ISL6537A ACPI Regulator/Controller for Dual Channel DDR Memory Systems

VIN (min) (V)	4.5
VIN (max) (V)	5.5
VOUT (min) (V)	0.8
VOUT (max) (V)	VIN
IOUT (max) (A)

The ISL6537A 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 to supply VDDQ during S0/S1 and S3 states. During S0/S1 state, 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. A second PWM controller, which requires external MOSFET drivers, is available for regulation of the GMCH Core voltage. An LDO controller is also integrated for the CPU VTT termination voltage regulation and the DAC.

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. The switching regulator provides 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.

An integrated soft-start feature brings all outputs into regulation in a controlled manner when returning to S0/S1 state from any sleep state. During S0 the VIDPGD signal indicates that the GMCH and CPU VTT termination voltage is within spec and operational.

All outputs, except VDAC, have undervoltage protection. The switching regulator also has overvoltage and overcurrent protection. Thermal shutdown is integrated.

ISL6537A 特点

Generates 5 Regulated Voltages
- Synchronous Buck PWM Controller for DDR VDDQ
- 3A Integrated Sink/Source Linear Regulator with Accurate VDDQ/2 Divider Reference for DDR VTT
- PWM Regulator for GMCH Core
- LDO Regulator for CPU/GMCH VTT Termination
- LDO Regulator for DAC
ACPI Compliant Sleep State Control
Glitch-Free Transitions During State Changes
Integrated VREF Buffer
VDDQ PWM Controller Drives Low Cost N-Channel MOSFETs
250kHz Constant Frequency Operation
- Both PWM Controllers are Phase Shifted 180°
Tight Output Voltage Regulation
- All Outputs: ±2% Over Temperature
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
Under and Overvoltage Monitoring
OCP on the VDDQ Switching Regulator
Integrated Thermal Shutdown Protection
Pb-Free Plus Anneal Available (RoHS Compliant)

ISL6537A 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

ISL6537A 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 $
ISL6537A-6506EVAL1Z	量产		评估板	N/A	价格录入中
ISL6537ACRZ	量产	民用级	28 Ld QFN	3	3.32
ISL6537ACRZ-T	量产	民用级	28 Ld QFN T +R	3	3.32
ISL6537ACRZA	量产	民用级	28 Ld QFN	3	价格录入中
ISL6537ACRZA-T	量产	民用级	28 Ld QFN T +R	3	价格录入中
ISL6537ACR	停产	民用级	28 Ld QFN	2	N/A
ISL6537ACR-T	停产	民用级	28 Ld QFN T +R	2	N/A