LTC3774 Datasheet | Linear Technology

Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing Features DESCRIPTION n Sub-Milliohm DCR Current Sensing n Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs n Supports Phase Shedding and N+1 Phase Redundancy n Programmable DCR Temperature pensation n ±0.75% Maximum Total DC Output Error Over Temperature n Dual Differential Remote Output Voltage Sense Amplifiers n Phase-Lockable Fixed Frequency Range: 200k Hz to 1.2MHz n VIN Range: 4.5V to 38V n VOUT Range: 0.6V to 3.5V n Supports Smooth Start-Up into Pre-Biased Outputs n Programmable Soft-Start or VOUT Tracking n Hiccup Mode/Soft Recovery from Output Overcurrent n 36-Lead (5mm × 6mm) QFN Package APPLICATIONS n puter Systems n Tele and Data Systems n Industrial Equipment n DC Power Distribution Systems The LTC®3774 is a dual Poly Phase® current mode synchronous step-down switching regulator controller that drives power blocks, DRMOS or external gate drivers and power MOSFETs. It offers an LTC-proprietary technique that enhances the signal-to-noise ratio of the current sense signal, allowing the use of inductors with very low DC winding resistances as the current sense element for maximum efficiency and reduced jitter. The maximum current sense voltage is programmable from 10m V to 30m V. High speed, low offset remote sense differential amplifiers and a precise 0.6V reference provide accurate output voltages between 0.6V and 3.5V from a wide 4.5V to 38V input supply range. Soft recovery from output shorts or overcurrent minimizes output overshoot. Burst Mode® operation, continuous and pulse-skipping modes are supported. The constant operating frequency can be synchronized to an external clock or linearly programmed from 200k Hz to 1.2MHz. Up to six LTC3774 controllers can be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation. The LTC3774 is available in a 36-lead (5mm × 6mm) QFN package. L, LT, LTC, LTM, Linear Technology, the...