The ISL6334D controls voltage regulator by driving up to 4

interleaved synchronous-rectified buck channels in parallel.

This multiphase architecture results in multiplying channel

ripple frequency and reducing input and output ripple currents.

Lower ripple results in fewer components, lower cost, reduced

power dissipation, and smaller implementation area.

Microprocessor loads can generate load transients with

extremely fast edge rates and requires high efficiency at light

load. The ISL6334D utilizes Intersil’s proprietary Active

Pulse Positioning (APP), Adaptive Phase Alignment (APA)

modulation scheme, active phase adding and dropping to

achieve and maintain the extremely fast transient response

with fewer output capacitors and high efficiency from light to

full load.

The ISL6334D is designed to be completely compliant with

Intel VR11.1 specifications. It accurately reports the load

current via IMON pin to the microprocessor, which sends an

active low PSI# signal to the controller at low power mode.

The controller then enters 1- or 2-phase operation with diode

emulation option to reduce magnetic core and switching

losses, yielding high efficiency at light load. After the PSI#

signal is de-asserted, the dropped phase(s) are added back

to sustain heavy load transient response and efficiency.

The ISL6334D senses the output current continuously by

utilizing patented techniques to measure the voltage across the

dedicated current sense resistor or the DCR of the output

inductor. Current sensing circuits also provide the needed

signals for channel-current balancing, average overcurrent

protection and individual phase current limiting. An NTC

thermistor’s temperature is sensed via the TM pin and internally

digitized for thermal monitoring and for integrated thermal

compensation of the current sense elements.

A unity gain, differential amplifier is provided for remote voltage

sensing and completely 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 ISL6334D

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 with droop disabled

• Proprietary active pulse positioning (APP) and adaptive

phase alignment (APA) modulation scheme

• Proprietary active phase adding and dropping for high light

load efficiency

• Precision multiphase core voltage regulation

- Differential remote voltage sensing

- ±0.5 closed-loop system accuracy over load, line and

temperature

- Bi-directional, adjustable reference-voltage offset

• Precision resistor or DCR differential current sensing

- Accurate channel-current balancing

- Accurate load current monitoring via IMON pin

• Microprocessor voltage identification input

- Dynamic VID™ technology for VR11.1 requirement

- 8-Bit VID, VR11 compatible

• Average overcurrent protection and channel current limit

• Precision overcurrent protection on IMON pin

• Thermal monitoring and overvoltage protection

• Integrated programmable temperature compensation

• Integrated open sense line protection

• 1- to 4-phase operation, coupled inductor compatibility

• 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)