MAX861

PRODUCTION

50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

Inductorless Inverter/Positive Doubler Switches Up to 250kHz

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • 8-Pin, 1.11mm High µMAX Package
  • Invert or Double the Input Supply Voltage
  • Three Selectable Switching Frequencies
  • High Frequency Reduces Capacitor Size
  • 87% Efficiency at 50mA
  • 200µA Quiescent Current (MAX860)
  • 1µA Shutdown Supply Current
  • 600mV Voltage Drop at 50mA Load
  • 12Ω Output Resistance

The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5.5V, or double input voltages ranging from +2.5V to +5.5V. Because of their high switching frequencies, these devices use only two small, low-cost capacitors. Their 50mA output makes switching regulators unnecessary, eliminating inductors and their associated cost, size, and EMI. Greater than 90% efficiency over most of the load-current range, combined with a typical operating current of only 200µA (MAX860), provides ideal performance for both battery-powered and board-level voltage-conversion applications.
A frequency-control (FC) pin provides three switching-frequencies to optimize capacitor size and quiescent current and to prevent interference with sensitive circuitry. Each device has a unique set of three available frequencies. A shutdown (active-low SHDN) pin reduces current consumption to less than 1µA. The MAX860/MAX861 are suitable for use in applications where the ICL7660 and MAX660's switching frequencies are too low. The MAX860/MAX861 are available in 8-pin µMAX® and SO packages.

Applications

  • Handheld Instruments (PDAs, Palmtops)
  • Interface Power Supplies
  • Medical Instruments
  • Operational Amplifier Power Supplies
  • Portable Computing
MAX861
50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX860, MAX861: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Charge Pumps 1
MAX1680
PRODUCTION 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
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