max889The MAX889 IC is an inverting charge pump that delivers a regulated negative output voltage at loads up to 200mA. The device operates from an input of +2.7V to +5.5V to produce a userMAX889RESA+T Analog Devices Maxim Integrated Switching Voltage Regulators Hh-Frequency, Regulated, 200mA, Invert datasheet, inventory, & pricing.