Linear Technology Corp. (LTC, Milpitas, CA) introduced the LTC3733, a PolyPhase® dc/dc synchronous, step-down controller with integrated MOSFET drivers for powering single or multiple AMD® Hammer CPU platforms without requiring heatsinks, while delivering up to 120A of load current. The LTC3733 operates each of its three output channels 120 out of phase to facilitate heat dissipation, reduce MOSFET thermal stress, and minimize input and output capacitor requirements.
The 60A to 120A LTC3733 operates from 6 to 12 phases; is capable of delivering up to 200A of load current; guarantees precision ±5% current matching among its output channels; eliminates the up to ±30% mismatch induced by incorporating MOSFET RDS(ON) sensing or inductor current sensing; varies the output voltage from 0.8V to 1.55V; and adjusts or synchronizes the operating frequency from 250kHz to 600kHz.
The LTC3733 is offered in a narrow (5.2mm), 36-lead, SSOP package, and in a 5mm x 7mm QFN package. Pricing for 1,000-piece quantities starts at $4.35 each.
