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MAX8764 - Step-Down Controller

Description

The MAX8764 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high-DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage CPU core or chipset/RAM supplies in notebook computers.

Features

  • Ultrahigh Efficiency.
  • Accurate Current-Limit Option.
  • Quick-PWM with 100ns Load-Step Response.
  • 1% VOUT Accuracy Over Line and Load.
  • 1.8V/2.5V Fixed or 1V to 5.5V Adjustable Output Range.
  • 2V to 28V Battery Input Range.
  • 200/300/450/600kHz Switching Frequency.
  • Adjustable Overvoltage Protection.
  • Adjustable Undervoltage Protection.
  • 1.7ms Digital Soft-Start.
  • Drives Large Synchronous-Rectifier FETs.

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Full PDF Text Transcription

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19-3626; Rev 0; 3/05 MAX8764 High-Speed, Step-Down Controller with Accurate Current Limit for Notebook Computers General Description The MAX8764 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high-DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage CPU core or chipset/RAM supplies in notebook computers. Maxim’s proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. Efficiency is enhanced by an ability to drive very large synchronous-rectifier MOSFETs.
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