General Description

The FAN5068 DDR memory regulator combines a highefficiency PWM controller to generate the supply voltage, VDDQ, and a linear regulator to generate VTT, the termination voltage. Synchronous rectification provides high-efficiency over a wide range of load currents. Efficiency is further enhanced by using the low-side MOSFET’s RDS(ON) to sense current instead of a series sense resistor.

Features

• PWM regulator for VDDQ (2.5V or 1.8V)

• Linear LDO regulator generates VTT = VDDQ/2, 1.5A Peak sink/source capability

• 1 independent programable ULDO controllers driving external N-Channel MOSFET

• ACPI drive and control for 5V DUAL generation

• 3.3V Internal LDO for 3V-ALW generation

• 300kHz fixed frequency switching

• RDS(ON) current sensing or optional current sense resistor for precision over-current detect

• Internal Synchronous Boot diode

• Power Good signal for all voltages

• Input Under-Voltage Lock-Out (UVLO)

• Thermal Shutdown

• Latched Multi-Fault Protection

• 24-pin 5x5mm MLP package

Applications

• DDR-1/DDR-2 VDDQ and VTT voltage generation with ACPI support

• Desktop PCs

• Servers