MAX1626

PRODUCTION

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

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • 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

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).

Applications

  • 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
MAX1626
5V/3.3V or Adjustable, 100% Duty Cycle, High-Efficiency, Step-Down DC-DC Controllers
MAX1626, MAX1627: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 2
MAX1649
PRODUCTION 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controller
MAX863
PRODUCTION Dual, High-Efficiency, PFM, Step-Up DC-DC Controller
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Evaluation Kits

MAX1626EVKIT

Evaluation Kit for the MAX1626, MAX1627

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Features and Benefits

  • 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

Product Details

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.
MAX1626EVKIT
Evaluation Kit for the MAX1626, MAX1627

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