tps63020带负载能力不行

Question 1: Vi=3.6v, the input current is less than 1A, it is suspected that there is a problem with the chip, there is a virtual solder, re-welding, the voltage can be stabilized, but the output current is always up to 1A.
Question 2: What is the cause of the chip whistling?
Question 3: Is there a problem with grounding? The circuit diagram is as follows

Johnsin Tao：

Hi你能参考datasheet上的layout:www.ti.com.cn/…/tps63020.pdfPowerpad必须大面积接GND,对于电流能力下降，你或要注意：电感饱和电流足够，功率路径尽量小。

user5344113：

回复 Johnsin Tao:

question1：我就是参考了那个布局画出来的

question2:我用的就是1uh的电感，饱和电流是4A,另外我换了1.5uh的电感试了一下，饱和电流5A,效果不太明显，可以bang我看一下有什莫问题

Vental Mao：

回复 user5344113:

你上传的图片看不了，重新传一下吧

user5344113：

回复 Vental Mao:

user5344113：

回复 Vental Mao:

这有什么问题吗

Vental Mao：

回复 user5344113:

你的地线走的有问题，红色圆圈内，也就是电感下，不建议走地。其次你的反馈电阻接FB的反馈线太长，容易引入干扰