MAX767S

5V to 3.3V Output, Synchronous, Step-Down Power Supply Controller

High Precision ±2.5% Supply for Single or Dual Pentium® Systems

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Overview

>90% Efficiency
700µA Quiescent Supply Current
120µA Standby Supply Current
4.5V-to-5.5V Input Range
Low-Cost Application Circuit
All N-Channel Switches
Small External Components
Tiny Shrink-Small-Outline Package (SSOP)
Predesigned Applications:
- Standard 5V to 3.3V DC-DC Converters up to 10A
- High-Accuracy Pentium P54C VR-Spec Supply
Fixed Output Voltages Available:
- 3.3V (Standard)
- 3.45V (High-Speed Pentium™)
- 3.6V (PowerPC™)

The MAX767 is a high-efficiency, synchronous buck controller IC dedicated to converting a fixed 5V supply into a tightly regulated 3.3V output. Two key features set this device apart from similar, low-voltage step-down switching regulators: high operating frequency and all N-channel construction in the application circuit. The 300kHz operating frequency results in very small, low-cost external surface-mount components.

The inductor, at 3.3µH for 5A, is physically at least five times smaller than inductors found in competing solutions. All N-channel construction and synchronous rectification result in reduced cost and highest efficiency. Efficiency exceeds 90% over a wide range of loading, eliminating the need for heatsinking. Output capacitance requirements are low, reducing board space and cost.

The MAX767 is a monolithic BiCMOS IC available in 20-pin SSOP packages. For other fixed output voltages and package options, please consult the factory.

Applications

Local 5V-to-3.3V DC-DC Conversion
Microprocessor Daughterboards
Power Supplies Up to 10A or More

Documentation

Data Sheet 1

MAX767-MAX767T: 5V to 3.3V Output, Synchronous, Step-Down Power Supply Controller Data Sheet (Rev.3) 07/01/2000

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

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX767

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Features and Benefits

Fixed 3.3V Output Voltage ±4%
Up to 1.5A and 5A Output Currents
120µA Standby Supply Current
700µA Quiescent Supply Current
300kHz Switching Frequency
More than 90% Efficiency
20-Pin Shrink-Small-Outline Package
Fully Assembled and Tested

Product Details

The MAX767 evaluation kit (EV kit) is a fully assembled and tested printed circuit board for Maxim's synchronous, step-down power-supply controller. Providing a tightly regulated 3.3V output voltage from a 5V input source, the EV kit contains two separate, complete circuits with conversion efficiencies greater than 90%. The first all-surface-mount circuit can drive loads up to 1.5A, and the second circuit can drive loads up to 5A.