TI LP87745-Q1 AWR和IWR雷达传感器降压转换器解决方案

TI公司的LP8774x-Q1是满足各种汽车和工业雷达应用的AWR和IWR MMIC功率管理要求的器件.器件具有三个降压DC/DC转换器,一个5V升压转换器和1.8V/3.3V LDO. LDO由升压转换器供电,打算给xWR IO供电.器件由SPI串行接口和使能信号控制.降压DC/DC转换器支持可编开关频率4.4MHz,8.8MHz或17.6MHz.高开关频率和宽频率范围的低噪音使得无LDO功率解决方案,具有极少的或没有无源滤波器.器件满足AEC-Q100 规范:环境工作温度–40°C 到 +125°C,增加ISO 26262安全系统到ASIL-C/SIL-2,输入电源过压和欠压监视,稳压器输出过压和欠压监视,对外接电源轨进行过压和欠压监视.主要用在短距离和中距离雷达,超短距离雷达和长距离雷达.本文介绍了LP8774x-Q1主要特性, 简化电路图以及评估模块LP877451Q1EVM主要特性,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/3.3V 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.

This improves thermals and transient settling for the MMIC RF rails. The switching clock is forced to PWM mode for optimal RF performance and can also be synchronized to an external clock. The LP8774x-Q1 device supports remote voltage sensing to compensate IR drop between the regulator output and the point-of-load (POL) which improves the accuracy of the output voltage.

The LP8774x-Q1 device supports programmable start-up and shutdown delays and sequences which are synchronized to the ENABLE signal. The sequences can also include GPO signals to control external regulators, load switches, and processor reset. The default settings for the ...