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DFN3*3mm封装!具有使能互锁的120V,3A高频半桥驱动器MD18208

2026年05月28日

一、背景


在AI算力、人工智能技术的爆发式突破与智能机器人应用的普及,配套电源需求量迅速增长,同时对底层电力电子系统提出了新的要求:如何在更小的空间内实现同等甚至更高的功率输出? 这一趋势正驱动电源设计向着超高功率密度、系统极致简化的方向演进,在提升性能、可靠性的同时,显著降低系统尺寸。

为精准应对行业对高功率密度与小型化的迫切需求,茂睿芯推出新一代120V半桥驱动芯片MD18208。该芯片采用紧凑型DFN 3×3mm封装,尺寸较上一代MD18211A最小封装DFN 4×4mm相比缩小达43.75%,显著节省PCB空间。同时,为兼顾不同应用场景对布局紧凑性与散热性能的差异化需求,MD18208还同步推出DFN 4×4mm-8和SOP-8封装版本,为用户提供了灵活多元的选择,全面适配从AI服务器电源到后端二次电源IBC等多样化高性能系统设计需求。

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二、茂睿芯120V半桥驱动MD18208

茂睿芯新一代半桥驱动芯片MD18208延续采用成熟的120V BCD工艺,内部集成高压自举二极管,通过优化电路设计显著提升了抗干扰能力,在确保系统稳定性的基础上,新增使能控制与输入逻辑互锁功能,有效防止误触发和上下管直通风险,大幅增强了驱动系统的安全性和可靠性,满足AI服务器等高要求应用场景对长期稳定运行的严苛标准。

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MD18208 DFN3*3实物图

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MD18208 VS MD18211A 

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MD18208选型表

三、MD18208引脚封装图&典型应用框图

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MD18208引脚封装图

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MD18208三种封装实物图

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MD18208典型应用框图

四、MD18208核心功能

  • 5-17V的VDD工作电压,最大耐压20V

  • -10~20V的Input pin耐压能力,且和VDD电平状态无关

  • 120V 的HB绝对耐压能力

  • -18V的HS耐负压能力(实测能耐-30V&100ns不坏)

  • 11uA的静态工作电流@EN为低时

  • 3A/3A的拉/灌电流能力

  • 2.1V/1.1V的Hi/Li开通关断阈值,迟滞1V

  • 16ns(典型值)传输延时,1ns(典型值)延时匹配

  • 输入逻辑互锁防止上下管直通

  • 支持至少1MHz开关频率

  • 符合ROHS标准

  • 管脚兼容

    (行业标准DFN 3X3-10、DFN 4X4-8、SOP-8封装)

五、MD18208产品优势

在算力需求激增的背景下,供电系统正持续追求更高的功率密度以缩小系统体积。众所周知,在相同功率下,缩小系统体积最直接的方式是在满足耐压与安全间距的前提下,选用尺寸最小的器件,并通过提升开关频率以减小磁性元件的体积,从而实现极致紧凑的设计。然而,在迈向高密度集成的同时,更加紧凑的器件布局,越来越复杂的PCB走线,以及高频、高di/dt和dv/dt效应显著增强,电磁干扰(EMI)与信号完整性问题也随之加剧,给系统稳定性与可靠性带来严峻挑战。

MD18208从传统4×4mm封装升级至3×3mm,驱动器占板面积直接缩小43.75%,在实现小型化突破的同时,集成输入逻辑互锁、高输入信号正负压耐受、高HS端负压容限及优异的HS共模瞬态抗扰能力等核心特性能全面应对高功率密度场景下的严苛可靠性与系统稳定性需求。

1、更优保护 - 软硬件结合防止桥臂直通

在电源半桥类拓扑应用中,高频开关带来的噪声干扰可能导致驱动芯片的高边(HI)与低边(LI)输入引脚同时被误拉高,进而引发高低边输出同时导通,造成桥臂直通,轻则误触发过流保护,重则导致功率器件永久损坏。

MD18208集成硬件级输入逻辑互锁功能:当检测到HI与LI同时为高电平时,芯片自动进入互锁保护模式,强制将高低边输出同时拉低,有效阻断直通路径;仅当任一输入回归低电平后,输出才恢复为正常跟随状态。该机制从硬件层面构建安全屏障,与软件侧死区时间协同配合,实现“软硬结合”的双重防护。真正做到了更优保护——不仅依赖系统级配置,更在驱动器端主动拦截风险,显著提升系统在高噪声、高频率场景下的可靠性与安全性。

