一种单向负阻TVS产品设计  

Design of a One-way Negative Resistance TVS Product

作　　者：苏海伟 SU Haiwei(Shanghai Changyuan Weian Microelectronics Co.,Ltd,Shanghai 201202,China)

机构地区：[1]上海长园维安微电子有限公司,上海201202

出　　处：《集成电路应用》2019年第6期1-3,共3页Application of IC

基　　金：上海市科技型企业技术创新课题项目

摘　　要：手机等消费电子充电电路由于充电电流、电压越来越高以及安全性和可靠性的要求,需要使用低钳位电压的浪涌防护TVS产品来满足VBUS端口保护需求。配合OVP组成保护充电IC芯片的方案中,要求TVS产品正向浪涌钳位电压和负向浪涌钳位电压均小于OVP瞬态耐压极限。分析单向TVS的优缺点和双向TVS保护器件封装小型化过程中出现的问题,最终通过改进背面电极,提出了带负阻特性的单向TVS器件,该结构在具有双向TVS二极管低钳位电压和低击穿电压优点的同时,又具有单向TVS二极管负向浪涌钳位电压低的优点。As the charge current and voltage is getting larger,and the requirement of safety and reliability is getting higher,the charge circuit of consumer electronics like cell phone would require low clamping voltage TVS to protect the VBUS interfaces.In the charge IC protection solution,the TVS forward and negative surge clamping voltage has to be smaller than the OVP transient voltage tolerance limit.This paper analyzes the advantages and disadvantages of unidirectional TVS,and the problems in the process of packaging miniaturization of bi-directional TVS protection devices.Finally,by improving the back electrode,proposes the unidirectional TVS device with shallow snap-back characteristics.The structure has the advantage of low clamping voltage and low breakdown voltage as bidirectional TVS,and has the forward low clamping voltage as the unidirectional TVS.

关 键 词：瞬态抑制二极管 TVS 钳位电压 负阻 

分 类 号：TN313[电子电信—物理电子学]