ISL6532 ACPI Regulator/Controller for Dual Channel DDR Memory Systems

VIN (min) (V)	2.5
VIN (max) (V)	5
VOUT (min) (V)	0.8
VOUT (max) (V)	5
IOUT (max) (A)	20

The ISL6532 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.

The switching PWM controller drives two N-Channel MOSFETs in a synchronous-rectified buck converter topology. The synchronous buck converter uses voltagemode control with fast transient response. Both the switching regulator and integrated standby LDO provide a maximum static regulation tolerance of ±2% over line, load, and temperature ranges. The output is user-adjustable by means of external resistors down to 0.8V.

Switching the memory core output between the PWM regulator and the standby LDO during state transitions is accomplished smoothly via the internal ACPI control circuitry. The NCH signal provides synchronized switching of a backfeed blocking switch during the transitions eliminating the need to route 5V Dual to the memory supply.

An integrated soft-start feature brings VDDQ into regulation in a controlled manner when returning to S0/S1 state from S4/S5 or mechanical off states. During S0 the PGOOD signal indicates that all supplies are within spec and operational. Each output is monitored for under and over-voltage events. Current limiting is included on the VTT and VDDQ standby regulators. Thermal shutdown is integrated.

ISL6532 特点

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 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

ISL6532 应用

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

ISL6532 芯片订购指南

芯片型号	产品状态	温度范围	封装尺寸图	潮湿敏感度等级MSL	美元价格US $
ISL6532CRZ	量产	民用级	20 Ld QFN	3	2.80
ISL6532CRZ-T	量产	民用级	20 Ld QFN T+R	3	2.80
ISL6532EVAL1	量产		评估板	N/A	价格录入中
ISL6532CR	停产	民用级	20 Ld QFN	2	N/A
ISL6532CR-T	停产	民用级	20 Ld QFN T+R	2	N/A