Maxim Integrated MAX1624EAG

General Description

The MAX1624/MAX1625 are ultra-high-performance, step-down DC-DC controllers for CPU power in high-end computer systems. Designed for demanding applications in which output voltage precision and good transient response are critical for proper operation, they deliver over 35A from 1.1V to 3.5V with ±1% total accuracy from a +5V ±10% supply. Excellent dynamic response corrects output transients caused by the latest dynamically clocked CPUs. These controllers achieve over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-channel MOSFETs.

Features

♦ Better than ±1% Output Accuracy Over Line and Load
♦ 90% Efficiency
♦ Excellent Transient Response
♦ Resistor-Programmable Fixed Switching Frequency from 100kHz to 1MHz
♦ Over 35A Output Current
♦ Digitally Programmable Output from 1.1V to 3.5V in 100mV Increments (MAX1624)
♦ Resistor-Adjustable Output down to 1.1V (MAX1625)
♦ Remote Sensing
♦ Adjustable AC Loop Gain (MAX1624)
♦ GlitchCatcher™ Circuit for Fast Load-Transient Response (MAX1624)
♦ Power-Good (PWROK) Output
♦ Current-Mode Feedback
♦ Digital Soft-Start
♦ Strong 2A Gate Drivers
♦ Current-Limited Output

Applications

Pentium Pro™, Pentium II™, PowerPC™, Alpha™, and K6™ Systems
Desktop Computers
LAN Servers
Industrial Computers
GTL Bus Termination