To: Petz who wrote (86051 ) 7/30/2002 1:54:31 PM From: Joe NYC Read Replies (4) | Respond to Power Supply for AMD® 64-Bit SledgeHammer And ClawHammer CPUslinear.com MILPITAS, CA – April 2, 2002 – Linear Technology Corporation introduces the LTC3719, a PolyPhase™ synchronous step-down controller with integrated MOSFET drivers designed to power AMD’s new 64-bit Hammer CPUs. The LTC3719 offers a 45A single-chip solution by integrating four MOSFET drivers that are capable of driving substantial gate capacitance. The IC offers two power sections that accurately balance the output power between the power components. This precision current sharing reduces thermal stress increasing the reliability of MOSFETs, inductors & capacitors, facilitates thermal management, eliminates hot spots and the need for heat sinks. Furthermore, PolyPhase operation minimizes the requirement for input and output capacitors. A design using the LTC3719 is compact, cost-effective, highly efficient and offers higher system reliability than competing solutions, which do not have precision current sensing. The IC is housed in a 36-lead SSOP package. Core voltage range is from 0.8V to 1.55V and core current can range from 15A to 40A. The LTC3719 can deliver this power at up to 95% efficiency from an input voltage source ranging from 4.5V to 36V. The IC’s accurate current sensing typically provides less than 2% IOUT error between the two channels. The LTC3719 includes protection functions such as current foldback, short-circuit shutdown and an overvoltage soft latch.
