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[原创] Maxim MAX20049双路降压转换器和双路LDO稳压器解决方案

关键词:电源管理 DC/DC转换器 LDO稳压器 汽车电子 MAX20049

时间:2019-05-21 11:07:37       来源:中电网

Maxim公司的MAX20049是双路降压转换器和双路低压降(LDO)稳压器.双路降压转换器固定频率PWM工作,输入电压从5V到17V,而MAX20049C输入电压则从4V到17V.器件多所有的四个输出轨提供电压监测.当过压或欠压检测到,电源良好状态进入高阻抗.输出电压出厂时根据各种传感器图像需要设定为3.3V, 3.0V, 2.9V, 2.8V或 2.7V;串行化器存储器的电源则为1.8V,1.2V,1.1V和小于1.0V.电压保护特性包括逐个周期的电流限制,带自动恢复的热关断,降压转换器工作在180°相差.它是业界ADAS应用中最小的PMIC.汽车AEC-Q100规范,主要用在照相机模块如环绕,后端和前端,以及点负载.本文介绍了MAX20049主要特性和优势,典型应用电路,以及评估板MAX20049 EVK主要特性和应用方案与电路图.

The MAX20049 is a dual step-down converter IC with two low-dropout regulators (LDOs), providing a single-chip solution for automotive cameras. The two step-down con­verters are designed for fixed-frequency PWM operation with input voltages from 5V to 17V for MAX20049 and 4V to 17V for MAX20049C. The dedicated high-voltage inputs allow for a flexible solution.

The IC provides voltage monitoring on all four output rails. Once an overvoltage or undervoltage is detected, power good goes high impedance. To accommodate long and inexpensive coax cables, the device has a 500mV SUP1 hysteresis. Both bucks offer very low on-time and allow operation from 17V input to 0.9V output. High-frequency operation allows for an all-ceramic capacitor design and small-size external components. The low-resistance o..

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