LTC3861 Datasheet | Linear Technology

Features Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing Description n Operates with Power Blocks, Dr MOS or External Gate Drivers and MOSFETs n Constant-Frequency Voltage Mode Control with Accurate Current Sharing n ±0.75% 0.6V Voltage Reference n Dual Differential Output Voltage Sense Amplifiers n Multiphase Capability- Up to 12-Phase Operation n Programmable Current Limit n Safely Powers a Prebiased Load n Programmable or PLL-Synchronizable Switching Frequency Up to 2.25MHz n Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor n VCC Range: 3V to 5.5V n VIN Range: 3V to 24V n Power Good Output Voltage Monitor n Output Voltage Tracking Capability n Programmable Soft-Start n Available in a 36-Pin 5mm × 6mm QFN Package Applications n High Current Distributed Power Systems n DSP, FPGA and ASIC Supplies n Data and Tele Systems n Industrial Power Supplies L, LT, LTC, LTM, Poly Phase, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194, 5055767 The LTC®3861 is a dual Poly Phase® synchronous stepdown switching regulator controller for high current distributed power systems, digital signal processors, and other tele and industrial DC/DC power supplies. It uses a constant-frequency voltage mode architecture bined with very low offset, high bandwidth error amplifiers and a remote output sense differential amplifier per channel for excellent transient response and output regulation. The controller incorporates lossless inductor DCR current sensing to maintain current balance between phases and to provide overcurrent protection. The chip operates from a VCC supply between 3V and 5.5V and is designed for stepdown conversion from VIN between 3V and 24V to output voltages between 0.6V and VCC - 0.5V. The...