Four 400mA/600mA rails from a single 5.5 V input
The LTC3562EUD#PBF is a quad-output synchronous buck regulator from Analog Devices that packs four independent step-down converters into a 20-pin QFN package measuring 3 mm by 3 mm. Each of the four outputs delivers either 400 mA or 600 mA, with the higher-current channel typically assigned to the core rail and the lower-current channels to I/O or auxiliary supplies. The 2.25 MHz switching frequency keeps the inductor values around 1 µH to 2.2 µH, which saves board area in space-constrained portable and battery-powered designs. Each output is adjustable down to 0.425 V and up to 3.78 V, which spans the common core voltages for FPGAs, SoCs, and low-voltage digital logic as well as 1.8 V, 2.5 V, and 3.3 V I/O rails.
The part ships in Tube form. The ROHS3 compliance is consistent with current lead-free assembly requirements; no special handling beyond standard MSL precautions is called out in the listing.
Output voltage flexibility for multi-rail designs
The output is adjustable and programmable. The minimum output voltage is 0.425 V, and the maximum is 3.78 V. This means a single LTC3562 can generate a 1.0 V core rail, a 1.8 V DDR termination rail, a 2.5 V analog rail, and a 3.3 V I/O rail from one input supply. The 0.425 V floor is low enough for the latest deep-submicron FPGA cores that run at 0.9 V or 0.85 V, though the 400 mA per-channel limit means the designer must budget the current draw before assigning rails.
Buyers should qualify the part for new designs with the usual PCN monitoring in place.