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MD18208互锁功能测试波形

2、更稳驱动 - 宽耐压输入守护信号可靠

在电源系统中,MOSFET的高频开关会在GND回路产生快速变化的瞬态电流(di/dt)。由于控制器与驱动器之间的PCB走线一般比较长存在寄生电感,该瞬态电流与其耦合后,易在驱动芯片输入引脚上形成显著的负压尖峰或过冲电压,导致输入逻辑误判、驱动异常甚至芯片损坏。

MD18208 具备优异的输入信号容限能力支持-10V负压和+20V正压的宽范围耐受,有效应对干扰带来的电压偏移。无论在高噪或紧凑布局等严苛条件下,输入信号仍能被准确识别与传递,确保驱动输出稳定可靠。这正是“更稳驱动”的核心所在——不止于输出能力强,更在于对输入信号的充分包容与精准响应。

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MD18208输入引脚IV曲线

3、更大冗余 - 高HS负压能力不止于-18V冲击

随着电源系统对效率和功率密度的追求不断提升,MOSFET开关速度持续加快,以降低开关损耗。然而,高速切换带来的高 di/dt 与PCB寄生电感耦合作用,易在高边开关节点(HS)产生严重的瞬态负压,轻则导致驱动异常,重则引发芯片闩锁(latch-up)或永久损坏。

针对这一挑战,MD18208 在HS引脚耐压设计上实现突破,标称支持 -18V 负压耐受,实测表现更可稳定承受低至 -30V@200ns的瞬态冲击。这一远超常规的设计,为系统提供了充足的电压裕量,真正体现了“更大冗余”的工程理念——不仅满足典型工况,更能从容应对极端瞬态应力。让高频、高效与高可靠不再相互妥协,全面助力AI服务器、数字电源等前沿应用的稳定运行。

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MD18208 HS负压能力测试波形

4、更强抗扰 - 高共模抗扰硬刚高频dV/dt冲击

在高功率密度电源系统中,高边开关节点(HS)在开关瞬间会产生快速电压跳变(dV/dt),若驱动芯片HS端的共模瞬变抗扰能力不足,轻则导致驱动紊乱、系统保护触发,重则引发芯片闩锁(latch-up)或永久损坏,严重影响系统可靠性。

MD18208 具备50 V/ns以上的共模瞬变抗扰能力,通过优化内部信号路径与地参考稳定性,在典型高频应用条件下有效抵御共模噪声冲击,确保高边驱动信号准确稳定,防止误开通风险。以扎实性能构筑“更强抗扰”防线,让系统在复杂电磁环境中依然可靠运行。

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MD18208 HS共模抗扰能力测试波形

六、MD18208应用场景

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  1. CONNECT:[ UseTime:0.000310s ] mysql:host=127.0.0.1;port=3306;dbname=maoruixin_com;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `eb_lang` [ RunTime:0.000509s ]
  3. SELECT * FROM `eb_lang` WHERE `site` LIKE '%//www.meraki-ic.com%' AND `status` = 1 LIMIT 1 [ RunTime:0.000235s ]
  4. SHOW FULL COLUMNS FROM `eb_news_cn` [ RunTime:0.000442s ]
  5. UPDATE `eb_news_cn` SET `hits` = `hits` + 1 WHERE `id` = 1 [ RunTime:0.004301s ]
  6. SELECT * FROM `eb_news_cn` WHERE `catid` = 10 AND `id` = 1 LIMIT 1 [ RunTime:0.000339s ]
  7. SHOW FULL COLUMNS FROM `eb_cms_category` [ RunTime:0.000401s ]
  8. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 24 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000258s ]
  9. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 25 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000265s ]
  10. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 26 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000263s ]
  11. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 27 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000243s ]
  12. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 24 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000262s ]
  13. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 25 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000237s ]
  14. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 26 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000275s ]
  15. SELECT * FROM `eb_cms_category` WHERE ( `status`=1 AND `parentid` = 27 ) AND `lang` = 'cn' ORDER BY `listorder` DESC LIMIT 0,10 [ RunTime:0.000241s ]
  16. SELECT * FROM `eb_news_cn` WHERE ( `catid` = 10 AND `status` = 1 AND `id` < 1 ) ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000249s ]
  17. SELECT * FROM `eb_news_cn` WHERE ( `catid` = 10 AND `status` = 1 AND `id` > 1 ) LIMIT 1 [ RunTime:0.000364s ]
0.044627s