ISL6334B, ISL6334C
O BS O L E
TE PROD
RECOMM
UCT
E ND E D R
E P L ACE M
ENT PAR
ISL6334,
T
ISL6334A
DATASHEET
FN6689
Rev 3.00
May 5, 2016
VR11.1, 4-Phase PWM Controller with Light Load Efficiency Enhancement and
Load Current Monitoring Features
The
ISL6334B, ISL6334C
control microprocessor core
voltage regulation 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 require high efficiency at light
load. The ISL6334B, ISL6334C 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 ISL6334B, ISL6334C is designed to be compliant to
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.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6334B,
ISL6334C 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. The sensed current flows out of FB pin to develop the
precision voltage drop across the feedback resistor for droop
control. Current sensing circuits also provide the needed
signals for channel-current balancing, average overcurrent
protection and individual phase current limiting. A NTC
thermistor’s temperature is sensed via 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 ISL6334B,
ISL6334C 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 (APP) and Adaptive
Phase Alignment (APA) Modulation Scheme
• Proprietary Active Phase Adding and Dropping with Diode
Emulation Scheme For Enhanced 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 Load-Line (Droop) Programming
- 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)
FN6689 Rev 3.00
May 5, 2016
Page 1 of 31
ISL6334B, ISL6334C
Controller and Driver Recommendation
CONTROLLER
ISL6334B
ISL6334C
COMMENTS
When PSI# is asserted low, the operating channels send a special PWM protocol that can be recognized only by the dedicated
VR11.1 drivers ISL6622/ISL6620 for Diode Emulation (DCM) operation. The disabled channels remain in tri-state.
When PSI# is asserted low, the operating channels send normal CCM PWM that can be recognized by any Intersil driver,
such as ISL6612/ISL6614, ISL6596, ISL6609, ISL6610, and even ISL6622/ISL6620. The disabled channels remain in
tri-state.
DRIVER
ISL6622
ISL6622A
ISL6620, ISL6620A
ISL6612, ISL6612A
ISL6596, ISL6609
ISL6614, ISL6614A
ISL6610
GATE
DRIVE
VOLTAGE
12V
12V
5V
12V
5V
12V
5V
# OF
GATE
DRIVES
Dual
Dual
Dual
Dual
Dual
Quad
Quad
DIODE
EMULATION
(DE)
Yes
Yes
Yes
No
No
No
No
GATE DRIVE
DROP
(GVOT)
Yes
No
No
No
No
No
No
COMMENTS
For PSI# channel and its coupled channel in coupled
inductor applications or all channels
For PSI# channel and its coupled channel in coupled
inductor applications or all channels.
For PSI# channel and its coupled channel in coupled
inductor applications or all channels
For dropped phases or all channels with ISL6334C
For dropped phases or all channels with ISL6334C
For dropped phases or all channels with ISL6334C
For dropped phases or all channels with ISL6334C
NOTE: Intersil 5V and 12V drivers are mostly pin-to-pin compatible and allow for dual footprint layout implementation to optimize MOSFET selection
and efficiency. Dual = One Synchronous Channel; Quad = Two Synchronous Channels.
FN6689 Rev 3.00
May 5, 2016
Page 3 of 31
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