1

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FN6504.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL6336, ISL6336A

6-Phase PWM Controller with Light Load

Efficiency Enhancement and Current

Monitoring

The ISL6336, ISL6336A 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 ISL6336, ISL6336A 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 ISL6336, ISL6336A 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 (ISL6336)

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 ISL6336,

ISL6336A 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 ISL6336,

ISL6336A 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

• Proprietary Active Pulse Positioning and Pin Adaptive

Phase Alignment Modulation Scheme

• Proprietary Active Phase Adding and Dropping with Diode

Emulation for High Efficiency at Light Load

• 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)

Data Sheet

May 28, 2009