ISL6523

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 . . . . . . . . . . ±1% Over Temperature
- All Other Outputs . . . . . . . . . . . . . ±3% Over Temperature
• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core Output Voltage Selection
- Wide Range . . . . . . . . . . . . . . . . . . . . 1.050V to 1.825V
• Power-Good Output Voltage Monitors
- Separate delayed VTT Power Good
• Overcurrent Fault Monitors
- Switching Regulators Do Not Require Extra Current Sensing Elements, Use MOSFET's rDS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Internal Oscillator
• Pb-free available




Application

• Motherboard Power Regulation for Computers




Pinout






Specifications

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+15V
PGOOD, RT/FAULT, DRIVE, PHASE, and
GATE Voltage . . . . . . . . . . . . . . . . . . .. . . . GND - 0.3V to VCC + 0.3V
Input, Output or I/O Voltage . . . . . . . . . . . . . . . . . . GND -0.3V to 7V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . Class 1
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . .. . . +12V ±10%
Ambient Temperature Range. . . . . . . . . . . . . . . . .. . . . . 0oC to 70oC
Junction Temperature Range. . . . . . . . . . . . . . . . . . . . . 0oC to 125oC




Description

The ISL6523 monitors and precisely controls 4 output voltage levels (Refer to Figures 1, 2, 3). It is designed for microprocessor computer applications with 3.3V, 5V, and 12V bias input from an ATX power supply. The IC has 2 PWM and two linear controllers. The first PWM controller (PWM1) is designed to regulate the microprocessor core voltage (VOUT1).PWM1 controller drives 2 MOSFETs (Q1 and Q2) in a synchronous-rectified buck converter and regulates the core voltage to a level programmed by the 5-bit digital-to-analog converter (DAC). The second PWM controller (P_WM2) is designed to regulate the AGTL+ bus voltage (V_OUT2). PWM2 controller drives a MOSFET (Q3) in a standard buck converter and regulates the output voltage to a level of 1.2V. The two linear controllers supply the 1.5V advanced graphics port (AGP) bus power (V_PUT3) and the 1.8V chipset core power (V_OUT4).