MAX1624 Datasheet | Maxim Integrated

Description The MAX1624/MAX1625 are ultra-high-performance, step-down DC-DC controllers for CPU power in high-end puter 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. The switching frequency is resistor programmable from 100k Hz to 1MHz. High switching frequencies allow the use of a small surface-mount inductor and decrease output filter capacitor requirements, reducing board area and system cost. The MAX1624 is available in a 24-pin SSOP and offers additional features such as a digitally programmable output in 100m V increments; adjustable transient response; selectable 0.5%, 1%, or 2% AC load regulation; and gate drive for a current-boost MOSFET. The MAX1625 is resistor adjustable and es in a 16-pin narrow SO package. Other features in both controllers include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output. For a similar controller patible with the latest Intel VRM/VID specification, see the MAX1638- data sheet. MAX1624/MAX1625 __________Typical Operating Circuit INPUT +5V VCC TO AGND TO VDD VDD CSH ________________________Applications Pentium Pro™, Pentium II™, Power PC™, Alpha™, and K6™ Systems Desktop puters LAN Servers Industrial puters GTL Bus Termination MAX1625 CSL BST PWROK DH N OUTPUT 1.1V TO 4.5V N ______________Ordering Information PART MAX1624EAG MAX1625ESE TEMP. RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 24 SSOP 16 Narrow SO FREQ DL PGND CC2 FB CC1 REF AGND (SIMPLIFIED) Pin Configurations appear at end of data sheet. - Future product. Pentium Pro and Pentium II...