ISL6523A is a power control chip produced by ISL company. It integrates two PWM controllers, two linear controllers, as well as 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 delayed-rising 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 output voltages are normal.
The ISL6523A is an integrated power system controller designed for high-performance microprocessor and computer applications. It provides control and protection for four output voltages by integrating two PWM controllers and two linear regulators within a 28-pin SOIC package.
One PWM controller regulates the microprocessor core voltage using a synchronous-rectified buck converter, while the second supplies the AGTL+ bus power with a standard buck converter. The device also includes linear regulators for the AGP bus and chipset/core memory circuits.
| Ambient Temperature Range | 0°C to 70°C |
|---|---|
| Junction Temperature Range | 0°C to 125°C |
| Core PWM Output Voltage Range | 1.050V to 1.825V |
| Core PWM Output Voltage Accuracy | +1% Over Temperature |
| Other Outputs Regulation Tolerance | +3% Over Temperature |
The device operates with a constant frequency of 200kHz.
No, it uses the voltage drop across the upper MOSFET's RDS(ON) to monitor output current.
The IC is integrated into a 28-pin SOIC package.