MAX1638 High-Speed Step-Down Controller With Synchronous Rectification For CPU Power

The MAX1638 is an ultra-high-performance, Step-down DC-DC Controller 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, it delivers over 35A from 1.3V 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. This controller achieves over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-Channel MOSFETs
The switching frequency is pin-selectable for 300kHz, 600kHz, or 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 MAX1638 is available in 24-pin SSOP and QSOP (future package) packages, and offers additional features such as a digitally programmab 769 le output; adjustable transient response; and selectable 0.5%, 1%, or 2% AC load regulation. Fast recovery from load transients is ensured by a GlitchCatcher current-boost circuit that eliminates delays caused by the buck inductor. Output overvoltage protection is enforced by a crowbar circuit that turns on the low-side MOSFET with 100% duty factor when the output is 200mV above the normal regulation point. Other features include internal digital soft-start, a power-good output, and a 3.5V 1% reference output.
By Maxim Integrated Products
MAX1638 's PackagesMAX1638 's pdf datasheet
MAX1638VRMEVKIT
MAX1638EAG SSOP
MAX1638EAG-T SSOP
MAX1638EAGT SSOP




MAX1638 Pinout, Pinouts
MAX1638 pinout,Pin out
This is one package pinout of MAX1638,If you need more pinouts please download MAX1638's pdf datasheet.

MAX1638 Application circuits
MAX1638 circuits
This is one application circuit of MAX1638,If you need more circuits,please download MAX1638's pdf datasheet.


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