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GATEMODE HM8942T
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- GATEMODE HM8942T
- Type
- GATEMODE
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- GATEMODE
- Electronic Component
- HM8942T
- Electronic Component
- 1
- Package
- SOT-23-6
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.046g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0264388137
- Operating Temperature
- 40℃~+85℃
- Operating Voltage
- 4.75V~40V
- Switching Frequency
- 400kHz~600kHz
- Electronic Component
- Electronic Component
- Output Voltage
- 800mV~24V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
HM8942T 产品概述
一、产品简介
HM8942T 是 GATEMODE（捷茂微）推出的一款同步降压 DC-DC 芯片，适用于 4.75V~40V 宽输入电压、单通道输出的降压应用。芯片集成功率开关，500kHz（典型）工作频率，输出电流可达 1.5A，输出可调（参考电压 VREF=0.6V），并在 SOT-23-6 小封装中实现高集成度与多重保护功能。工作温度范围 -40℃ 至 +85℃，工作在恒频 PWM（FPWM）模式。
二、主要特性
- 输入电压：4.75V ~ 40V；输出电压范围：约 0.8V ~ 24V（VREF=0.6V，可按数据手册规范设计）
- 输出电流：最高 1.5A（内置功率管）
- 开关频率：400kHz ~ 600kHz，典型 500kHz
- 同步整流，提高转换效率
- 低静态电流：Iq ≈ 3mA（静态）
- 保护功能：逐波限流、过流保护、打嗝限流（hiccup）、过压、热关断、内部软启动
- 封装：SOT-23-6；工作模式：FPWM
三、典型应用与元件选型
- 应用场景：车载与工业电源、点烟器供电模块、电池供电系统、9V/12V/24V 转换模块、嵌入式设备稳压。
- 电感：建议 2.2µH ~ 10µH、饱和电流 > (Iout + ΔI/2) 的功率电感。
- 输入电容：耐压 ≥50V 的低 ESR 电容（陶瓷 + 钽/电解做后备）。
- 输出电容：低 ESR 陶瓷电容，考虑纹波与稳定性。
- 反馈分压：Vout = VREF × (1 + Rtop/Rbot)。建议 Rbot 选择 10kΩ 起，举例：Vout=5V，Rbot=10kΩ，则 Rtop ≈ 73.3kΩ。
四、保护与可靠性
芯片支持逐波限流与打嗝限流，发生短路或严重过流时进入限流或周期性复位，避免持续过热。内部软启动降低启动浪涌电流；内置热关断保护在高温下自动关闭输出以防损坏。
五、热管理与 PCB 布局建议
SOT-23-6 封装对散热有限，建议：
- 在散热关键区域（输入、开关节点、功率地）采用大铜箔、加回流或多层接地平面；
- SW 节点走线短而粗，输入电容靠近 VIN 和 GND 引脚布置，输出电容靠近器件；
- 关注功率损耗与温升，在高功率条件下增大铜面积或改用更大封装。
六、器件引脚与选型注意
SOT-23-6 引脚通常包括 VIN、SW、GND、EN、FB 与 COMP/模式引脚。具体引脚定义与功能电平请参考官方数据手册，设计时严格按推荐外部元件和布局要求进行，以保证稳态与动态性能。
HM8942T 以其宽输入、内置开关、丰富保护与恒频 PWM 特性，适合对体积、成本与功能有综合要求的中小功率降压场景。
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