設計多軌電源時，每增加一個電源軌，挑戰都會成倍增加。設計師必須考慮怎樣動態協調電源排序和定時、加電復位、故障監視、提供恰當的響應以保護系統等方方面面。有經驗的設計師都知道，隨著項目從原型向生產環境轉變，成功應對這種動態變化環境的關鍵是靈活性。

　　Introduction

　　Designingamultiplepower supplysystemis challenging. The power supply designer’sworkloadmultiplies with each additional supply rail. The designer must consider the dynamic environment of coordinated power supply sequencing and timing， generating power-on reset， monitoring forfaults and responding appropriately to protect the system. An experienced designer recognizes that flexibility is key to successfully navigating the ebb and flow as a project moves from prototype to production. The ideal solution minimizes the number of hardware and software changes during development.

　　The ideal multisupply design tool is a single IC that resides in a design from beginning to end， requiring no wiring changes through the life cycle of the product. It autonomously supervises and sequences multiple power rails， cooperating with other ICs to seamlessly supervise many power regulators in the system， and provides fault and reset management. The designer can use powerful PC-based software to configure， visualize and debug system behavior in real time when connected to an I 2C bus