LTC3861-1 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 Differential Remote Output Voltage Sense Amplifier 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 32-Pin 5mm × 5mm QFN Package Applications n High Current Distributed Power Systems n DSP, FPGA and ASIC Supplies n Data and Tele Systems n Industrial Power Supplies The LTC®3861-1 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 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. Inductor current reversal is disabled during soft-start to safely power prebiased loads. The constant operating frequency can be synchronized to an external clock or linearly programmed from 250k Hz to 2.25MHz. Up to six LTC3861-1 controllers can operate in...