WMSIC Electronic Components

GATEMODE HM8642YA

ModelHM8642YA
PackageSOT23-6
BrandGATEMODE
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

19 specifications

Core information

Product name
GATEMODE HM8642YA
Type
GATEMODE
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
GATEMODE
Electronic Component
HM8642YA
Electronic Component
1
Package
SOT23-6
Electronic Component
DC-DC Power Supply IC
Electronic Component
1g
Electronic Component
1
Type
Electronic Component
Synchronous
Electronic Component
Electronic Component
BM0264388135
Operating Temperature
40℃~+125℃
Operating Voltage
4.75V~40V
Switching Frequency
1.2MHz
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.

HM8642YA 产品概述

一、产品简介

HM8642YA 是捷茂微(GATEMODE)推出的一款降压型同步整流 DC-DC 转换器,输入电压范围宽(4.75V~40V),采用内置开关管的降压拓扑,SOT23-6 小封装。芯片集成软启动、热保护、过压及短路保护,工作频率 1.2MHz,轻载自动进入高效 PFM 模式,适合空间受限且需高效率、电磁兼容良好的电源设计。

二、主要规格

  • 功能类型:降压型(同步整流)
  • 输入电压:4.75V~40V
  • 输出电压:可调,VREF = 0.765V,输出范围约 0.8V~24V(通过外部分压器设定)
  • 输出电流:最大 1.5A
  • 开关频率:典型 1.2MHz
  • 工作温度:-40℃~+125℃
  • 封装:SOT23-6

三、功能特性

  • 同步整流,高效率、减少外部肖特基损耗
  • 高开关频率(1.2MHz),有利于减小外部电感与电容体积
  • 轻载高效 PFM 模式,改善轻载下效率与待机功耗
  • 逐波(cycle-by-cycle)限流与打嗝限流(hiccup),兼顾短路保护与过流响应
  • 内置软启动与热关断,提升系统可靠性与启动冲击控制

四、典型应用

  • 汽车电子与工业电源(宽输入、耐高压)
  • 单片机、数字电路和传感器供电
  • 便携设备、电池供电系统的中低功率稳压模块
  • 通信、电源管理模块等空间受限场合

五、引脚与外设选型提示

  • 输出电压通过外部分压设置:VOUT = VREF × (1 + Rtop/Rbottom),VREF = 0.765V。
  • 建议使用低 DCR 的功率电感(根据输出电流及允许纹波选择,常见 1~4.7µH 范围)与低 ESR 陶瓷电容(输出侧多并联 10µF~47µF X5R/X7R),输入侧配置 10µF+0.1µF 陶瓷并联以抑制瞬态。

六、PCB 布局与热管理建议

  • 输入电容靠近 VIN 与 GND 引脚布局,开关回路(VIN、SW、功率电感、输出电容)走线尽量短且宽,减少环路面积;
  • 将敏感的反馈 (FB) 与参考地走向稳压地,避免与功率地混合噪声;
  • SOT23-6 封装热量主要通过焊盘到 PCB 散出,应在底层做充足铜箔或多层过孔散热以保证长期稳定工作。

七、保护与可靠性说明

HM8642YA 集成多重保护机制:软启动限制启动电流冲击,逐波限流与打嗝限流在短路或过载时保证输出恢复能力,热关断防止过温损伤,过压保护提高系统容错性。推荐在系统设计中结合器件热仿真与实际测量验证散热方案。

总结:HM8642YA 以其宽输入、电流能力与高频特性,适合要求体积小、效率高且具备多重保护的降压稳压场景,是多种汽车级与工业级电源设计的理想选择。

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