LTC3811 Datasheet | Linear Technology

Features High Speed Dual, Multiphase Step-Down DC/DC DESCRIPTION Controller - Fixed Frequency, Peak Current Mode Control - ±0.5% Output Accuracy Over Temperature - Optimized for Low VOUT Applications (Up to 3.3V) - Dual or Single Output, Multiphase Operation - Wide VIN Range: 4.5V to 30V Operation - High Speed Differential Remote Sense Amplifier - Inductor DCR or Sense Resistor Capable - Adjustable Peak Current Sense Voltage: 24m V to 85m V - Very Low Duty Cycle Operation: t ON(MIN) = 65ns (Typ) - Powerful Internal Gate Drivers - Output Voltage Soft-Start, Tracking and Sequencing - Programmable Load Line for Reduced COUT - Clock Input and Output for Up to 12-Phase Operation - Fixed Frequency Operation from 250k Hz to 750k Hz - PLL Synchronization from 150k Hz Up to 900k Hz - Selectable CCM or DCM Operation - Available in 5mm × 7mm QFN and G36 Packages APPLICATIONS - Network Servers - High Current ASIC Supplies - Low Voltage Power Distribution The LTC®3811 is a dual, Poly Phase® synchronous stepdown switching regulator controller optimized for output voltages up to 3.3V. The LTC3811 includes high bandwidth error amplifiers as well as a high speed differential remote sense amplifier. The sense voltage range is programmable from 24m V to 85m V, allowing the use of either the inductor DCR or a discrete sense resistor. Multiphase operation is made possible using the MODE/SYNC input, the CLKOUT output and the PHASEMODE control pin, allowing 1-, 2-, 3-, 4-, 6- or 12-phase operation. Large internal gate drivers minimize switching losses and allow the use of multiple power MOSFETs connected in parallel for high current applications. The operating frequency of the LTC3811 can be programmed from 250k Hz to 750k Hz and can also be synchronized to an external clock using the internal...