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ISL6523A Datasheet Vrm8.5 Dual Pwm And Dual Linear Power System Controller

Manufacturer: Intersil (now Renesas)

Overview: ISL6523A TM Data Sheet February 2002 FN9063 VRM8.5 Dual PWM and Dual Linear Power System Controller The ISL6523A provides the power control and protection for four output voltages in high-performance microprocessor and computer applications. The IC integrates two PWM controllers and two linear controllers, as well as the monitoring and protection functions into a 28-pin SOIC package. One PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. The second PWM controller supplies the computer system’s AGTL+ 1.2V bus power with a standard buck converter. The linear controllers regulate power for the 1.5V AGP bus and the 1.8V power for the chipset core voltage and/or cache memory circuits. The ISL6523A includes an Intel VRM8.5 compatible, TTL 5-input digital-to-analog converter (DAC) that adjusts the microprocessor core-targeted PWM output voltage from 1.050V to 1.825V in 25mV steps. The precision reference and voltage-mode control provide ±1% static regulation. The second PWM controller’s output provides a voltage level of 1.2V with ±3% accuracy. The linear regulators use external N-channel MOSFETs or bipolar NPN pass transistors to provide fixed output voltages of 1.5V ±3% (VOUT3) and 1.8V ±3% (VOUT4). The ISL6523A monitors all the output voltages. A delayedrising VTT (standard buck output) Power Good signal is issued before the core PWM starts to ramp up. Another system Power Good signal is issued when the core is within ±10% of the DAC setting and all other outputs are above their under- voltage levels. Additional built-in overvoltage protection for the core output uses the lower MOSFET to prevent output voltages above 115% of the DAC setting. The PWM controllers’ overcurrent function monitors the output current by using the voltage drop across the upper MOSFET’s rDS(ON) , eliminating the need for a current sensing resistor.

Key Features

  • Provides 4 Regulated Voltages - Microprocessor Core, AGTL+ Bus, AGP Bus Power, and North/South Bridge Core.
  • Drives N-Channel MOSFETs.
  • Linear Regulator Drives Compatible with both MOSFET and Bipolar Series Pass Transistors.
  • Simple Single-Loop Control Designs - Voltage-Mode PWM Control.
  • Fast PWM Converter Transient Response - High-Bandwidth Error Amplifiers - Full 0% to 100% Duty Ratios.
  • Excellent Output Voltage Regulation - Core PWM Output.

Similar Datasheet

Brand Logo Part Number Description Manufacturer
Renesas Logo ISL6523 VRM8.5 Dual PWM and Dual Linear Power System Controller Renesas

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ISL6590 Digital Multi-Phase PWM Controller for Core-Voltage Regulation
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ISL6523A Distributor