LTC3719

+ U U LTC3719 2-Phase, High Efficiency, Step-Down Controller for AMD Opteron™ CPUs FEATURES s Output Stages Operate Antiphase Reducing Input and Output Capacitance Requirements and Power Supply Induced Noise s Dual Input Supply Capability for Load Sharing s 5-Bit AMD CPU VID Code: VOUT = 0.8V to 1.55V s ±1% Output Voltage Accuracy s True Remote Sensing Differential Amplifier s Power Good Output Voltage Monitor s Supports Active Voltage Positioning s Current Mode Control Ensures Current Sharing s OPTI-LOOP® Compensation Minimizes COUT s Three Operational Modes: PWM, Burst and Cycle Skip s Programmable Fixed Frequency: 150kHz to 300kHz s Wide VIN Range: 4V to 36V Operation s Adjustable Soft-Start Current Ramping s Internal Current Foldback and Short-Circuit Shutdown s Overvoltage Soft Latch Eliminates Nuisance Trips s Available in 36-LUead Narrow (0.209) SSOP Package APPLICATIO S s Servers and Workstations , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc. DESCRIPTIO The LTC®3719 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives two N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitor...