Area- and power-efficient DC-DC converter with on-chip compensation

A dual-path capacitor multiplier (DPCM) technique is proposed for on-chip frequency compensation. The DPCM uses two currents to charge and discharge a compensation capacitor concurrently. Consequently, the equivalent capacitance is amplified dramatically with slight increase in silicon area and power. Thanks to the DPCM, the transient response of the DC-DC converter has improved significantly because of the small compensation capacitor. Experimental results demonstrate converter stability and transient response. The transient recovery time of a 450 mA step load change is <;30 μs. With the proposed technique, the compensation capacitor is shrunk significantly and adding the compensation resistor would have helped in improving transient response.