A Capacitor-Less CMOS Active Feedback Low-Dropout Regulator With Slew-Rate Enhancement for Portable On-Chip Application

A low-dropout regulator for on-chip application with active feedback and a slew-rate enhancement circuit to minimize compensation capacitance and speed up transient response is presented in this brief. The idea has been modeled and experimentally verified in a standard 0.35-¿m CMOS process. The total compensation capacitance is 7 pF. From experimental results, the implemented regulator can operate from a supply voltage of 1.8-4.5 V with a minimum dropout voltage of 0.2 V at a maximum 100-mA load and I Q of 20 ¿A.

[1]  T. Karnik,et al.  Area-efficient linear regulator with ultra-fast load regulation , 2005, IEEE Journal of Solid-State Circuits.

[2]  Ka Nang Leung,et al.  A Low-Dropout Regulator for SoC With $Q$-Reduction , 2007, IEEE Journal of Solid-State Circuits.

[3]  K. Leung,et al.  A capacitor-free CMOS low-dropout regulator with damping-factor-control frequency compensation , 2003, IEEE J. Solid State Circuits.

[4]  Shen-Iuan Liu,et al.  A Capacitor-free CMOS Low Dropout Regulator with Slew Rate Enhancement , 2006, 2006 International Symposium on VLSI Design, Automation and Test.

[5]  Ka Nang Leung,et al.  Development of Single-Transistor-Control LDO Based on Flipped Voltage Follower for SoC , 2008, IEEE Transactions on Circuits and Systems I: Regular Papers.

[6]  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.

[7]  Chern-Lin Chen,et al.  A CMOS low dropout regulator stable with any load capacitor , 2004, 2004 IEEE Region 10 Conference TENCON 2004..

[8]  Hoi Lee,et al.  Active-feedback frequency-compensation technique for low-power multistage amplifiers , 2003, IEEE J. Solid State Circuits.

[9]  Hoi Lee,et al.  Advances in active-feedback frequency compensation with power optimization and transient improvement , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[10]  H. Eul.  ICs for mobile multimedia communications , 2006, 2006 IEEE International Solid State Circuits Conference - Digest of Technical Papers.

[11]  D. Evans,et al.  SoC integration challenges for a power management/analog baseband IC for 3G wireless chipsets , 2004, 2004 Proceedings of the 16th International Symposium on Power Semiconductor Devices and ICs.

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

[13]  G.A. Rincon-Mora,et al.  Active capacitor multiplier in Miller-compensated circuits , 2000, IEEE Journal of Solid-State Circuits.

[14]  Edgar Sánchez-Sinencio,et al.  Full On-Chip CMOS Low-Dropout Voltage Regulator , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.