View max660 datasheet:

19-3293; Rev. 2; 9/96 CMOS Monolithic Voltage Converter _______________General Description ___________________________ Features The MAX660 monolithic, charge-pump voltage inverter ¦ Small Capacitors converts a +1.5V to +5.5V input to a corresponding ¦ 0.65V Typ Loss at 100mA Load -1.5V to -5.5V output. Using only two low-cost ¦ Low 120µA Operating Current capacitors, the charge pump’s 100mA output replaces switching regulators, eliminating inductors and their ¦ 6.5? Typ Output Impedance associated cost, size, and EMI. Greater than 90% ¦ Guaranteed ROUT < 15? for C1 = C2 = 10µF efficiency over most of its load-current range combined ¦ Pin-Compatible High-Current ICL7660 Upgrade with a typical operating current of only 120µA provides ideal performance for both battery-powered