WMSIC Electronic Components

RICHTEK RT9742UNGJ5

ModelRT9742UNGJ5
PackageTSOT-23-5
BrandRICHTEK
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 25+

Available for RFQ

Technical data

Product details

20 specifications

Core information

Product name
RICHTEK RT9742UNGJ5
Type
RICHTEK
Unit
Electronic Component
Minimum package
3000

Technical parameters

Electronic Component
Electronic Component
Electronic Component
RICHTEK
Electronic Component
RT9742UNGJ5
Electronic Component
1
Package
TSOT-23-5
Type
Switch
Electronic Component
Power Electronic Switch
Electronic Component
0.039g
Electronic Component
1
Channel Count
1
Features
Integrated Charge Pump; Voltage; Current; Output
Electronic Component
BM0264871448
Resistor
70mΩ
Operating Temperature
40℃~+85℃
Operating Voltage
2.7V~6V
Current
1.5A

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

RT9742UNGJ5 产品概述

一、产品简介

RT9742UNGJ5 是台湾立锜(RICHTEK)推出的一款单通道高侧功率开关,采用小型 TSOT-23-5 封装,面向便携与嵌入式电源管理应用。器件输入为高电平有效,工作电压范围宽(2.7V 至 6V),可提供高达 1.5A 的连续载流能力,典型导通电阻仅 70mΩ,结合集成的保护与控制功能,可简化系统设计并提升可靠性。

二、主要特性

  • 类型:高侧开关,单通道,输入高电平有效。
  • 工作电压:2.7V ~ 6V,适用于 3.3V/5V 等常见电源域。
  • 最大连续电流:1.5A。
  • 导通电阻(RDS(on)):70mΩ(典型)。
  • 集成功能:过温保护、过流/短路保护、欠压锁定(UVLO)、软启动、输出放电、反向电压保护与反向电流阻断、集成电荷泵(提升栅极驱动)。
  • 工作温度范围:-40℃ ~ +85℃。
  • 封装:TSOT-23-5,便于高密度 PCB 布局。

三、功能亮点与工作机制

集成电荷泵可在较低供电电压下为高侧开关提供更优的栅极驱动,帮助器件在 2.7V ~ 6V 范围内维持较低的导通电阻,从而降低功耗与发热。软启动功能限制开启瞬间的浪涌电流,配合输出放电功能可以在关闭时快速拉低输出,避免残余电压影响后续电路。内建的过流/短路与过温保护在异常工况下自动限制或关断输出,提高系统安全性;欠压锁定确保在电源不稳定时避免误导通。反向电压与反向电流阻断使其适合可能存在反向输电或热插拔场景的设计。

四、典型应用场景

  • 电池供电的便携设备电源开关(手机配件、手持终端)
  • USB/外设电源管理与负载断开(USB 开关、从机供电选择)
  • 板级电源分配与保护(电源域隔离、负载控制)
  • LED 驱动或小功率电机的高侧开关控制
  • 热插拔与安全关断电路

五、设计建议与注意事项

  • 布局:VCC 与 OUT 之间靠近放置去耦电容,GND 采用短回路路径与充足铜箔散热。TSOT-23-5 封装热量主要通过引脚和 PCB 散失,1.5A 持续工作时仍需做好铜面散热与过流/热关断余量计算。
  • 去耦:建议在器件 VCC 端靠近焊盘并行联放置陶瓷电容以抑制瞬态电压尖峰。
  • 控制信号:IN 为高电平有效,若控制口悬空应通过上/下拉电阻定义默认状态以避免意外导通。
  • 过流与热限:尽管器件具备保护机制,仍应考虑负载类型(高感性或大电容性负载)可能产生的峰值电流与热应力,必要时在外部增加限流或柔性启动电路。
  • 参考资料:详细引脚定义、软启动时间、保护阈值与典型应用电路请参见官方数据手册以便完成精确设计。

六、总结

RT9742UNGJ5 以小封装、低导通电阻与丰富的保护功能,为中小功率高侧负载开关提供了可靠且易于集成的解决方案。其 2.7V–6V 的宽工作电压与 1.5A 的输出能力非常适合便携设备、电源分配与热插拔场合,适配对体积、可靠性与功能有较高要求的现代电子设计。

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