Current Mode PWM Controller 4A 38-Pin TSSOP

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 rDS(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.

• 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)