Single-Phase Core Regulator for IMVP-6®
The ISL6261A is a single-phase buck regulator
implementing lntel® IMVP-6® protocol, with embedded gate
drivers. lntel® Mobile Voltage Positioning (IMVP) is a smart
voltage regulation technology effectively reducing power
dissipation in lntel® Pentium processors.
The heart of the ISL6261A is the patented R3 Technology™,
Intersil’s Robust Ripple Regulator modulator. Compared with
the traditional multi-phase buck regulator, the R3
Technology™ has faster transient response. This is due to
the R3 modulator commanding variable switching frequency
during a load transient.
The ISL6261A provides three operation modes: the
Continuous Conduction Mode (CCM), the Diode Emulation
Mode (DEM) and the Enhanced Diode Emulation Mode
(EDEM). To boost battery life, the ISL6261A changes its
operation mode based on CPU mode signals DPRSLRVR
and DPRSTP#, and the FDE pin setting, to maximize the
efficiency. In CPU active mode, the ISL6261A commands
the CCM operation. When the CPU enters deeper sleep
mode, the ISL6261A enables the DEM to maximize the
efficiency at light load. Asserting the FDE pin of the
ISL6261A in CPU deeper sleep mode will enable the EDEM
to further decrease the switching frequency at light load and
increase the regulator efficiency.
A 7-bit Digital-to-Analog Converter (DAC) allows dynamic
adjustment of the core output voltage from 0.300V to 1.500V.
The ISL6261A has 0.5% system voltage accuracy over
A unity-gain differential amplifier provides remote voltage
sensing at the CPU die. This allows the voltage on the CPU
die to be accurately measured and regulated per lntel®
IMVP-6 specification. Current sensing can be implemented
through either lossless inductor DCR sensing or precise
resistor sensing. If DCR sensing is used, an NTC thermistor
network will thermally compensates the gain and the time
constant variations caused by the inductor DCR change.
The ISL6261A provides the power monitor function through
the PMON pin. PMON output is a high-bandwidth analog
voltage signal representing the CPU instantaneous power.
The power monitor function can be used by the system to
optimize the overall power consumption, extending battery
November 5, 2009
• Precision single-phase CORE voltage regulator
- 0.5% system accuracy over temperature
- Enhanced load line accuracy
• Internal gate driver with 2A driving capability
• Microprocessor voltage identification input
- 7-Bit VID input
- 0.300V to 1.500V in 12.5mV steps
- Support VID change on-the-fly
• Multiple current sensing schemes supported
- Lossless inductor DCR current sensing
- Precision resistive current sensing
• Thermal monitor
• Power monitor indicating CPU instantaneous power
• User programmable switching frequency
• Differential remote voltage sensing at CPU die
• Overvoltage, undervoltage, and overcurrent protection
• Pb-free (RoHS compliant)
(Notes 2, 3)
(Pb-Free) DWG. #
ISL6261ACRZ ISL6261 ACRZ -10 to +100 40 Ld 6x6 QFN L40.6x6
ISL6261ACRZ-T* ISL6261 ACRZ -10 to +100 40 Ld 6x6 QFN L40.6x6
Tape and Reel
ISL6261AIRZ 6261A IRZ -40 to +100 40 Ld 6x6 QFN L40.6x6
ISL6261AIRZ-T* 6261A IRZ
-40 to +100 40 Ld 6x6 QFN L40.6x6
Tape and Reel
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-
free material sets, molding compounds/die attach materials, and
100% matte tin plate plus anneal (e3 termination finish, which is
RoHS compliant and compatible with both SnPb and Pb-free
soldering operations). Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information
page for ISL6261A. For more information on MSL please see
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2007, 2009. All Rights Reserved. R3 Technology™ is a trademark of Intersil Americas Inc.
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