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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

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).

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
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 16
IOUT1 (A) (max) 3
Switch Type External
Preset VOUT (V) -
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$1.64 @1k
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Simplified Block Diagram

MAX1626, MAX1627: Typical Operating Circuit MAX1626, MAX1627: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX1626 evaluation kit (EV kit) provides a selectable 3.3V or 5V output voltage. The MAX1626 has a high-switch duty cycle of up to 100%, allowing the external P-channel transistor to turn on fully. The 100% duty cycle and a low 100mV current-sense level permit very low dropout voltages. The circuit is configured to deliver up to 2A of output current with greater than 90% conversion efficiency.

This EV kit is a fully assembled and tested surface-mount circuit board. It can also be used to evaluate the MAX1627, which has an adjustable output voltage. Additional pads on the bottom of the board accommodate the external feedback resistors for setting different output voltages.

View Details

Features

  • Selectable 3.3V or 5V Output Voltage
  • Low Dropout Voltage
  • 100% Max Duty Cycle
  • 2A Output Current
  • 16.5V Max Input Voltage
  • 1µA Max Shutdown Current
  • 90µA Max IC Supply Current
  • Up to 300kHz Switching Frequency
  • 8-Pin SO, Surface-Mount Construction
  • Fully Assembled and Tested

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 16
IOUT1 (A) (max) 3
Switch Type External
Preset VOUT (V) -
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$1.64 @1k

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