LTC3736-1 Datasheet | Linear Technology

Dual 2-Phase, No RSENSETM, Synchronous Controller with Spread Spectrum Features - Spread Spectrum Operation - Tracking Function - No Current Sense Resistors Required - Out-of-Phase Controllers Reduce Required Input Capacitance - Wide VIN Range: 2.75V to 9.8V - Current Mode Operation - 0.6V ±1.5% Voltage Reference - Low Dropout Operation: 100% Duty Cycle - Pulse Skipping Operation at Light Loads - Internal Soft-Start Circuitry - Power Good Output Voltage Monitor - Output Overvoltage Protection - Micropower Shutdown: IQ = 9µA - Tiny Low Profile (4mm × 4mm) QFN and Narrow SSOP Packages U APPLICATIO S - One or Two Lithium-Ion Powered Devices - Notebook and Palmtop puters, PDAs - Portable Instruments - Distributed DC Power Systems , LTC and LT are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178, 5929620, 6144194, 6580258, 6304066, 6611131, 6498466. DESCRIPTIO The LTC®3736-1 is a 2-phase dual synchronous stepdown switching regulator controller with tracking that drives external plementary power MOSFETs using few external ponents. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out of phase. A unique spread spectrum architecture randomly varies the LTC3736-1’s switching frequency from 450k Hz to 580k Hz, significantly reducing the peak radiated and conducted noise on both the input and output supplies, making it easier to ply with electromagnetic interference (EMI) standards. Pulse skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems. The high switching frequencies allow for the use of small surface mount inductors and...