NXP PCA9450i.MX 8M应用处理器电源管理方案

NXP公司的PCA9450是 i.MX 8M应用处理器电源管理IC(PMIC),通过系统UBOOT配置支持各种存储器(DDR4/LPDDR4/DDR3L等)而不需要改变硬件.器件提供六个高效降压稳压器,5个LDO,一个400mA负载开关,2路电平转移器和32.768 kHz晶振驱动器.三个降压稳压器支持动态电压扫描(DVS)和可编上升和下降时间,支持遥控检测,以补偿降压稳压器对负载的IR降低.器件工作温度为-40 C 到 105 C.PCA9450AA具有三个3A降压稳压器, PCA9450B具有两个3A降压稳压器,而PCA9450C具有6A双相降压稳压器和3A降压稳压器. ESD保护特性,人体模式(HBM)为+/-2000V,充电模式(CDM)为+/-500V.主要用在IoT设备,平板电脑,电子销售终端(ePOS)和工业应用.本文介绍了PCA9450主要特性,框图和功能框图, PCA9450AA和PCA9450B以及PCA9450C用电路图,以及评估板PCA9450AA-EVK, PCA9450B-EVK和PCA9450C-EVK主要特性,电路图,材料清单和PCB元件布局图.

PCA9450 is a single chip Power Management IC (PMIC) specifically designed to

support i.MX 8M family processor in both 1 cell Li-Ion and Li-polymer battery portable

application and 5 V adapter non-portable applications. It supports various memory types

(DDR4/LPDDR4/DDR3L, etc.)via system UBOOT configuration, which does not require

hardware change.

The device provides six high efficiency step-down regulators, five LDOs, one 400 mA

load switch, 2-channel level translator and 32.768 kHz crystal oscillator driver.

Three buck regulators support Dynamic Voltage Scaling (DVS) feature along with

programmable ramping up and down time and those buck regulators support remote

sense to compensate IR drop to load from buck regulator. This device is characterized

across -40 C to 105 C ambient temperature range.

Six step-down regulators are designed to provide power for i.MX 8M application

processor and DRAM memory. Two LDOs, LDO1 and LDO2, feature very low quiescent

current to provide power for Secure Non-Volatile Storage (SNVS) since these LDOs are

always ON when input voltage is valid.

PCA9450 integrates logic transla...