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

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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.6
IOUT1 (A) (max) 10
Switch Type External
Preset VOUT (V) 3.3
3.45
3.6
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 350
Package/Pins SSOP/20
Budgetary
Price (See Notes)
4.24
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.6
IOUT1 (A) (max) 10
Switch Type External
Preset VOUT (V) 3.3
3.45
3.6
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 350
Package/Pins SSOP/20
Budgetary
Price (See Notes)
4.24
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Simplified Block Diagram

Technical Docs

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Sampling:
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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.6
IOUT1 (A) (max) 10
Switch Type External
Preset VOUT (V) 3.3
3.45
3.6
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 350
Package/Pins SSOP/20
Budgetary
Price (See Notes)
4.24

Key Features

  • >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™)

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX767, MAX767R, MAX767S, MAX767T: Typical Application Circuit MAX767, MAX767R, MAX767S, MAX767T: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.