WMSIC Electronic Components

LOWPOWER LP3987H-33B5F

ModelLP3987H-33B5F
PackageSOT-23-5
BrandLOWPOWER
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 26+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
LOWPOWER LP3987H-33B5F
Type
LOWPOWER
Minimum package
3000 个

Technical parameters

Electronic Component
Electronic Component
Electronic Component
480mV@(600mA)
Electronic Component
LOWPOWER
Electronic Component
100uVrms
Electronic Component
LP3987H-33B5F
Electronic Component
1
Package
SOT-23-5
Electronic Component
Linear Regulator(LDO)
Electronic Component
0.046g
Electronic Component
1
Features
Output
Electronic Component
BM0229970642
Operating Temperature
40℃~+125℃@(Tj)
Operating Voltage
6V
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.

LP3987H-33B5F 产品概述

一、主要性能概述

LP3987H-33B5F 是微源半导体(LOWPOWER)推出的一款低压差、低噪声、固定输出3.3V线性稳压器。该器件为单通道、正极输出,SOT-23-5 封装,适合对噪声与电源抑制有较高要求的小型便携与嵌入式系统。主要电气参数概览:

  • 输出电压:固定 3.3V
  • 最大输出电流:600mA
  • 压差(Dropout):480mV @ 600mA
  • 静态电流(Iq):130µA
  • 电源纹波抑制比(PSRR):65dB @ 1kHz
  • 输出噪声:100µVrms
  • 工作结温范围:-40℃ ~ +125℃(Tj)

二、关键特性

  • 带使能(EN)引脚,可用于电源使能与顺序控制,支持低功耗待机。
  • 过热保护(Thermal Shutdown)与过流保护(Current Limit),在短路或过载条件下自动限制并保护器件与系统。
  • 低静态电流与较高PSRR,适合电池供电及对射频/模拟模块干扰敏感的场合。
  • SOT-23-5 小外形,利于空间受限的移动与便携设备设计。

三、封装与典型引脚功能(示意)

SOT-23-5(封装示意):常见引脚功能包括 VIN、VOUT、GND、EN(使能)、NC/备用。具体引脚排列与管脚定义请以厂方数据手册为准。

四、设计与布局注意事项

  • 输入与输出侧均建议使用低ESR陶瓷去耦电容,典型配置为 VIN 端 1µF 陶瓷,VOUT 端 2.2µF~10µF 陶瓷,电容尽量靠近相应引脚放置以降低寄生感抗与纹波。
  • 考虑功耗与温升:器件功耗 Pd ≈ (Vin - 3.3V) × Iout。高差压或大电流下需通过加大PCB铜箔面积或散热结构降低结温,避免触发热保护导致降额。
  • 布线要短且粗,GND 建议做完整地平面并在输入/输出附近安放去耦,减少环路面积以优化噪声与PSRR表现。
  • 使能控制:EN 为高电平使能,需避免在不稳定电源上频繁切换;必要时在 EN 上加上滤波或上拉/下拉设置以保证上电顺序可靠。

五、典型应用场景

  • 电池供电的便携设备与传感节点(因低Iq 与小体积适合延长待机时间并节约空间)
  • MCU、电源管理与外设供电(3.3V 数字与模拟电路)
  • 无线与射频前端、ADC/DAC 等对电源噪声敏感的模拟应用(PSRR 与低输出噪声有利提高系统性能)
  • 工业与仪表领域要求宽温度工作与可靠保护功能的场合

六、选型与使用建议

在选型时关注实际系统的输入电压范围与最大功率耗散能力,确保在最大负载下器件结温不超过 125℃。在高电流或高差压应用中,考虑外部散热或选用更大功率器件。有关详细引脚定义、典型应用电路及完整电气特性,请参考 LOWPOWER 官方数据手册以获得精准参数与参考电路。

总结:LP3987H-33B5F 以其低压差、低噪声、低静态电流与完整保护特性,适合对空间、功耗与电源质量有严格要求的 3.3V 电源设计。

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