5 V fixed rail, 1.5 A continuous
The L7805ABV-DG is a 5 V fixed-output linear regulator from STMicroelectronics, rated for 1.5 A continuous output current in a TO-220 through-hole package. It is a workhorse part for generating a clean +5 V rail from a higher unregulated DC input, typical in industrial control boards, motor-drive auxiliary supplies, and test equipment where a switching regulator's ripple is unacceptable. With a maximum input voltage of 35 V and a dropout voltage of 2 V typ at 1 A load, the input rail must stay above 7 V to maintain regulation under full load. The 68 dB PSRR at 120 Hz provides solid line-frequency ripple rejection, important for analog front-end supplies.
Dropout and thermal headroom
The 2 V dropout at 1 A is typical for a standard NPN-pass linear regulator. The LDFPVR adjustable LDO offers 1 A output with 62 dB PSRR at 120 Hz, but its 16 V max input and adjustable output suit a different design target.