⎯ An integrated voltage-mode boost converter that starts up at 0.9V is successfully implemented in a standard 3.3/5V 0.6μm CMOS process with V tn =0.7V and |V tp |=0.8V. The special features are: (1
) a near-threshold soft-start circuit that keeps maximum inrush current under control; (2) a slew rate enhanced error amplifier that achieves stable response over a wide range of supply voltage; and (3) a capacitor multiplier in implementing the compensation capacitor that reduces die area. Maximum efficiency of 93% is achieved at an output power of 260mW.
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