An NMOS low dropout voltage regulator with switched floating capacitor gate overdrive

This paper presents a 1.5 V 50 mA low dropout voltage (LDO) regulator using an NMOS transistor as the output pass element. Continuous time operation of the LDO is achieved using a new switched floating capacitor scheme that raises the gate voltage of the pass element. The regulator has a 0.1 V dropout at a 50 mA load and is stable for a wide load current range with loading capacitances up to 100 pF. The output variation when a full load step is applied is 35 mV and the recovery time is below 0.6 µs. It is designed in a 0.13 µm CMOS process with an area of 0.018 mm2 and does not require any external component.

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

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

[3]  Francesco Pulvirenti,et al.  Low supply voltage, low quiescent current, ULDO linear regulator , 2001, ICECS 2001. 8th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.01EX483).

[4]  Gaetano Palumbo,et al.  NMOS Low Drop-Out Regulator with Dynamic Biasing , 2006, 2006 13th IEEE International Conference on Electronics, Circuits and Systems.

[5]  D.D. Buss.  Technology in the Internet age , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[6]  W. Kruiskamp,et al.  Low drop-out voltage regulator with full on-chip capacitance for slot-based operation , 2008, ESSCIRC 2008 - 34th European Solid-State Circuits Conference.

[7]  E.J. Brauer,et al.  Performance evaluation of CMOS low drop-out voltage regulators , 2004, The 2004 47th Midwest Symposium on Circuits and Systems, 2004. MWSCAS '04..

[8]  F. Rodes,et al.  4 V, 5 mA low drop-out regulator using series-pass n-channel MOSFET , 1999 .

[9]  Juha Kostamovaara,et al.  A Capacitor-Free CMOS Low-Dropout Regulator , 2007, 2007 IEEE International Symposium on Circuits and Systems.

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