 压差（Dropout）：350 mV @ 200 mA，确保在高电流工作点仍有较小压差损失。
- 噪声与抑制：噪声 63 μVrms 与 PSRR 88 dB（120 Hz）使其在对噪声敏感的模拟、传感器或射频前端场合表现良好。
- 保护机制确保在负载异常或热应力情况下器件自我保护，提升系统可靠性。
四、热设计与封装注意
线性稳压器的最大功耗由输入输出电压差与负载电流决定：Pd = (Vin − Vout) × Iout。
示例：若 Vin = 18 V、Vout = 3.3 V、Iout = 200 mA，则 Pd ≈ (18 − 3.3) × 0.2 ≈ 2.94 W。
在 SOT-89-3 小封装下，这样的功耗会导致显著的结温上升，必须重视热管理：
- 通过加大PCB的散热铜箔（尤其是靠近GND平面）降低热阻；
- 限制输入电压或负载电流，必要时增加外部散热或选择更大封装。
器件工作结温范围为 −40 ℃ 至 +125 ℃（Tj），设计时应保证结温不超过额定值。
五、典型应用
- 便携式设备与电池供电系统（需注意功耗与热管理）
- 工业控制与传感器供电，尤其需低噪声、良好PSRR的场合
- 通信/网络外围电源、单板电源子模块
- IoT 节点、嵌入式系统电源管理
六、使用建议
- 输出端建议使用稳定的低ESR输出电容以保证环路稳定性（参照厂商数据手册选择容值与ESR范围）。
- 在高Vin或大电流条件下必须评估热耗散并优化PCB散热。
- 使能端用于系统电源序列或省电模式控制，注意输入逻辑电平规格。
- 应用前请查阅完整数据手册以获得精确的引脚定义、典型特性曲线和外部元件建议。
总结：LDK320ADU33R 以其低噪声、优秀的PSRR、完备的保护功能和带使能设计，适合对电源质量和可靠性有较高要求的中低功率应用，但在高输入电压和高负载电流场合应特别注意热设计与功耗限制。
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