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RT7258為具有內部集成高端功率MOSFET與對低端外部功率MOSFET閘極驅動電路的同步驅動降壓型 DC/DC 轉換器,在4.5V至24V輸入範圍內輸出電流可高達8A。RT7258的電流模式架構允許操作在寬輸入電壓與負載範圍保有良好的暫態回應。逐週期形式的限流機制可在輸出短路時提供電路保護作用,緩啟動機制則可消除啟動瞬間的輸入電流湧浪的問題。RT7258可藉由外部的頻率訊號進行頻率範圍300Khz至1.5MHz的同步化操作。RT7258採用WDFN-14L 4x3 與 SOP-8 (裸露焊盤)的封裝規格。
4.5V 至 24V輸入電壓範圍
8A輸出電流
45mΩ內部整合的高端N-MOSFET開關
電流模式控制
600kHz 切換頻率
0.808V 至 15V 可調輸出電壓範圍
效率高達 95%
具內部的補償機制
可採用陶瓷電容達到穩定
外部頻率同步操作範圍:300kHz 至1.5MHz
逐週期的電流限制機制
輸入低電壓鎖定機制
輸出低電壓保護
電源良好信號指示
熱關斷保護
符合RoHS規範與無鹵特性
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