The LTC3634 dual-channel monolithic synchronous step-down regulator from Linear Technology provides power supply and bus termination rails for DDR1, DDR2 and DDR3 SDRAM controllers.

The LTC3634 operates from an input voltage from 3.6V to 15V, making it suitable for dual cell Li-Ion applications as well as 5V and 12V intermediate bus systems.

It incorporates a constant frequency/controlled on-time, current mode architecture, which can be used for powering DDR applications from a 12V input supply at high switching frequencies.

Its termination voltage, VTT, is set to ½ of VDDQ down to 0.6V with accuracy of ±1.6%.

Switching frequencies can be up to 4MHz.

Each channel of the LTC3634 uses internal switches with RDS(ON) of only 65mohms and 130mohms to deliver efficiencies as high as 95%.

The two channels run 180 degrees out of phase, minimizing the size of both input and output capacitance. 

www.linear.com/product/LTC3634