Obsolete — sourcing the LM2576HVT-15 for production
The LM2576HVT-15 is officially obsolete per the manufacturer's lifecycle record. Read the PCN before you buy — date-code provenance matters here; mystery stock surfacing years after the official end-of-life needs careful validation.
3 A, 60 V input, fixed 15 V output — what the ratings mean
The LM2576HVT-15 is a fixed 15 V output version of the SIMPLE SWITCHER buck regulator family. It delivers 3 A continuous output from a 4 V to 60 V input rail, making it a fit for 24 V and 48 V industrial bus voltages, as well as unregulated supplies that can swing above 48 V. The 52 kHz switching frequency is low by modern standards, which means the external inductor will be physically larger than what a higher-frequency switcher needs — but the trade-off is simpler layout and generally lower EMI.
TO-220-5 through-hole package
It requires a board-level heatsink or a thermal pad to the chassis for dissipating the heat from the 3 A output at higher input-output differentials. The five-pin layout — input, output, ground, feedback, and on/off — is standard for the SIMPLE SWITCHER family, but the fixed-output version ties the feedback pin internally, so no external resistor divider is needed. The tab is typically connected to ground or left floating; confirm the tab potential against your system's grounding scheme before committing the PCB.
No synchronous rectifier — external Schottky required
The LM2576HVT-15 does not integrate a synchronous rectifier, so an external Schottky diode is mandatory for the buck topology. The diode must be rated for the peak inductor current and the input voltage. A 3 A, 60 V Schottky in a DO-201AD or similar axial package is the typical companion part. The 52 kHz switching frequency gives the diode a relatively long conduction interval, so the diode's forward voltage drop directly affects efficiency — a low-Vf Schottky pays off here.