Overview

The ISL6537 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. Two LDO controllers are also integrated for the GMCH core voltage regulation and for the GMCH and CPU VTT termination voltage regulation. The switching PWM controller drives two N-Channel MOSFETs in a synchronous-rectified buck converter topology. The synchronous buck converter uses voltage-mode 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. Each output is monitored for undervoltage events. The switching regulator also has overvoltage and overcurrent protection. Thermal shutdown is integrated.

ISL6537 Functional Diagram
ISL6537 Functional Diagram
  • Generates 4 Regulated Voltages
  • Synchronous Buck PWM Controller for DDR VDDQ
  • 3A Integrated Sink/Source Linear Regulator with Accurate VDDQ/2 Divider Reference for DDR VTT
  • LDO Regulator for GMCH Core
  • LDO Regulator for CPU/GMCH VTT Termination
  • ACPI Compliant Sleep State Control
  • Glitch-free Transitions During State Changes
  • Integrated VREF Buffer
  • PWM Controller Drives Low Cost N-Channel MOSFETs
  • 250kHz Constant Frequency Operation
  • 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 on All Outputs
  • OCP on the Switching Regulator
  • Integrated Thermal Shutdown Protection
  • Pb-Free Plus Anneal Available (RoHS Compliant)

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

Documentation

= Featured Documentation
Type Title Date
Datasheet
ISL6537 Datasheet
PDF 890 KB
White Paper
How Green is Your Cloud?
PDF 295 KB
Application Note
AN1681: Grounding Techniques
PDF 509 KB
Application Note
AN1684: Nonideality of Ground
PDF 397 KB
Application Note
AN1123: Embedded ACPI Compliant DDR Power Generation Using the ISL6537 and ISL6506
PDF 1.32 MB
5 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Price (USD) | 1ku
    Buy / Sample
    Part Number
    ISL6537CRZ-T
    circleActive
    memory
    spa
    view_in_ar
    Samples Available
    		 QFN Reel 3 Get Samples,
    Parametric Table tips

    Tips for Using This Parametric Table:

    • Hide Filters button in header: Collapse or expands filters
    • Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
    • Reset button in header: Reset all filters to the page default
    • Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
    • Export button in header: Export the filtered results of the table to an Excel document
    • Filter parts search bar in header: Type to filter table results by part number
    • Hide column button in column headers: Select to hide columns in table
    • AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
    • Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
    • Document icon next to product name in row: View the featured document for this product
    • Chip icon next to the right of the document icon in row: View the block diagram for this product
    • Cart icon to the right of the chip icon: Indicates that samples are available for this product