11‐4: 3.55‐Watt Output Power LTPS TFT DCDC Converter for Actuators on Wearable Devices on Flexible Substrate

Abstract

In this work, a high‐power LTPS DCDC converter on flexible polyimide substrate is demonstrated. The diode‐based boost‐ converter upconverts its output voltage to 9V from a 3.3V source and can reliably supply a load range of 100mA to 400mA. The efficiency of the design is reaching 54.9%. The design contains 400.000 25μm/4.5μm TFTs, resulting in a complete footprint of 10.02cm2. The DCDC converter is suitable for driving high‐power actuators on flexible wearables devices. Moreover, this work reports 3.24 ampere current through the LTPS TFT in the DCDC converter resulting in sub‐Ω ON‐resistance.