LTC1929-PG

U U FEATURES s 2-Phase Single Output Controller s Reduces Required Input Capacitance and Power Supply Induced Noise s Current Mode Control Ensures Current Sharing s Phase-Lockable Fixed Frequency: 150kHz to 300kHz s True Remote Sensing Differential Amplifier s OPTI-LOOPTM Compensation Improves Transient Response s ±1% Output Voltage Accuracy s Power Good Output Voltage Monitor (LTC1929-PG) s Wide VIN Range: 4V to 36V Operation s Very Low Dropout Operation: 99% Duty Cycle s Adjustable Soft-Start Current Ramping s Internal Current Foldback s Short-Circuit Shutdown Timer with Defeat Option s Overvoltage Soft-Latch Eliminates Nuisance Trips s Available in 28-Lead SSOP Package U APPLICATIO S s Desktop Computers s Internet/Network Servers s Large Memory Arrays s DC Power Distribution Systems LTC1929/LTC1929-PG 2-Phase, High Efficiency, Synchronous Step-Down Switching Regulators DESCRIPTIO The LTC®1929/LTC1929-PG are 2-phase, single output, synchronous step-down current mode switching regulator controllers that drive N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 2-phase controllers drive their two output stages out of phase at frequencies up to 300kHz 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 ...