ISL78211 Datasheet, PDF (1/35 Pages) Intersil Corporation – Automotive Single-Phase Core Regulator for IMVP-6™ CPUs

Automotive Single-Phase Core Regulator for
IMVP-6^™ CPUs
ISL78211
The ISL78211 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 ISL78211 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 ISL78211 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
ISL78211 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 ISL78211 commands the CCM operation. When the
CPU enters deeper sleep mode, the ISL78211 enables
the DEM to maximize the efficiency at light load.
Asserting the FDE pin of the ISL78211 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 ISL78211 has 0.8% system voltage
accuracy over entire temperature.
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 ISL78211 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 run time.
The ISL78211 is fully TS16949 compliant and tested to
AEC-Q100 specifications.
Features
• Precision single-phase CORE voltage regulator
- 0.5% system accuracy over -10^°C to 100^°C
temperature range
- 0.8% system accuracy over entire temperature
range
- 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
• TS16949 Compliant
• AEC-Q100 tested
• Pb-free (RoHS compliant)
March 8, 2010
FN7578.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2010. All Rights Reserved. R³ Technology™ is a trademark of Intersil Americas Inc.
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