The Texas offers a TPS series device with a low-noise synchronous step-down dc-dc converter that is ideally suited for systems powered from a 1-cell li-ion battery or from a 2- to 3-cell nicd, nimh, or alkaline battery. It operates typically down to an input voltage of 1.8 V. High efficiency synchronous step down
Output current up to 300 mA
Pin programmable current limit