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MAX1774 - Dual / High-Efficiency / Step-Down Converter

General Description

The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices.

It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package.

Key Features

  • Dual, High-Efficiency, Synchronous-Rectified Step-Down Converters.
  • Thin, Small (1mm High) QFN Package.
  • Step-Up Converter for Backup Battery.
  • Main Power Adjustable from +1.25V to +5.5V Over 2A Load Current Up to 95% Efficiency.
  • Core Power Adjustable from 1V to 5V Internal Switches Up to 1.5A Load Current Up to 91% Efficiency.
  • Automatic Main Battery Switchover.
  • 100% (max) Duty Cycle.
  • Up to 1.25MHz Switching Frequency.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-1810; Rev 2; 12/03 EVAALVUAAILTAIOBNLEKIT Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover MAX1774 General Description The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package. The MAX1774 accepts inputs from +2.7V to +28V and provides an adjustable main output from 1.25V to 5.5V at over 2A. The secondary core converter delivers an adjustable voltage from 1V to 5V and can deliver up to 1.5A. Both the main and core regulators have separate shutdown inputs. When the AC adapter power is removed, an external Pchannel MOSFET switches input to the main battery.