DESCRIPTION
The LTC®1261 is a switched-capacitor voltage inverter designed to provide a regulated negative voltage from a single positive supply. The LTC1261CS operates from a single 3V to 8V supply and provides an adjustable output voltage from –1.25V to –8V. An on-chip resistor string allows the LTC1261CS to be configured for output voltages of –3.5V, –4V, –4.5V or –5V with no external components. The LTC1261CS8 is optimized for applications which use a 5V or higher supply or which require low output voltages. It requires a single external 0.1µF capacitor and provides adjustable and fixed output voltage options in 8-lead SO packages.

FEATURES
■ Regulated Negative Voltage from a Single Positive Supply
■ Can Provide Regulated –5V from a 3V Supply
■ REG Pin Indicates Output is in Regulation
■ Low Output Ripple: 5mV Typ
■ Supply Current: 600µA Typ
■ Shutdown Mode Drops Supply Current to 5µA
■ Up to 15mA Output Current
■ Adjustable or Fixed Output Voltages
■ Requires Only Three or Four External Capacitors
■ Available in SO-8 Packages

APPLICATIONS
■ GaAs FET Bias Generators
■ Negative Supply Generators
■ Battery-Powered Systems
■ Single Supply Applications