ISL6336B Datasheet, PDF (1/31 Pages) Intersil Corporation – 6-Phase PWM Controller with Light Load Efficiency Enhancement and Current Monitoring

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Data Sheet
August 31, 2010
ISL6336B
FN6696.2
6-Phase PWM Controller with Light Load
Efficiency Enhancement and Current
Monitoring
The ISL6336B controls microprocessor core voltage
regulation by driving up to 6 interleaved synchronous-rectified
buck channels in parallel. Multiphase buck converter
architecture uses interleaved timing to multiply channel ripple
frequency and reduce input and output ripple currents. Lower
ripple results in fewer components, lower component cost,
reduced power dissipation, and smaller implementation area.
Microprocessor loads can generate load transients with
extremely fast edge rates and require high efficiency over
the full load range. The ISL6336B utilizes Intersil’s
proprietary Active Pulse Positioning (APP) and Adaptive
Phase Alignment (APA) modulation scheme and a
proprietary active phase dropping/adding and diode
emulation scheme to achieve extremely fast transient
response with fewer output capacitors and high efficiency
from light load to full load.
The ISL6336B is compliant with Intel’s VR11.1 specification.
Features include a pin (IMON) for current monitoring and a
Power State Indicator (PSI#) input pin to initiate a proprietary
phase dropping and diode emulation scheme for higher
efficiency at light load by dropping to 1- or 2-phase operation
with optional diode emulation to reduce switching and core
losses in the converter. After the PSI# signal is de-asserted,
the dropped phase(s) are added back to sustain heavy load
transient and efficiency.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6336B
senses the output current continuously by utilizing patented
techniques to measure the voltage across a dedicated
current sense resistor or the DCR of the output inductor.
Current sensing provides the needed signals for precision
droop, channel-current balancing, and overcurrent
protection. A programmable integrated temperature
compensation function is implemented to effectively
compensate the temperature variation of the current sense
element. A current limit function provides overcurrent
protection for the individual phase.
A unity gain, differential amplifier is provided for remote voltage
sensing and eliminates any potential difference between
remote and local grounds. This improves regulation and
protection accuracy. The threshold-sensitive enable input is
available to accurately coordinate the start up of the ISL6336B
with any other voltage rail. Dynamic-VID™ technology allows
seamless on-the-fly VID changes. The offset pin allows
accurate voltage offset settings that are independent of VID
setting.
Features
• Intel VR11.1 Compliant
• H_CPURST_N Input to Eliminate Required Extensive
External Circuitry for Proper PSI# Operation of Intel’s
Eaglelake Chipset Platforms
• Proprietary Active Pulse Positioning and Pin Adaptive
Phase Alignment Modulation Scheme
• Proprietary Active Phase Adding and Dropping with Diode
Emulation for Enhanced Light Load Efficiency
• Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and
Temperature
- Bi-Directional Adjustable Reference-Voltage Offset
• Precision Resistor or DCR Current Sensing
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Accurate Current Monitoring Output Pin (IMON)
• Microprocessor Voltage Identification Input
- Dynamic VID™ Technology
- 8-Bit VID Input With VR11 Code
• Thermal Monitor and OV Protection with OVP Output
• Average Overcurrent Protection and Channel-Current Limit
• Precision Overcurrent Protection on IMON Pin
• Integrated Open Sense Line Protection
• Integrated Programmable Temperature Compensation
• 1- to 6-Phase Operation; Coupled Inductor Compatible
• Adjustable Switching Frequency up to 1MHz Per Phase
• Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
• Pb-Free (RoHS Compliant)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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