View max828-max829 datasheet:

19-0495; Rev 3; 9/99 Switched-Capacitor Voltage Inverters General Description Features The ultra-small MAX828/MAX829 monolithic, CMOS 5-Pin SOT23-5 Package charge-pump inverters accept input voltages ranging 95% Voltage Conversion Efficiency from +1.5V to +5.5V. The MAX828 operates at 12kHz, and the MAX829 operates at 35kHz. Their high efficiency Inverts Input Supply Voltage (greater than 90% over most of the load-current range) 60µA Quiescent Current (MAX828) and low operating current (60µA for the MAX828) make these devices ideal for both battery-powered and board- +1.5V to +5.5V Input Voltage Range level voltage-conversion applications. Requires Only Two Capacitors The MAX828/MAX829 combine low quiescent current and high efficiency. Oscillator control circuitry