ISL95712

Multiphase PWM Regulator for AMD Fusion™ Desktop CPUs Using SVI 2.0

Product Status: Mass Production

OVERVIEW

The ISL95712 is fully compliant with AMD Fusion™ SVI 2.0 and provides a complete solution for microprocessor and graphics processor core power. The ISL95712 controller supports two Voltage Regulators (VRs) for Core and Northbridge outputs. The Core VR can be configured for 4-, 3-, 2-, or 1-phase operation while the Northbridge VR supports 3-, 2- or 1-phase configurations for maximum flexibility. 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 ISL95712 has several other key features. Both outputs support DCR current sensing with a single NTC thermistor for DCR temperature compensation or accurate resistor current sensing. They also utilize remote voltage sense, adjustable switching frequency, OC protection and power-good indicators.

KEY FEATURES

  • Supports AMD SVI 2.0 serial data bus interface and PMBus
  • Serial VID clock frequency range 100kHz to 25MHz
  • Dual output controller with 12V integrated core gate drivers
  • 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-, 3- or 4-phase for the core output and 1- , 2- or 3-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 52 Ld 6x6 QFN package
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL95712
Basic Information
Production Status
Mass Production
Max # of Outputs
2
Max # of Phases
4
Input Voltage Min (V)
11.4
Input Voltage Max (V)
12.6
Output Voltage Min (V)
0.5
Output Voltage Max (V)
1.55
Output Current Max (A)
120
Bias Voltage Range (V)
4.75 to 5.25
VID
Yes
Parametric Applications
AMD FusionT Desktop CPUs Using SVI 2.0
Qualification Level
Standard
Droop
Yes
Integrated MOSFET Driver (s)
Yes
Can Sample
YES
Temperature Range
-40 to +100

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