LTC3802

U U LTC3802 Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking FEATURES s Wide VIN Range: 3V to 30V Operation with Line Feedforward Compensation s Leading Edge Modulation Architecture for Extremely Low Duty Cycle Operation s Phase-Lockable Fixed Frequency: 330kHz to 750kHz s Two 180° Out-of-Phase Controllers s Fast Programmable Power-Up/-Down Tracking s Programmable Current Limit Without External Current Sense Resistor s Optional Burst Mode® Operation at Light Load s ±1% 0.6V Voltage Reference s External N-Channel MOSFET Architecture s Low Shutdown Current: <100µA s Overvoltage Protection and PGOOD Flag s Small 28-Lead SSOP and 32-Lead QFN Packages U APPLICATIO S s Notebook and Palmtop Computers s Portable Instruments s Battery-Operated Digital Devices s DC Power Distribution Systems DESCRIPTIO The LTC®3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out of phase. The synchronous buck architecture automatically shifts to Burst Mode operation as the output load decreases, ensuring maximum efficiency over a wide range of load curren...