LTC3775

FEATURES n Wide VIN Range: 4.5V to 38V n Line Feedforward Compensation n Low Minimum On-Time: tON(MIN) < 30ns n Powerful Onboard MOSFET Drivers n Leading Edge Modulation Voltage Mode Control n ±0.75%, 0.6V Reference Voltage Accuracy Over Temperature n VOUT Range: 0.6V to 0.8VIN n Programmable, Cycle-by-Cycle Peak Current Limit n Sense Resistor or RDS(ON) Current Sensing n Programmable Soft-Start n Synchronizable Fixed Frequency from 250kHz to 1MHz n Selectable Pulse-Skipping or Forced Continuous Modes of Operation n Low Shutdown Current: 14μA Typical n Thermally Enhanced 16-Lead MSOP and 3mm × 3mm QFN Packages APPLICATIONS n Automotive Systems n Telecom and Industrial Power Supplies n Point of Load Applications LTC3775 High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller DESCRIPTION The LTC®3775 is a high efficiency synchronous step-down switching DC/DC controller that drives an all N-channel power MOSFET stage from a 4.5V to 38V input supply voltage. A patented line feedforward compensation circuit and a high bandwidth error amplifier provide very fast line and load transient response. High step-down ratios are made possible by a low 30ns minimum on-time, allowing extremely low duty cycles. MOSFET RDS(ON) current sensing maximizes efficiency. Alternatively, a sense resistor can be used for higher current limit accuracy. Continuous monitoring of the voltages across the top and bottom MOSFETs allows cycle-by-cycle control of the inductor current, configurable by ext...