ST L5963集成LDO和HSD的双路开关稳压器解决方案

ST公司的L5963是双路单片开关稳压器,包括两个开关模式同步降压转换器,线性稳压电源(LDO)和高边驱动器(HSD)和电压检测器.为了保证鲁棒工作,所有的输出都有单独的热保护和电流限制.满足AEC-Q100,输入电压从3.5V到26V,集成了高边/低边NDMOS,输出大于1V,负载电流3.0A,主要用在汽车电子.本文介绍了L5963主要特性,功能框图和应用电路,以及评估板EVAL-L5963和EVAL-L5963Q主要特性,电路图和PCB设计图.
The L5963 integrates two switching mode synchronous step down converters, a linearly regulated power supply, a protected high side driver and voltage detectors. To guarantee a robust operation, all the outputs have independent thermal protection and current limitation.
The two switching mode synchronous step-down converters employ voltage mode control and feed forward functions to provide good load regulation and line regulation. Each converter has its own enable. The users can adjust the output voltage of the two converters by an external resistor divider. If the converters need to work with a frequency different from the free running frequency, in order to consider EMC performance in system level, they can be synchronized to an external clock by applying it on the SYNCIN pin. The frequency should be higher than half of the free running frequency. If there are more than one L5963 in the system they can work in Master-Slave configuration, to make sure all L5963 have the same operating frequency of the Master device. This Master-Slave function is implemented by a dedicated pin SYNCOUT which always gives the operating frequency of DC/DC1.
A dedicated voltage detector is integrated in the first switching converter to monitor DC/DC1 output. When the output voltage of DC/DC1 goes above the threshold, SW1OK is released and goes back to high with configurable delay set by a capacitor on the SW1OKDLY pin.
The linear regulator can work as standby regulator with low Iqor as a non-standby regulator. Connecting its enable ENLDO to its supply VINLDO the regulator works as a standby regulator, while connect...