LTC3819 Datasheet | Linear Technology

+ 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs Features - Output Stages Operate Antiphase Reducing Input and Output Capacitance Requirements and Power Supply Induced Noise - Dual Input Supply Capability for Load Sharing - 5-Bit SUN CPU VID Code: VOUT = 1.025V to 1.4125V - ±1% Output Voltage Accuracy - True Remote Sensing Differential Amplifier - Power Good Output Voltage Monitor - Supports Active Voltage Positioning - Current Mode Control Ensures Current Sharing - OPTI-LOOP® pensation Minimizes COUT - Three Operational Modes: PWM, Burst and Cycle Skip - Programmable Fixed Frequency: 150k Hz to 300k Hz - Wide VIN Range: 4V to 36V Operation - Adjustable Soft-Start Current Ramping - Internal Current Foldback and Short-Circuit Shutdown - Overvoltage Soft Latch Eliminates Nuisance Trips - Available in 36-LUead Narrow (0.209) SSOP Package APPLICATIO S - Sun™ Server CPU Supply , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6304066, 5705919. DESCRIPTIO The LTC®3819 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 300k Hz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified. An operating mode select pin (FCB) can be used to select among three modes including Burst Mode® operation for highest efficiency. An internal differential...