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The HIP6521 provides the power control and protection for four output voltages in high-performance microprocessor and computer applications. The IC integrates a voltage-mode PWM controller and three linear controllers, as well as monitoring and protection functions into a 16 Ld SOIC package. The PWM controller is intended to regulate the microprocessor memory core voltage with a synchronous-rectified buck converter. The linear controllers are intended to regulate the computer system’s AGP 1.5V bus power, the 2.5V clock power, and the 1.8V power for the North/South Bridge core voltage and/or cache memory circuits. Both the switching regulator and linear voltage references provide ?2 of static regulation over line, load, and temperature ranges. All outputs are user-adjustable by means of an external resistor divider. All linear controllers employ bipolar NPNs for the pass transistors.

Features

? Provides 4 Regulated Voltages

- Memory Core, AGP, Clock, and Memory Controller Hub Power

? ACPI Compatible

? Drives Bipolar Linear Pass Transistors

? Externally Resistor-Adjustable Outputs

? Simple Single-Loop Control Design

- Voltage-Mode PWM Control

? Fast PWM Converter Transient Response

- High-Bandwidth Error Amplifier

- Full 0 to 100 Duty Ratio

? Excellent Output Voltage Regulation

- All Outputs: ?2 Over Temperature

? Overcurrent Fault Monitors

- Switching Regulator Does Not Require Extra Current Sensing Element, Uses MOSFET’s rDS(ON)

? Small Converter Size

- 300kHz Constant Frequency Operation

- Small External Component Count

? Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

? Motherboard Power Regulation for Computers