ISL6277A: Multiphase PWM Regulator for AMD Fusion™ Mobile CPUs Using SVI 2.0

The ISL6277A is fully compliant with AMD Fusion SVI 2.0 and provides a complete solution for microprocessor and graphics processor core power. The ISL6277A controller supports two Voltage Regulators (VRs) with three integrated gate drivers and two optional external drivers for maximum flexibility. The Core VR can be configured for 3-, 2-, or 1-phase operation while the Northbridge VR supports 2- or 1-phase configurations. The two VRs share a serial control bus to communicate with the AMD CPU and achieve lower cost and smaller board area compared with two-chip solutions.

The PWM modulator is based on Intersil’s Robust Ripple Regulator R3™ Technology. Compared to traditional modulators, the R3™ modulator can automatically change switching frequency for faster transient settling time during load transients and improved light load efficiency.

The ISL6277A has several other key features. Both outputs support DCR current sensing with single NTC thermistor for DCR temperature compensation or accurate resistor current sensing. Both outputs utilize remote voltage sense, adjustable switching frequency, OC protection and power-good.

Key Features
  • Supports AMD SVI 2.0 serial data bus interface
    • Serial VID clock frequency range 100kHz to 25MHz
  • Dual output controller with integrated drivers
    • Two dedicated core drivers
    • One programmable driver for either Core or Northbridge
  • Precision voltage regulation
    • 0.5% system accuracy over-temperature
    • 0.5V to 1.55V in 6.25mV steps
    • Enhanced load line accuracy
  • Supports multiple current sensing methods
    • Lossless inductor DCR current sensing
    • Precision resistor current sensing
  • Programmable 1-, 2- or 3-phase for the core output and 1- or 2-phase for the Northbridge output
  • Adaptive body diode conduction time reduction
  • Superior noise immunity and transient response
  • Output current and voltage telemetry
  • Differential remote voltage sensing
  • High efficiency across entire load range
  • Programmable slew rate
  • Programmable VID offset and droop on both outputs
  • Programmable switching frequency for both outputs
  • Excellent dynamic current balance between phases
  • Protection: OCP/WOC, OVP, PGOOD and thermal monitor
  • Small footprint 48 Ld 6x6 QFN package
    • Pb-free (RoHS compliant)
Applications
  • AMD fusion CPU/GPU core power
  • Notebook computers
Typical Diagram
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL6277A DatasheetPDF04 Dec 20151010 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL6277AHRZ48 Ld QFN0.102483260RoHS
ISL6277AHRZ-T48 Ld QFN T+R0.102483260RoHS
ISL6277AIRZ48 Ld QFN0.102483260RoHS
ISL6277AIRZ-T48 Ld QFN T+R0.102483260RoHS
Datasheet
ISL6277A Datasheet 04 Dec 2015
Other
ISL6277A
48 Ld QFN T+R ISL6267
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017