ACPI Regulator/Controller for Dual Channel DDR Memory Systems

The ISL6532B provides a complete ACPI compliant power solution for up to 4 DIMM dual channel DDR/DDR2 memory systems. Included are both a synchronous buck controller and integrated LDO to supply VDDQ with high current during S0/S1 states and standby current during S3 state. During Run mode, a fully integrated sink-source regulator generates an accurate (VDDQ/2) high current VTT voltage without the need for a negative supply. A buffered version of the VDDQ/2 reference is provided as VREF.

Features
• Generates 2 Regulated Voltages
    - Synchronous Buck PWM Controller with Standby LDO
    - 3A Integrated Sink/Source Linear Regulator with Accurate VDDQ/2 Divider Reference
    - Glitch-free Transitions During State Changes
• ACPI Compliant Sleep State Control
• Integrated VREF Buffer
• PWM Controller Drives Low Cost N-Channel MOSFETs
• 250kHz Constant Frequency Operation
• Tight Output Voltage Regulation
    - Both Outputs: ±2% Over Temperature
• 5V or 3.3V Down Conversion
• Fully-Adjustable Outputs with Wide Voltage Range: Down to 0.8V supports DDR and DDR2 Specifications
• Simple Single-Loop Voltage-Mode PWM Control Design
• Fast PWM Converter Transient Response
• Over Current Protection on VTT and Under/Over-Voltage Monitoring of Both Outputs
• Integrated Thermal Shutdown Protection
• QFN Package Option
    - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
        Flat No Leads - Product Outline
    - QFN Near Chip Scale Package Footprint; Improves
        PCB Efficiency, Thinner in Profile
• Pb-free available

Applications
• Single and Dual Channel DDR Memory Power Systems in ACPI compliant PCs
• Graphics cards - GPU and memory supplies
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies