Data Sheet Rev. 2
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Overview

Features and Benefits

  • 7V to 24V Input Range
  • Internal 5V Linear Regulator with 100mA Load Capability
  • Output Voltages
    • 3.3V at 6A (Adjustable from 2V to 5.5V)
    • 5V at 5A (Adjustable from 2V to 5.5V)
    • 12V at 120mA (Adjustable from 1V to 23V)
  • 300kHz Switching Frequency (Selectable 200kHz/300kHz/500kHz)
  • Power-Good Outputs
  • Over- and Undervoltage Protection
  • 32-Pin Thin QFN Package
  • Fully Assembled and Tested

Product Details

The MAX8744A evaluation kit (EV kit) demonstrates the MAX8744A's standard application circuit. This dual-PWM synchronous DC-DC converter steps down high-voltage batteries and/or AC adapters, generating main supplies for notebook computers. The MAX8744A EV kit provides dual 5V and 3.3V output voltages from a 7V to 24V battery input range. It delivers up to 6A output current for the 5V output and 5A for the 3.3V output with 97% efficiency. Both outputs are adjustable between 2V and 5.5V by changing feedback resistors R17–R20.

A transformer on the 5V output and a postregulation LDO generates a 12V auxiliary voltage capable of delivering 120mA. This auxiliary voltage is adjustable between 1V and 23V by changing feedback resistors R3 and R4.

The MAX8744A also has an internal fixed 5V linear regulator capable of supplying 100mA.

The MAX8744A EV kit operates at 300kHz switching frequency.

Applications

  • 2 to 4 Li+ Cell Battery-Powered Devices
  • Main Power Supplies
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators

Documentation & Resources

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