General Description

The TC110 is a step-up (Boost) switching controller that furnishes output currents of up to 300mA while delivering a typical efficiency of 84. The TC110 normally operates in pulse width modulation mode (PWM), but automatically switches to pulse frequency modulation (PFM) at low output loads for greater efficiency. Supply current draw for the 100kHz version is typically only 50µA, and is reduced to less than 0.5µA when the SHDN input is brought low. Regulator operation is suspended during shutdown. The TC110 accepts input voltages from 2.0V to 10.0V, with a guaranteed start-up voltage of 0.9V.

The TC110 is available in a small 5-Pin SOT-23A package, occupies minimum board space and uses small external components (the 300kHz version allows for less than 5mm surface-mount magnetics).

Features

• Assured Start-up at 0.9V

• 50µA (Typ) Supply Current (fOSC = 100kHz)

• 300mA Output Current @ VIN ≥ 2.7V

• 0.5µA Shutdown Mode

• 100kHz and 300kHz Switching Frequency Options

• Programmable Soft-Start

• 84 Typical Efficiency

• Small Package: 5-Pin SOT-23A

Applications

• Palmtops

• Battery-Operated Systems

• Positive LCD Bias Generators

• Portable Communicators