The TC1682/TC1683/TC1684 are CMOS charge pump
converters that provide an inverted doubled output
from a single positive supply. An on-board oscillator
provides the clock and only three external capacitors
are required for full circuit implementation. Switching
frequencies are 12kHz for the TC1682, 35kHz for the
TC1683, and 125kHz for the TC1684. When the SHDN
pin is held at a logic high, the device goes into a very
low power mode of operation consuming less than 1μA
(typ) of supply current.
Low output source impedance (typically 120Ω),
provides output current up to 10mA. The TC1682/
TC1683/TC1684 feature a 1.8V to 5.5V operating
voltage range and high efficiency, which make them an
ideal choice for a wide variety of applications requiring
a negative doubled voltage derived from a single
positive supply (for example: generation of -7.2V from
a +3.6V lithium cell or -10V generated from a +5V logic
supply).
The minimum external part count, small physical size
and shutdown mode feature make this family of
products useful for a wide variety of negative bias
power supply applications.