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关于TPS65381输入电压的疑问?



在使用TPS65381时,当输入电压为5V时,TPS65381无法正常工作,5V、3.3V、1.2V 等均没有输出。

当把输入电压调整至5.6V左右时,上电,TPS65381才能正常启动工作,在正常工作时若将输入 电压调低到5V,芯片依然可以正常工作。

查找datasheet,在4.3中提到“R1.1 Input supply voltage range on VBATP pins for initial power up min 5.8 V” 是否指TPS65381启动时电压必须达到5.8V,否则无法正常启动。

而datasheet中提到的
5.8 V to 36 V (CAN, I/O, MCU Core, and Sensor Supply Regulators Functional)
4.5 V to 5.8 V (3.3-V I/O and MCU Core Voltage Functional)  是指用5.8V输入电压启动完成后,芯片可接受的电压范围。

也就是说TPS65381上电时需要5.8V电压?