1a buck voltage regulators lm2575 national semiconductor lm2575t 5 0 step down voltage regulator 5v output voltage single output 1a output current 4 voltage accuracy 8v to 40v supply voltage 52khz switching frequency 40 deg c to 125 deg c 5 to 220 case the lm2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step down buck switching regulator capable of driving a 1a load with excellent line and load regulation suitable for