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RT7258为具有内部集成高端功率MOSFET与对低端外部功率MOSFET闸极驱动电路的同步驱动降压型 DC/DC 转换器,在4.5V至24V输入范围内输出电流可高达8A。RT7258的电流模式架构允许操作在宽输入电压与负载范围保有良好的瞬时响应。逐周期形式的限流机制可在输出短路时提供电路保护作用,缓启动机制则可消除启动瞬间的输入电流涌浪的问题。RT7258可藉由外部的频率讯号进行频率范围300Khz至1.5MHz的同步化操作。RT7258采用WDFN-14L 4x3 与 SOP-8 (裸露焊盘)的封装规格。
4.5V 至 24V输入电压范围
8A输出电流
45mΩ内部集成的高端N-MOSFET开关
电流模式控制
600kHz 切换频率
0.808V 至 15V 可调输出电压范围
效率高达 95%
具内部的补偿机制
可采用陶瓷电容达到稳定
外部频率同步操作范围:300kHz 至1.5MHz
逐周期的电流限制机制
输入低电压锁定机制
输出低电压保护
电源良好信号指示
热关断保护
符合RoHS规范与无卤特性
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