ISL6265C_10 Datasheet, PDF (1/27 Pages) Intersil Corporation – Multi-Output Controller with Integrated MOSFET Drivers for AMD SVI Capable Mobile CPUs

Multi-Output Controller with Integrated MOSFET
Drivers for AMD SVI Capable Mobile CPUs
ISL6265C
The ISL6265C is a multi-output controller with embedded
gate drivers. A single-phase controller powers the
Northbridge (VDDNB) portion of the CPU. The two
remaining controller channels can be configured for
two-phase or individual single-phase outputs. For
uniplane CPU applications, the ISL6265C is configured as
a two-phase buck converter. This allows the controller to
interleave channels to effectively double the output
voltage ripple frequency, and thereby reduce output
voltage ripple amplitude with fewer components, lower
component cost, reduced power dissipation, and smaller
area. For dual-plane processors, the ISL6265C can be
configured as independent single-phase controllers
powering VDD0 and VDD1.
The heart of the ISL6265C is the patented R³
Technology™, Intersil’s Robust Ripple Regulator
modulator. Compared with the traditional buck regulator,
the R³ Technology™ has a faster transient response. This
is due to the R³ modulator commanding variable
switching frequency during a load transient.
The Serial VID Interface (SVI) allows dynamic
adjustment of the Core and Northbridge output voltages
independently and in combination from 0.500V to 1.55V.
Core and Northbridge output voltages achieve a 0.5%
system accuracy over-temperature.
A unity-gain differential amplifier is provided for remote
CPU die sensing. This allows the voltage on the CPU die
to be accurately regulated per AMD mobile CPU
specifications. Core output current sensing is realized
using lossless inductor DCR sensing. All outputs feature
overcurrent, overvoltage and undervoltage protection.
Features
• Core Configuration Flexibility
- Dual Plane, Single-Phase Controllers
- Uniplane, Two-Phase Controller
• Precision Voltage Regulators
- 0.5% System Accuracy Over-temperature
• Voltage Positioning with Adjustable Load Line and Offset
• Internal Gate Drivers with 2A Driving Capability
• Differential Remote CPU Die Voltage Sensing
• Core Differential Current Sensing: DCR or Resistor
• Northbridge Lossless r_DS(ON) Current Sensing
• Serial VID Interface
- Two Wire Clock and Data Bus
- Supports High-Speed I²C
- 0.500V to 1.55V in 12.5mV Steps
- Supports PSI_L Power-Saving Mode
• Core Outputs Feature Phase Shedding with PSI_L
• Adjustable Output-Voltage Offset
• Digital Soft-Start of all Outputs
• User Programmable Switching Frequency
• Static and Dynamic Current Sharing (Uniplane Core)
• Overvoltage, Undervoltage, and Overcurrent Protection
• Pb-Free (RoHS compliant)
Applications*(see page 26)
• AMD Griffin Platform CPU
• Notebook Core/GPU Voltage Regulators
Related Literature*(see page 26)
• See FN6884 for “Multi-Output Controller with Integrated
MOSFET Drivers for AMD SVI Capable Mobile CPUs”
Simplified System Diagram
POWER
STAGE
CORE_0
ISL6265C
POWER
STAGE
CORE_1
POWER
STAGE
July 28, 2010
FN6976.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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