Abstract
For the portable applications, how to maintain the battery life and provide a clean DC voltage are very important. Therefore, the battery life and the stability of the voltage are interrelated to the power management techniques. This thesis presents a simple and systematic approach to design of a sliding mode controlled buck DC-DC converters operating in continuous conduction mode (CCM) with integrated power switches and a fully current sensor, adjustable hysteresis band for the feedback controlled. This controlled sliding mode achieves fast transient response and wide LC (L=3~30μH, C=2~350μF) tolerance without external off-chip compensator. The operating frequency is from 300kHz to 1MHz with supply voltage from 2.5V to 5.5V, which is suitable for lithium-ion battery supply applications. The load current is from 5mA~1A, and the switching frequency is constant under all operating condition with proposed adjustable hysteresis band controlled.