Switched-Capacitor Voltage Converters

The MAX1044 and ICL7660 are monolithic, CMOS switched-capacitor voltage converters that invert, double, divide, or multiply a positive input voltage. They are pin compatible with the industry-standard ICL7660 and LTC1044. Operation is guaranteed from 1.5V to 10V with no external diode over the full temperature range. They deliver 10mA with a 0.5V output drop. The MAX1044 has a BOOST pin that raises the oscillator frequency above the audio band and reduces external capacitor size requirements.

The MAX1044/ICL7660 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a -5V supply from a +5V logic supply to power analog circuitry. For applications requiring more power, the MAX660 delivers up to 100mA with a voltage drop of less than 0.65V.

Applications

* -5V Supply from +5V Logic Supply * Data Acquisition * EIA/TIA-232E and EIA/TIA-562 Power Supplies * Handheld Instruments (PDAs, Palmtops) * Op-Amp Power Supplies * Panel Meters * Personal Communications Equipment * Portable Telephones

* Miniature µMAX Package

* 1.5V to 10.0V Operating Supply Voltage Range

* 98% Typical Power-Conversion Efficiency

* Invert, Double, Divide, or Multiply Input Voltages

* BOOST Pin Increases Switching Frequencies (MAX1044)

* No-Load Supply Current: 200µA Max at 5V

* No External Diode Required for Higher-Voltage Operation