汽车系统的电源管理IC(PMIC)的出现
这是一个漫长的可能,但最后,低静态电流,高压多输出电源管理IC(PMIC)慢慢地出现用于苛刻的工业和汽车嵌入式发电任务。本文探讨了用于嵌入式设计的电源转换选项,并描述了设计者被迫做出的权衡。
从本次调查的范围日益扩大,高压电源解决方案可从Digi-Key。亮点包括新的单通道的选择,而且一些复杂的多通道部分如TI的四输出五lp8728,其输出tps65310,和最新的电池直接连接解决方案从LTC(lt3514),和OnSemi(ncv890200)。
汽车PMIC的挑战
汽车系统设计受到越来越多的挑战,原因有:工作温度范围宽,严格的EMC控制和瞬态需求,受限空间,以及汽车制造商(OEM)所期望的高交付质量水平。随着嵌入式处理器及其支持组件(例如DDR内存)的日益复杂,对电源轨道的需求也越来越大,这使得电源设计变得更加头疼。
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.
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