开关控制器 Low-Vtg Sync Buck Cntlr
The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package. The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage. The LM1770 is optimized for a low voltage input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.
Three versions of the LM1770 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100kHz to 1000kHz.
电源电压DC 5.50V max
输出接口数 1
输出电压 0.8V ~ 4.5V
输出电流 4 A
通道数 1
静态电流 400 µA
调节输出数 1
开关频率 100kHz ~ 1MHz
拓扑结构 Buck
占空比 95 %
输入电压Max 5.5 V
输入电压Min 2.8 V
最大占空比 95 %
工作温度Max 125 ℃
工作温度Min -40 ℃
电源电压 2.8V ~ 5.5V
输入电压 2.8V ~ 5.5V
安装方式 Surface Mount
引脚数 5
封装 SOT-23-5
封装 SOT-23-5
工作温度 -40℃ ~ 125℃
产品生命周期 Active
包装方式 Tape & Reel TR
RoHS标准 RoHS Compliant
含铅标准 Lead Free
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
LM1770UMF/NOPB TI 德州仪器 | 当前型号 | 当前型号 |
LM1770UMFX/NOPB 德州仪器 | 类似代替 | LM1770UMF/NOPB和LM1770UMFX/NOPB的区别 |