【产品】过流响应仅2μs可编程限流保护芯片,内阻低至90mΩ
SGMICRO推出了内部电阻低至90mΩ的可编程限流保护芯片:SGM2551A。该IC可提供高达1.5A的额定输出电流,工作电压范围为2.5V~5.5V,并且可通过编程控制外部电阻实现限流值在100mA到1.7A范围内的动态调整,十分适用于需要精密电流限制或遇到重的电容负载和短路的应用,如电源独立分配、USB设备防倒灌、过流保护 和VOIP电话。
SGM2551A拥有低至2μs的快速过流响应。同时该IC还支持方向输入-输出电压保护和软启动功能,保证了该产品的稳定性和安全性。当输出负载超过电流限制门限值时,SGM2551A通过使用恒流模式将输出电流限制在安全水平。当输出电压高于输入电压时,内部反向电压比较器将禁用电源开关以保护开关输入端的器件。通过对电源开关的上升和下降次数进行控制,可以最大限度地减少打开/关闭开关时的浪涌电流。
限流保护芯片SGM2551A采用无铅TDFN-2×2-6L和SOT-23-5小封装,适合空间受限的应用。其工作温度范围为-40℃~+ 85℃,因此该IC能适应极端天气。图1为SGM2551A的管脚示意图。
图1:SGM2551A对应两种封装的管脚示意图
SGM2551A的主要特点:
• 高至1.5A的最大负载电流
• 符合USB限流要求
• 可调限制电流值:100mA至1.7A
• 快速过流响应:2μs
• 90mΩ高侧金属氧化物半导体场效应晶体管(MOSFET)
• 高侧MOSFET无反向泄漏电流
• 反向输入-输出电压保护
• 工作电压范围 :2.5V至5.5V
• 内置软启动功能
• 快速自动放电禁用状态(SGM2551C)
• 采用绿色TDFN-2×2-6L和SOT-23-5小封装
SGM2551A的典型应用:
• USB端口/集线器
• 数字电视
• 机顶盒
• 网络语音(VOIP)电话
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型号- 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产品型号
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品类
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Vcc (Min)(V)
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24
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170
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2000
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