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