LTC3732 Datasheet | Linear Technology

3-Phase, 5-Bit VID, 600k Hz, Synchronous Buck Switching Regulator Controller Features DESCRIPTIO s 3-Phase Current Mode Controller with Onboard MOSFET Drivers s ±5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs s 4.5V ≤ VCC ≤ 7V; 4.5V ≤ VIN ≤ 32V s Differential Amplifier Accurately Senses VOUT s Reduced Input and Output Capacitance s Reduced Power Supply Induced Noise s VID DAC Programmable from 1.1V to 1.85V (VRM9.0/9.1) s ±10% Power Good Output Indicator s 250k Hz to 600k Hz Per Phase, PLL, Fixed Frequency s PWM, Stage Shedding TM or Burst Mode® Operation s OPTI-LOOP® pensation Minimizes COUT s Adjustable Soft-Start Current Ramping s Short-Circuit Shutdown Timer with Defeat Option s Overvoltage Soft Latch s Small 36-Lead Narrow (0.209") SSOP Package s QFN 5mm × 7mm U38-Lead Package APPLICATIO S s Desktop puters s High Performance Notebook puters s High Output Current DC/DC Power Supplies The LTC®3732 is a Poly Phase® synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 600k Hz per phase to minimize the RMS current losses in both the input and output filter capacitors. The 3phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for high efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode technology. A differential amplifier provides true remote sensing of both the high and low side of the output voltage at load points. Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. A foldback current circuit also provides protection for the external MOSFETs under short-circuit or overload conditions. , LTC...