TI LP8774x-Q1系列低噪音雷达用电源管理(PMIC)解决方案
TI公司的LP8774x-Q1系列器件满足各种汽车和工业雷达应用的AWR和IWR MMIC的电源管理要求.器件具有三个降压DC/DC转换器,一个5V升压转换器和一个1.8V/3.3V LDO. LDO由升压转换器供电,给xWR IO供电.器件由SPI串行接口和使能信号控制. 降压DC/DC转换器支持可编程开关频率4.4MHz,4.4MH或17.6MHz.高开关频率和开关频率范围的低噪音使得电源解决方案具有最低限度或不用无源滤波器. LP8774x-Q1系列支持可编起动和关断延迟与加电次序,它同步于ENABLE信号.加电次序还包括GPO信号控制外接稳压器,负载开关和处理器重置.器件默认的设定可编程在非易失存储器(NVM).器件控制输出转换速率以最小化起动时的输出电压过冲和浪涌电流.器件满足AEC-Q100规范,工作温度 –40°C 到 +125°C .主要用在短距离和中距离雷达,超短程雷达以及长距离雷达.本文介绍了LP8774x-Q1系列产品主要特性和简化电路,以及评估模块LP877451Q1EVM电路图,材料清单和PCB设计图.
The LP8774x-Q1 device is designed to meet the power management requirements of the AWR and IWR MMICs in various automotive and industrial radar applications. The device has three step-down DC/DC converters, a 5 V boost converter and a 1.8 V/3.3 V LDO. The LDO is powered from the boost and intended for xWR IO supply. The device is controlled by an SPI serial interface and by enable signals.
The step-down DC/DC converters support programmable switching frequency of 4.4 MHz, 8.8 MHz, or 17.6 MHz. High switching frequency and low noise across wide frequency range enable LDO-free power solution with minimal or no passive filtering...
