Regulator Powers DDR Memory

The LTC3634 dual-channel monolithic synchronous step-down regulator provides power supply and bus termination rails for DDR1, DDR2, and DDR3 SDRAM controllers. Operating from a 3.6V to 15V input, the device employs a unique constant frequency and controlled on-time, current mode architecture. Its termination voltage is set to one half of VDDQ down to 0.6V with an accuracy of +1.6%. The combination of a monolithic design and switching frequencies as high as 4 MHz enable the use of tiny, low cost capacitors and inductors. LINEAR TECHNOLOGY CORP., Milpitas, CA. (800) 454-6327.