TPS65283同步双路降压转换器采用了散热增强的4mm×4mmVQFN封装，是全功能4.5到18VVin、3.5A/2.5A输出电流同步降压直流-直流转换器，具有高效率并集成高侧和低侧MOSFET。此篇主要介绍了TPS65283特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。
TPS65283特性：宽幅输入电压范围4.5到18V；反馈基准电压0.6V±1%；外部时钟同步；逐周期电流限制
TPS65283典型应用范围：USB端口和集线器；机顶盒；数字电视；数字用户线路(DSL)/电缆调制解调器，无线路由器；家庭网关和接入点网络
TPS65283参考设计应用电路：
图1TPS65283内部结构图
The TPS65283, TPS65283-1 responds to overcurrent conditions on power switches by limiting the output currents to I OCP_SW level, which is set by external resistor. When the load current is less than the current-limit threshold, the devices are not limiting current. During normal operation, the N-channel MOSFET is fully enhanced, and VSW_OUT = VSW_IN – (ISW_OUT × Rdson_SW).
图2TPS65283参考设计图
TheTPS65283, TPS65283-1 in thermally-enhanced 4-mm × 4-mm VQFN package is a full featured 4.5- to 18-V Vin, 3.5-A/2.5-A output current synchronous step down DC-DC converter, which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs.
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