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

The LTC3867 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.

Applications

* Automotive Systems

* Telecom Systems

* Industrial Equipment

* Distributed DC Power Systems

* 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