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5V/3.3V or Adjustable, 100% Duty Cycle, High-Efficiency, Step-Down DC-DC Controllers

Efficient, Low-Cost, Step-Down Controllers Ideally Suitable for 1.5V CPU I/O Power

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 3
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.87
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 3
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.87

Key Features

  • Reduce External Components and Total Cost
    • 300KHz PWM Switching Reduces Component Size
    • Tiny Surface-Mount Inductor
  • Reduce Power Dissipation
    • > 90% Efficiency from 3mA to 2A Loads
    • Low Dropout Voltage
    • 100% Maximum Duty Cycle
  • Reduce Number of DC-DC Controllers to Stock
    • Wide 2.6V to 16.5V Input Voltage Options
    • Selectable 3.3V and 5V or Adjustable 1.3V to 16V Output Voltage Options
  • Reduce System Power Consumption
    • 90µA Max Quiescent Current
    • 1µA Max Shutdown Current
  • Operates Reliably in Adverse Environment
    • Soft-Start Limits Startup Current
    • Current-Limited Control Scheme
  • Increase Design Flexibility
    • External P-Channel MOSFET Allows Output Power of > 12.5W

Applications/Uses

  • 5V to 3.3V Green PC Applications
  • Battery-Powered Applications
  • Handheld Computers
  • High-Efficiency Step-Down Regulation
  • Low-Cost Notebook Computer Supplies
  • Minimum Component DC-DC Converters
  • PCMCIA Power Supplies
  • PDAs and Other Handheld Devices
  • Portable Terminals

Description

The MAX1626/MAX1627 step-down DC-DC controllers operate over a 2.6V to 16.5V input voltage range. The controllers deliver load current from 1mA to more than 2A. The MAX1626 has pin-selectable 3.3V and 5V outputs. The MAX1627 supports adjustable outputs from 1.3V to 16V.

A unique current-limited, pulse-frequency-modulation (PFM) control scheme operates up to 100% duty cycle, resulting in very low dropout voltage. This control scheme eliminates minimum load requirements and reduces supply current under light loads to 90µA (versus 2mA to 10mA for common pulse-width modulation controllers).

The devices are available in a 8-pin SOIC package (-40°C to +85°C) and dice (0°C to +70°C).

Simplified Block Diagram

MAX1626, MAX1627: Typical Operating Circuit MAX1626, MAX1627: Typical Operating 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.