max889The MAX889 inverting charge pump delivers a regulated. negative output voltage at loads of up to 200mA. The. device operates with inputs from 2.7V to 5.5V to produce. an adjustable,MAX889 Features o 200mA Output Current o Up to 2MHz Switching Frequency o Small Capacitors (1µF) o +2.7V to +5.5V Input Voltage Range o Adjustable Regulated Negative