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The ISL68137 is a digital dual output, flexible multiphase (X+Y ≤ 7) PWM controller with AVSBus (Adaptive Voltage Scaling interface). The ISL68137 can be configured to support any desired phase assignments up to a maximum of 7 phases across the 2 outputs (X+Y). For example, 6+1, 5+2, 4+2, 3+3, 3+2, or even a single output operation as a 7+0 configuration are supported. The flexible phase arrangement, combined with PMBus and AVSBus interfaces, allows the device to support any demanding power supply requirement. The ISL68137 with AVSBus complements PMBus by providing a common interface that accelerates point-to-point communication between the controller and the load to statically and dynamically control the processor voltage, thus delivering a balanced and power efficient solution. AVSBus can be used exclusively once the device is configured via PMBus. The ISL68137 utilizes Intersil’s proprietary linear synthetic digital current modulation scheme to achieve the industry’s best combination of transient response and ease of tuning while addressing the challenges of modern multiphase designs.

Device configuration and telemetry monitoring is accomplished using Intersil's intuitive PowerNavigator™ GUI. The ISL68137 device supports on-chip nonvolatile memory to store various configuration settings that are user selectable via pin-strap, giving system designers increased power density to configure and deploy multiple configurations. The device supports an automatic phase add/drop feature to allow maximum efficiency across all load ranges. Thresholds for automatic phase add/drop are user programmable using the powerful PowerNavigator™ GUI.

The ISL68137 supports a comprehensive fault management system to enable the design of highly reliable systems. From a multitiered overcurrent protection scheme, to the configurable power-good and output overvoltage/undervoltage fault thresholds and temperature monitoring, virtually any need is accommodated.

With minimal external components, easy configuration, robust fault management and highly accurate regulation capability, implementing a high performance multiphase regulator has never been easier.

Key Features

• PMBus 1.3 and AVSBus compliant
  • Telemetry - VIN, VOUT, IOUT, power IN/OUT, temperature and various fault status registers
  • Individual AVSBus interface enables high speed voltage changes
• Advanced linear digital modulation scheme
  • Zero latency synthetic current control for excellent HF current balance
  • Dual edge modulation for fastest transient response
• Auto phase add/drop for excellent load vs efficiency profile
• Flexible phase configuration
  • 7+0, 6+1, 5+2, 4+3 phase operation
  • Operation using less than 7 phases between 2 outputs is also supported
• Diode braking for overshoot reduction
• Differential remote voltage sensing supports ±0.5% closed loop system accuracy over load, line and temperature
• Highly accurate current sensing for excellent load line regulation and accurate OCP
  • Supports ISL99227 60A smart power stages
  • Supports DCR sense with integrated temperature compensation
• Supports phase doubler (ISL6617A) for up to 14-phase operation
• Comprehensive fault management enables high reliability systems
  • Pulse-by-pulse phase current limiting
  • Total output current protection
  • Output and input OV/UV
  • Open voltage sense detect
  • Black box recording capability for faults
• Intuitive configuration via PowerNavigator™ GUI
  • NVM to store up to 8 configurations
• Pb-free (RoHS compliant)

Applications

• Networking equipment
• Telecom/datacom equipment
• Server/storage equipment
• Point-of-load power supply (Memory, DSP, ASIC, FPGA)