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LTC3867 - Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

The LTC®3867 is a current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. Output voltage transient excursions are minimized by use of a nonlinear control architecture to eliminate clock latency issues.

The maximum current sense voltage is programmable from 30mV to 75mV, allowing the use of either a discrete sense resistor or the inductor DCR as the sensing element. Programmable DCR temperature compensation allows constant current limit regardless of inductor temperature. Programmable inductor temperature-based thermal shutdown protects the power components from thermal stress. Soft recovery from output shorts or overcurrent minimizes output overshoot.

The LTC3867 features a precision 0.6V reference and can regulate output voltages up to 14V from a wide 4V to 38V input supply range. The LTC3867 includes a high speed differential remote sense amplifier. Burst Mode® operation, continuous and pulse-skipping modes are supported. The LTC3867 is available in a 24-lead (4mm × 4mm) QFN package.

Features VIN Range: 4V to 38V VOUT Range: 0.6V to 14V Nonlinear Control Architecture Minimizes Output Transient Excursions (Optional) Programmable DCR Temperature Compensation ±0.75% 0.6V Voltage Reference Fixed Frequency Range of 200kHz to 1.2MHz PLL Frequency Synchronization RSENSE or DCR Current Sensing Differential Remote Output Voltage Sense Supports Smooth Start-Up into Pre-Biased Outputs Programmable Soft-Start or VOUT Tracking Hiccup Mode/Soft Recovery from Output Overcurrent 24-Lead (4mm × 4mm) QFN Package Typical Application

Applications Automotive Systems Telecom Systems Industrial Equipment Distributed DC Power Systems Packaging

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