Description
The SC488 is a combination switching regulator and linear source/sink regulator intended for DDR1/2 memory systems. The purpose of the switching regulator is to generate the supply voltage, VDDQ, for the memory system. It is a pseudo-fixed frequency constant on-time controller designed for high efficiency, superior DC accuracy, and fast transient response. The purpose of the linear source/sink regulator is to generate the memory termination voltage, VTT, with the ability to source and sink 2.8A peak currents.

FEATUREs
♦ Constant On-Time Controller for Fast Dynamic Response on VDDQ
♦ DDR1/DDR2/DDR3 Compatible
♦ VDDQ = Fixed 1.8V or 2.5V, or Adjustable From 1.5V to 3.0V
♦ 1.5% Internal Reference (2.5% System Accuracy)
♦ Resistor Programmable On-Time for VDDQ
♦ VCCA/VDDP Range = 4.5V to 5.5V
♦ VIN Range = 2.5V to 25V
♦ VDDQ DC Current Sense Using Low-Side RDS(ON) Sensing
♦ External RSENSE in Series with Low-Side FET
♦ Cycle-by-Cycle Current Limit for VDDQ
♦ Digital Soft-Start for VDDQ
♦ Analog Soft-Start for VTT/REF
♦ Smart Over-Voltage VDDQ Protection
♦ Combined EN and PSAVE Pin for VDDQ
♦ Over-Voltage/Under-Voltage Fault Protection
♦ Power Good Output
♦ Separate VCCA and VDDP Supplies
♦ VTT/REF Range = 0.75V – 1.5V
♦ VTT Source/Sink 2.8A Peak
♦ Internal Resistor Divider for VTT/REF
♦ VTT is High Impedance in S3
♦ VDDQ, VTT, REF are Actively Discharged in S4/S5
♦ 24 Lead MLPQ (4x4 mm) Lead-Free Package
♦ Product Is Fully WEEE and RoHS Compliant

APPLICATIONs
♦ Notebook Computers
♦ CPU I/O Supplies
♦ Handheld Terminals and PDAs
♦ LCD Monitors
♦ Network Power Supplies