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 translator which is a 2-bit, dual supply translating transceiver

with auto direction sensing. It enables bidirectional voltage level translation. It can be

used as I2C level translator. 400 mA load switch is to supply 3.3 V power supply to SD

card, which has internal discharge resistor.

PCA9450 has three versions: PCA9450AA is companion PMIC for (i.MX 8M Mini),

PCA9450B is companion PMIC for i.MX 8M Nano and PCA9450C is companion PMIC

for i.MX 8M Plus.

The PCA9450 is offered in 56-pin HVQFN package, 7 mm x 7 mm, 0.4 mm pitch.

PCA9450主要特性.

•Six high-efficiency step-down regulators

–Three 3 A buck regulators with DVS feature and remote sense

– PCA9450AA – Three 3 A buck regulators

– PCA9450B – Two 3 A buck regulators

– PCA9450C – 6 A dual-phase buck regulator and 3 A buck regulator

•One 3 A buck regulator

•Two 2 A buck regulators

•Five linear regulators

–Two 10 mA LDOs

–One 150 mA LDO

–One 200 mA LDO

–One 300 mA LDO

•Support various memory types: DDR4/LPDDR4/DDR3L via system UBOOTconfiguration, no hardware change required

•400 mA load switch with built-in active discharge resistor

•32.768 kHz crystal oscillator driver and buffer output

•Two channel logic level translator

•Power control IO

–Power ON/OFF control

–Standby/run mode control

•Fm+ 1 MHz I2C-bus interface

•ESD protection

–Human Body Model (HBM) : +/- 2000 V

–Charged Device Model (CDM) : +/-500 V

•7 mm x 7 mm, 56-pin HVQFN with 0.4 mm pitch

PCA9450应用:

•IoT Devices

•Tablet

•Electronic Point of Sale (ePOS)

•Industrial application

图1.PCA9450框图

图2.PCA9450功能框图

PCA9450特性:

The PCA9450 is a power management integrated circuit (PMIC) designed to be the

primary power management for NXP application processors, i.MX 8M Mini, Nano and

Plus.

•Buck regulators

–BUCK1, BUCK2, BUCK3 : 0.6 V to 2.1875 V, 12.5 mV step, 3000 mA

–BUCK4 : 0.6 V to 3.4 V, 25 mV step, 3000 mA

–BUCK5, BUCK6 : 0.6 V to 3.4 V, 25 mV step, 2000 mA

–Dynamic Voltage scaling on BUCK1, BUCK2 and BUCK3

–Support remote sensing on BUCK1, BUCK2 and BUCK3

–BUCK1-BUCK3 configurable as a 6 A dual phase regulator (PCA9450C)

–Monitor fault condition

•LDO regulators

–LDO1, 1.6 V to 1.9 V, 3.0 V to 3.3 V 100 mV step, 10 mA

–LDO2, 0.8 V to 1.15 V with 50 mV step,10 mA

–LDO3, 0.8 V to 3.3 V with 100 mV step, 300 mA

–LDO4, 0.8 V to 3.3 V with 100 mV step, 200 mA

–LDO5, 0.8 V to 3.3 V with 100 mV step, 150 mA, Voltage selection through SD_VSEL

pin

–Monitor fault condition

•Support various memory types: DDR4/LPDDR4/DDR3L via system UBOOT

configuration, no hardware change required

•400 mA Load switch for SD card

–Built-in OCP protection

–GPIO/I2C control

–Built-in Active discharge resistor

•Two Channel logic level translator

•32.768 kHz Crystal Oscillator driver

–Mux output with internal 32 kHz output

•Protection and Monitoring: Soft start, Power Rails Fault detection, UVLO, Thermal

Shutdown

•Configurable reset behavior from WDOGB, PMIC_RST_B and SW_RST Register

•Power control IO

–PMIC_ON_REQ, PMIC_STBY_REQ

•Fm+ 1 MHz I2C-bus interface

•Type3 PCB applicable

图3.PCA9450降压1/3配置图

图4.PCA9450AA应用电路图

图5.PCA9450B应用电路图

图6.PCA9450C应用电路图

评估板PCA9450AA-EVK,PCA9450B-EVK和PCA9450C-EVK

There are three evaluation boards for the PCA9450 family device: PCA9450AA-EVK,

PCA9450B-EVK and PCA9450C-EVK. When evaluating the device, the kits below are

required:

•1x PCA9450 evaluation board, which allows easy evaluation on function and features

•1x Interface (FTDI C232HM-EDHSL-0) cable, serves as a USB to I2C-bus interface

between the computer and the PCA9450 evaluation board

•A Windows based Graphic User Interface (GUI) provides a user friendly interface to

program on-chip I2C registers to exercise the feature on PCA9450

图7. 评估板PCA9450连接图

图8.评估板PCA9450AA-EVK电路图

图9.评估板PCA9450B-EVK电路图

图10.评估板PCA9450C-EVK电路图

评估板PCA9450材料清单:

图11.评估板PCA9450 PCB元件布局图

详情请见:

http://www.tiexinbb.com/mcu_ws/solution/https://www.nxp.com.cn/docs/en/data-sheet/PCA9450DS.pdf

和

http://www.tiexinbb.com/mcu_ws/solution/https://www.nxp.com.cn/docs/en/user-guide/UM11556.pdf

PCA9450DS.pdf

UM11556.pdf