Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

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Dual-Output Step-Down Converter For PDA's and Palmtop Computers

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $4.33
  • Dual, High-Efficiency, Synchronous Rectified Step-Down Converter
  • 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 92% Efficiency
  • 100% (max) Duty Cycle
  • Up to 1.25MHz Switching Frequency
  • Input Voltage Range from +2.7V to +28V
  • 170µA Quiescent Current
  • 5µA Shutdown Current
  • Digital Soft-Start
  • Independent Shutdown Inputs
Additional Details
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The MAX1775 dual, step-down DC-DC converter generates both the main (+3.3V at over 2A) and core (+1.8V at up to 1.5A) supplies for a complete power solution for PDAs, subnotebooks, and other hand-held devices. The main output is adjustable from +1.25V to +5.5V. The core output is adjustable from 1V to 5V. Both switching converters operate at up to 1.25MHz for small external components and use synchronous rectifiers to achieve efficiencies up to 95%. Operation with up to 100% duty cycle provides the lowest possible dropout voltage to extend useful battery life.

The MAX1775 accepts inputs from +2.7V up to +28V, allowing use with many popular battery configurations as well as AC-DC wall adapters. Digital soft-start reduces battery current surges at power-up. Both the main and core converters have separate shutdown inputs. The MAX1775 comes in a small 16-pin QSOP package.

The MAX1775 evaluation kit is available to help reduce design time.


  • Handheld Computers
  • Internet Access Tablets
  • PDAs
  • POS Terminals
  • Subnotebooks
Part Models 2
1ku List Price Starting From $4.33

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1


Evaluation Kit for the MAX1775



Evaluation Kit for the MAX1775

Evaluation Kit for the MAX1775

Features and Benefits

  • +2.7V to +5.5V Input Range
  • Output Voltages
    • +3.3V Output at 1.5A
    • +1.8V Output at 500mA
  • Outputs are Adjustable with Resistors
  • Internal MOSFET Switches (Core Output)
  • 5µA (typ) IC Shutdown Current
  • Switching Frequency Up to 1.25MHz
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Detail

The MAX1775 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a dual step-down switching regulator circuit. The circuit is configured for a main output voltage of +3.3V and a core output voltage of +1.8V. The main output provides up to 1.5A, and the core provides up to 500mA of current.

Power for the circuit can be provided from a +2.7V to +5.5V DC source. The EV kit can be reconfigured for input voltages up to +28V. The core's input can be powered from the input source or, for higher input voltages, from the main output.

The MAX1775 EV kit demonstrates low quiescent current and high efficiency up to 95% for maximum battery life. Operation up to 1.25MHz allows the use of tiny surface-mount components.

Reference Designs

Reference Designs 1


MAXREFDES38#: ECT/EPT Current Fault Sensor

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MAXREFDES38#: ECT/EPT Current Fault Sensor

MAXREFDES38#: ECT/EPT Current Fault Sensor

Features and Benefits

  • High accuracy
  • Low power
  • Accepts 3VP-P single-ended signal or 6VP-P differential signal
  • Optimized layout and size
  • Device drivers
  • Example C source code
  • Test data
View Detailed Reference Design external link

Design & Integration Tools

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