ISL62773

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

Product Status: Mass Production

OVERVIEW

The ISL62773 is fully compliant with AMD Fusion™ SVI 2.0 and provides a complete solution for desktop microprocessor and graphics processor core power. The ISL62773 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 ISL62773 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. 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 monitor and thermal monitor
  • Differential remote voltage sensing
  • High efficiency across entire load range
  • Programmable slew rate, VID offset, droop and switching frequency on both outputs
  • OCP/WOC, OVP, PGOOD and thermal monitor
  • Small footprint 48 Ld 6x6 QFN Package
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL62773
Basic Information
Production Status
Mass Production
Max # of Outputs
2
Max # of Phases
3
Input Voltage Min (V)
4.5
Input Voltage Max (V)
25
Output Voltage Min (V)
0.00625
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 Fusion CPU/GPU Core Power, Desktop Computers
Qualification Level
Standard
Droop
Yes
Integrated MOSFET Driver (s)
Yes
Can Sample
YES
Temperature Range
-40 to +100

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