MAX1639

PRODUCTION

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power

High-Accuracy, High-Efficiency CPU Power Supply Delivers >35A

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $5.78

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Overview

Better than ±1% Output Accuracy Over Line and Load
Greater than 90% Efficiency Using N-Channel MOSFETs
Pin-Selected High Switching Frequency: 300kHz, 600kHz, or 1MHz
Over 35A Output Current
Resistor-Divider Adjustable Output from 1.1V to 4.5V
Current-Mode Control for Fast Transient Response and Cycle-by-Cycle Current-Limit Protection
Short-Circuit Protection with Foldback Current Limiting
Crowbar Overvoltage Protection
Power-Good (PWROK) Output
Digital Soft-Start
High-Current (2A) Drive Outputs

The MAX1639 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 1.1V to 4.5V 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.

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. The MAX1639 is available in a 16-pin narrow SOIC package.

Applications

Computers: Desktop, Workstation, Server
GTL Bus Termination
LAN Servers
Local DC-DC Converters for CPUs
Workstations

Part Models: 2
1ku List Price: Starting From $5.78

Documentation

Data Sheet 1

MAX1639: High-Speed Step-Down Controller with Synchronous Rectification for CPU Power Data Sheet (Rev.1) 10/13/2005

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1639ESE+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1639ESE+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 7, 2023 - 2361C WAFER FAB
		pcn_2361c
MAX1639ESE+	PRODUCTION
MAX1639ESE+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 2
MAX1638	PRODUCTION	High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
MAX1624		High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power

Evaluation Kits

Evaluation Kit the MAX1639

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Features and Benefits

+4.5V to +5.5V Input Voltage Range
2.5V Output Voltage (1.1V to 4.0V adjustable)
8A Output Current
Power-Good Output
600kHz Switching Frequency
16-Pin Narrow SO Package
Fully Assembled and Tested

Product Details

The MAX1639 evaluation kit (EV kit) provides a 2.5V output voltage from a +4.5V to +5.5V input supply. It delivers up to 8A output current with greater than 90% efficiency. Features include pin-selectable switching frequencies of 300kHz, 600kHz, and 1MHz, as well as current-mode operation for superior load- and line-transient response. This EV kit operates at 600kHz switching frequency. It can also be used to evaluate other output voltages by changing the feedback resistors R2 and R3.

This EV kit is fully assembled and tested, and is offered in a 16-pin narrow SO package.