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