A 3.6-μW sub-lV fast-transient-response output-capacitor-free LDO regulator in 0.13-μm CMOS technology

A sub-1V output capacitor-free CMOS low-dropout regulator, which can realize fast transient behavior with low power dissipation, is presented in this paper. The proposed LDO regulator utilizes class AB operational amplifier to increase the slew rate at the gate of power PMOS transistor during transient state. An extra slew rate enhancement circuit is adopted to deliver extra current when the output voltage increases suddenly with automatic shut-off property. The proposed LDO regulator has been designed and simulated in a standard 0.13-μm CMOS process. The LDO regulator can deliver 100mA load current at 0.9V input voltage with 200mV dropout voltage. The output voltage is able to recover within 1.6μs at 4 μA quiescent current, when the output current steps from 50μA to 100mA.

[1]  Tsz Yin Man,et al.  A High Slew-Rate Push–Pull Output Amplifier for Low-Quiescent Current Low-Dropout Regulators With Transient-Response Improvement , 2007, IEEE Transactions on Circuits and Systems II: Express Briefs.

[2]  Philip K. T. Mok,et al.  A Capacitor-Less CMOS Active Feedback Low-Dropout Regulator With Slew-Rate Enhancement for Portable On-Chip Application , 2010, IEEE Transactions on Circuits and Systems II: Express Briefs.

[3]  Marco Ho,et al.  Dynamic Bias-Current Boosting Technique for Ultralow-Power Low-Dropout Regulator in Biomedical Applications , 2011, IEEE Transactions on Circuits and Systems II: Express Briefs.

[4]  A.J. Lopez-Martin,et al.  Low-Voltage Super class AB CMOS OTA cells with very high slew rate and power efficiency , 2005, IEEE Journal of Solid-State Circuits.

[5]  Qiang Li,et al.  An Ultrafast Adaptively Biased Capacitorless LDO With Dynamic Charging Control , 2012, IEEE Transactions on Circuits and Systems II: Express Briefs.

[6]  Pui Ying Or,et al.  An Output-Capacitorless Low-Dropout Regulator With Direct Voltage-Spike Detection , 2010, IEEE Journal of Solid-State Circuits.

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

[8]  Hoi Lee,et al.  Design of low-power analog drivers based on slew-rate enhancement circuits for CMOS low-dropout regulators , 2005, IEEE Transactions on Circuits and Systems II: Express Briefs.

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