GENERAL DESCRIPTION

The ADM660/ADM8660 is a charge-pump voltage converter that can be used to either invert the input supply voltage giving VOUT = –VIN or double it (ADM660 only) giving VOUT = 2 x VIN.

Input voltages ranging from +1.5 V to +7 V can be inverted into a negative –1.5 V to –7 V output supply. This inverting scheme is ideal for generating a negative rail in single power supply systems. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with greater than 90% efficiency are achievable, while 100 mA achieves greater than 80% efficiency.

FEATURES

   ADM660: Inverts or Doubles Input Supply Voltage

   ADM8660: Inverts Input Supply Voltage

   100 mA Output Current

   Shutdown Function (ADM8660)

   2.2 μF or 10 μF Capacitors

   0.3 V Drop at 30 mA Load

   +1.5 V to +7 V Supply

   Low Power CMOS: 600 μA Quiescent Current

   Selectable Charge Pump Frequency (25 kHz/120 kHz)

   Pin Compatible Upgrade for MAX660, MAX665, ICL7660

   Available in 16-Lead TSSOP Package

APPLICATIONS

   Handheld Instruments

   Portable Computers

   Remote Data Acquisition

   Op Amp Power Supplies