MAX1730

PRODUCTION

50mA, Regulated, Step-Down Charge Pump for 1.8V or 1.9V Logic

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • > 85% Peak Efficiency
  • 50mA Guaranteed Output Current
  • Dual-Mode 1.8V or 1.9V Output
  • ±3% Output Voltage Accuracy
  • Up to 2MHz Operating Frequency
  • Small 0.22µF Capacitors
  • No Inductor Required
  • 2.7V to 5.5V Input Voltage Range
  • Output Disconnects from Input in Shutdown Mode
  • Small 10-Pin µMAX Package (1.09mm max height)

The MAX1730 regulated step-down charge pump generates up to 50mA at fixed output voltages of 1.8V or 1.9V from an input voltage in the 2.7V to 5.5V range. Specifically designed to provide high-efficiency logic supplies in applications that demand a compact design, the MAX1730 employs fractional conversion techniques to provide efficiency exceeding that of a linear regulator.

The MAX1730 operates at up to 2MHz, permitting the use of small 0.22µF flying capacitors while maintaining low 75µA quiescent supply current. Proprietary soft-start circuitry prevents excessive current from being drawn from the supply during startup, making the MAX1730 compatible with higher impedance sources such as alkaline and lithium-ion cells.

The MAX1730 is available in a space-saving 10-pin µMAX® package that is only 1.09mm high and occupies one-half the area of an 8-pin SO.

Applications

  • Handheld Instruments (PDAs, Palmtops)
  • Low-Voltage Logic Supplies
  • PC Cards
  • PDAs
  • Wireless Handsets
MAX1730
50mA, Regulated, Step-Down Charge Pump for 1.8V or 1.9V Logic
MAX1730: Typical Operating Circuit
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Documentation

Data Sheet 1

Design Note 1

Technical Articles 2

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