General Description

The TC125/126 step-up (Boost) switching regulators furnish output currents to a maximum of 80mA (VIN = 2V, VOUT = 3V) with typical efficiencies above 80. These devices employ pulse frequency modulation (PFM) for minimum supply current at low loads. They are ideal for battery-operated applications powered from one or more cells. Maximum supply current is less than 70µA at full output load, and less than 5µA in standby (VOUT = 3V). Both devices require only an external inductor, diode, and capacitor to implement a complete DC/DC regulator.

Features

• Assured Start-up at 0.9V

• PFM (100kHz Max Operating Frequency)

• 40µA Maximum Supply Current (VOUT = 3V @ 30mA)

• 0.5µA Shutdown Mode (TC125)

• Voltage Sense Input (TC126)

• Requires Only Three External Components

• 80mA Maximum Output Current

• Small Package: 5-Pin SOT-23A

Applications

• Palmtops/PDAs

• Battery-Operated Systems

• Cameras

• Portable Communicators