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稳压器L4971D不稳定

Other Parts Discussed in Thread: LM22680

输入28V之后,想要输出5V电源,126UH电感两端电压不一样,靠近芯片的OUT脚的一端电压为5V,另一端电压为3V, 需要在126UH电感与芯片的OUT脚之间用任意金属触碰一下,电源才稳定。 L4971D高温55度以上电压不稳定。          请问有哪款芯片能替代L4971D      需求是输入电源28V  输出电压5V  最大输出电流2A