Maxim Integrated ICL7662CBA+T, 1 Linear Voltage, Voltage Regulator 0.02 (Typ.)A, -2.5 V 8-Pin, SO

The 1CL7662/Si7661 is a monolithic charge pump voltage inverter that will convert a positive voltage in the range of +4.5V to +20V to the corresponding negative voltage of -4.5V to -20V. The ICL7662/Si7661 provides performance far superior to previous implementations of charge pump voltage inverters by combining low quiescent current with high efficiency. The ICL7662/Si7661 has an oscillator, control circuitry, and 4 power MOS switches on-chip, with the only required external components being two low cost Capacitors.

+4.5 V to +20V Supply to -45V to -20V Output
Cascaded Voltage Multiplication (Vout = -nV+)
99.7% Typical Open Circuit Conversion Efficiency
Required Only 2 External Capacitors
Pin compatible with the ICL7660
Application
Inexpensive Negative Supplies
Data Acquisition Systems
Up to -20V for OP Amp, and other Liner Circuits
Supply Splitter, Vout = Vs/2