VCCS controlled LDO with small on-chip capacitor

A stable LDO (Low Drop-Out linear regulator) using VCCS (Voltage Control Current Source) is presented. The LDO is designed and implemented on GF 2P4M 0.35 μm CMOS technology. Compared with previous compensation scheme, VCCS can implement a real stable LDO with a small on-chip capacitor of 1 pF, whose stability is not affected by the variable ESR (Equivalent Series Resistor). The united gain frequency can achieve 1.5 MHz, improving the transient response. Test result shows that the LDO is stable over the full load current, with a maximum output current of 100 mA.

[1]  K. Entesari,et al.  High PSR Low Drop-Out Regulator With Feed-Forward Ripple Cancellation Technique , 2010, IEEE Journal of Solid-State Circuits.

[2]  Annajirao Garimella,et al.  Reverse Nested Miller Compensation Using Current Buffers in a Three-Stage LDO , 2010, IEEE Transactions on Circuits and Systems II: Express Briefs.

[3]  Chen Jihua,et al.  A fast transient response low dropout regulator with current control methodology , 2011 .

[4]  Mohammad A. Al-Shyoukh,et al.  A Transient-Enhanced Low-Quiescent Current Low-Dropout Regulator With Buffer Impedance Attenuation , 2007, IEEE Journal of Solid-State Circuits.

[5]  Jan M. Rabaey,et al.  Digital Integrated Circuits: A Design Perspective , 1995 .

[6]  Gabriel A. Rincon-Mora,et al.  A low-voltage, low quiescent current, low drop-out regulator , 1998, IEEE J. Solid State Circuits.

[7]  Gaetano Palumbo,et al.  Advances in Reversed Nested Miller Compensation , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[8]  José Silva-Martínez,et al.  A frequency compensation scheme for LDO voltage regulators , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[9]  Bertan Bakkaloglu,et al.  A CMOS Low-Dropout Regulator With Current-Mode Feedback Buffer Amplifier , 2007, IEEE Transactions on Circuits and Systems II: Express Briefs.