RT8871B

® RT8871A/B 4/3/2-Phase PWM Controller for AMD AM2/AM2+/AM3/FM1 CPUs General Description The RT8871A/B is a 4/3/2-phase synchronous buck controller with two integrated MOSFET drivers for CPU power application and a single-phase buck with integrated MOSFET driver for North-Bridge (NB) chipset. The RT8871A/B uses differential inductor DCR current sense to achieve phase current balance and active voltage positioning. Other features include adjustable operating frequency, power good indication, external error-amp compensation, over voltage protection, over current protection and enable/shutdown for various applications. The RT8871A/B comes in a small footprint with WQFN48L 7x7 and WQFN-48L 6x6 packages. Applications z Desktop CPU Core Power z Low Voltage, High Current DC/DC Converter Ordering Information RT8871A/B Package Type QW : WQFN-48L 7x7 (W-Type) QW : WQFN-48L 6x6 (W-Type) (Exposed Pad-Option 1) Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free) A : WQ...