汽車系統(tǒng)的電源管理IC（PMIC）的出現(xiàn)

　　這是一個(gè)漫長(zhǎng)的可能，但最后，低靜態(tài)電流，高壓多輸出電源管理IC（PMIC）慢慢地出現(xiàn)用于苛刻的工業(yè)和汽車嵌入式發(fā)電任務(wù)。本文探討了用于嵌入式設(shè)計(jì)的電源轉(zhuǎn)換選項(xiàng)，并描述了設(shè)計(jì)者被迫做出的權(quán)衡。

　　從本次調(diào)查的范圍日益擴(kuò)大，高壓電源解決方案可從Digi-Key。亮點(diǎn)包括新的單通道的選擇，而且一些復(fù)雜的多通道部分如TI的四輸出五lp8728，其輸出tps65310，和最新的電池直接連接解決方案從LTC（lt3514），和OnSemi（ncv890200）。

　　汽車PMIC的挑戰(zhàn)

　　汽車系統(tǒng)設(shè)計(jì)受到越來越多的挑戰(zhàn)，原因有：工作溫度范圍寬，嚴(yán)格的EMC控制和瞬態(tài)需求，受限空間，以及汽車制造商（OEM）所期望的高交付質(zhì)量水平。隨著嵌入式處理器及其支持組件（例如DDR內(nèi)存）的日益復(fù)雜，對(duì)電源軌道的需求也越來越大，這使得電源設(shè)計(jì)變得更加頭疼。

　　Long gone are the days when 5 V and 3 V rails would suffice. Consider the latest ‘infotainment’ processors. Automotive companies， recognizing the cost effectiveness of embedded processors developed for tablet and smartphone applications， have been deploying the same base MCU architectures to deliver feature-rich infotainment experiences. However， MCUs such as Freescale‘s i.MX 6 series highlight how complex the powering problem is （e.g. consider the MMPF0100）。 An i.MX 6 system can require twelve regulated power rails， some supplying more than 2 A; others may be tight tolerance and at low levels （e.g. 0.8 V）。 Building such a supply system discretely would be impossible， especially as these processors need precise power rail sequencing. It is not just the complex mix of supply rails， current demanded， tolerance， and sequencing that matter. Overriding all of these considerations is thermal management.