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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 70?A at full output load, and less than 5?A 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)

? 40?A Maximum Supply Current (VOUT = 3V @ 30mA)

? 0.5?A 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