lm2940 low voltage difference three-terminal regulator with fixed output voltage; Output voltage 5V; Output current 1A; When the output current is 1A, the minimum input-output voltage difference is less than 0.8V; Maximum input voltage 26V; Operating temperature -40 ~ 125 ℃; Includes static current reduction circuit, current limit, overheat protection, battery reverse connection and reverse insertion protection circuit.