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FN9107.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL6217A
Precision Multi-Phase Buck PWM
Controller for Intel, Mobile Voltage
Positioning IMVP-IV™ and IMVP-IV+™
The ISL6217A Multi-Phase Buck PWM controller IC, with
integrated half bridge gate drivers, provides a precision
voltage regulation system for advanced Pentium IV
microprocessors in notebook computers. Two-phase
operation eases the thermal management issues and load
demand of Intel’s latest high performance processors. This
control IC also features both input voltage feed-forward and
average current mode control for excellent dynamic
response, “Loss-less” current sensing using MOSFET
r
DS(ON)
and user-selectable switching frequencies from
250kHz to 1MHz per phase.
The ISL6217A includes a 6-bit digital-to-analog converter
(DAC) that dynamically adjusts the CORE PWM output
voltage from 0.700V to 1.708V in 16mV steps and conforms
to the Intel IMVP-IV™ and IMVP-IV+™ mobile VID
specification. The ISL6217A also has logic inputs to select
Active, Deep Sleep and Deeper Sleep modes of operation. A
precision reference, remote sensing and proprietary
architecture, with integrated, processor-mode, compensated
“Droop”, provide excellent static and dynamic CORE voltage
regulation.
To improve efficiency at light loading, the ISL6217A can be
configured to run in single phase PWM in ACTIVE, DEEP or
DEEPER SLEEP modes of operation. Also, in deep and
deeper sleep modes the ISL6217A will operate in diode
emulation.
Another feature of this IC controller is the PGOOD monitor
circuit that is held low until CORE voltage increases, during
its soft-start sequence, to within 12% of the “Boot” voltage.
This PGOOD signal is masked during VID changes. Output
overcurrent, overvoltage and undervoltage are monitored
and result in the converter latching off and PGOOD signal
being held low.
The overvoltage and undervoltage thresholds are 112% and
84% of the VID, Deep or Deeper Sleep setpoint,
respectively. Overcurrent protection features a 32 cycle
overcurrent shutdown. PGOOD, overvoltage, undervoltage
and overcurrent provide monitoring and protection for the
microprocessor and power system. The ISL6217A IC is
available in a 38 lead TSSOP.
Features
• Diode Emulation Functionality in deep and deeper sleep
modes for improved light load efficiency
• IMVP-IV™ and IMVP-IV+™ Compliant CORE Regulator
• Single and/or Two-phase Power Conversion
• “Loss-less” Current sensing for improved efficiency and
reduced board area
- Optional Discrete Precision Current Sense Resistor
• Internal Gate-Drive and Boot-Strap Diodes
• Precision CORE Voltage Regulation
- 0.8% system accuracy over temperature
• 6-Bit Microprocessor Voltage Identification Input
• Programmable “Droop” and CORE Voltage Slew Rate to
comply with IMVP-IV™ and IMVP-IV+™ specification
• Direct Interface with System Logic (STP_CPU# and
DPRSLPVR) for Deep and Deeper Sleep modes of
operation
• Easily Programmable voltage setpoints for Initial “Boot”,
Deep Sleep and Deeper Sleep Modes
• Excellent Dynamic Response
- Combined Voltage Feed-Forward and Average Current
Mode Control
• Overvoltage, Undervoltage and Overcurrent Protection
• Power-Good Output with internal blanking during VID and
mode changes
• User programmable Switching Frequency of 250kHz -
1MHz per phase
• Pb-Free Plus Anneal Available (RoHS Compliant)
Data Sheet June 30, 2005
