Active production, 75 V input ceiling
The LM5574MTX/NOPB: The 75 V maximum input covers 48 V telecom rails, 24 V industrial buses, and 12 V automotive systems with headroom for transients. The 500 mA output suits auxiliary bias supplies, sensor power, and always-on housekeeping rails where a low part count matters.
Switching frequency and thermal envelope
Switching frequency is programmable from 50 kHz to 500 kHz via a single resistor. Lower frequencies reduce switching losses at light load; higher frequencies shrink the inductor and output capacitor footprint at the cost of increased FET dissipation. No synchronous rectifier — the external catch diode handles the low-side current, which simplifies the layout but adds a diode forward-drop loss that matters most at high duty cycles.
16-TSSOP footprint and sourcing posture
ROHS3 compliant per the manufacturer. Active status means it is available through authorized distribution channels; quoted to order against BOM quantities with lead time confirmed at RFQ.