HT7660
Features
The MAX1044 and HT7660 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 HT7660 and
LTC1044. Operation is guaranteed from 1.5V to 10V with ● Invert, Double, Divide, or Multiply Input Voltages
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
● Personal Communications Equipment
● Portable Telephones
● Op-Amp Power Supplies
● EIA/TIA-232E and EIA/TIA-562 Power Supplies
● Data-Acquisition Systems
● Hand-Held Instruments
● Panel Meters
Typical Operating Circuit
● BOOST Pin Increases Switching Frequencies (MAX1044)
● Miniature μMAX Package
● 1.5V to 10.0V Operating Supply Voltage Range
● 98% Typical Power-Conversion Efficiency
● No-Load Supply Current: 200μA Max at 5V
● No External Diode Required for Higher-Voltage Operation