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.

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.

特性 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)