CMOS Monolithic Voltage Converter

Inverts or Doubles Input Voltage


The MAX660 monolithic, charge-pump voltage inverter converts a +1.5V to +5.5V input to a corresponding-1.5V to -5.5V output. Using only two low-costcapacitors, the charge pump's 100mA output replaces switching regulators, eliminating inductors and their associated cost, size, and EMI. Greater than 90% efficiency over most of its load-current range combined with a typical operating current of only 120µA provides ideal performance for both battery-powered and board-level voltage conversion applications. The MAX660 can also double the output voltage of an input power supply or battery, providing +9.35V at 100mA from a +5V input.

A frequency control (FC) pin selects either 10kHz typ or 80kHz typ (40kHz min) operation to optimize capacitor size and quiescent current. The oscillator frequency can also be adjusted with an external capacitor ordriven with an external clock. The MAX660 is a pin-compatible, high-current upgrade of the ICL7660.

The MAX660 is available in both 8-pin DIP and small-outline packages in commercial, extended, and military temperature ranges.

For 50mA applications, consider the MAX860/MAX861 pin-compatible devices (also available in ultra-small µMAX packages).

Key Features

  • Small Capacitors
  • 0.65V Typ Loss at 100mA Load
  • Low 120µA Operating Current
  • 6.5Ω Typ Output Impedance
  • Guaranteed ROUT < 15Ω for C1 = C2 = 10µF
  • Pin-Compatible High-Current ICL7660 Upgrade
  • Inverts or Doubles Input Supply Voltage
  • Selectable Oscillator Frequency: 10kHz/80kHz
  • 88% Typ Conversion Efficiency at 100mA (IL to GND)


  • Handheld Instruments (PDAs, Palmtops)
  • Interface Power Supplies
  • Laptop Computers
  • Medical Instruments
  • Operational Amplifier Power Supplies
Part Number Topology VIN
Unadj. VOUT
Oper. Freq.
Oper. Temp.
Package/Pins Budgetary
min max max typ See Notes
1.2 5.5 0.5
0.1 80
-40 to +85
0 to +70
$2.98 @1k
See All Charge Pumps (44)
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.

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