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

Inductorless Inverter/Positive Doubler Switches Up to 250kHz

Please check latest availability status for a specific part variant.


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.

MAX860, MAX861: Typical Operating Circuit MAX860, MAX861: Typical Operating Circuit Enlarge+

Key Features

  • 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


  • Handheld Instruments (PDAs, Palmtops)
  • Interface Power Supplies
  • Medical Instruments
  • Operational Amplifier Power Supplies
  • Portable Computing
Part NumberTopologyVIN
Unadj. VOUT
Oper. Freq.
Oper. Temp.
minmaxmaxtypSee Notes
-55 to +125
-40 to +85
0 to +70
SOIC (N)/8
$1.17 @1k
MAX861 0.4250
SOIC (N)/8
See All Charge Pumps (45)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 1783 Two AA Cells Power Dual-Supply µP
Tutorial 725 DC-DC Conversion Without Inductors

Quality and Environmental Data

Product Reliability Reports: MAX860.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX860CSA+
  • MAX860CSA+T
  • MAX860ESA+
  • MAX860ESA+T
  • MAX860EUA+
  • MAX860EUA+T
  • MAX860ISA+
  • MAX860ISA+T
  • MAX860IUA+
  • MAX860IUA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


    Related Resources