Fast transient current-steering CMOS LDO regulator based on current feedback amplifier
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This paper presents a current-steering approach to implement a fast transient response low-dropout regulator (LDO) based on a current feedback amplifier (CFA) topology. The circuit does not require any internal compensation capacitor, being stable for a wide range of output load currents [0–100 mA] and a 1 μF output capacitor. The CFA consists of an open-loop voltage follower with output local current–current feedback based on a level-shifted flipped voltage follower (LSFVF) which is instrumental to achieve high regulation and fast transient response. The inverting output buffer stage of the CFA together with current-mirror-based driving of the power pass transistor results in high PSRR. Post-layout simulation results for a 0.35 μm CMOS process design reveal that the proposed LDO requires 59 μA quiescent current at no-load condition and at full-load condition has a current efficiency of 99.8%. For a 1 μF output capacitor, the maximum output voltage variation to a 0–100 mA load transient with rise and fall times of 10 and 100 ns is only 3 mV, and the PSRR is smaller than −56 dB over the entire load current range.
CitationSaberkari, A.; Alarcon, E.; Shokouhi, S. Fast transient current-steering CMOS LDO regulator based on current feedback amplifier. "Integration. The VLSI journal", Març 2013, vol. 46, núm. 2, p. 165-171.
|1-s2.0-S0167926012000107-main.pdf||Fast transient current-steering CMOS LDO regulator based on current feedback amplifier||1.030Mb||Restricted access|