A high slew-rate amplifier with push-pull output driving capability is proposed to enable an ultra-low quiescent current ( 1 A) low-dropout (LDO) regulator with improved transient responses. The proposed amplifier eliminates the tradeoff between small and large slew-rate that is imposed by the tail-current in conventional amplifier design. Push-pull output stage is introduced to enhance the output driving ability. Small dropout voltage ( DO ) with large-size pass transistor and ultra-low can thus be used to minimize power loss of LDO regulator without transient-response degradation. The proposed amplifier helps to improve stability of LDO regulators without using any on-chip and off-chip compensation capacitors. This is beneficial to chip-level power management requiring high-area efficiency. An LDO regulator with the proposed amplifier has been implemented in a 0.18-m standard CMOS process and occupies 0.09 mm 2 . The LDO regulator can deliver 50-mA load current at 1-V input and 100-mV DO . It only consumes 1.2 A and is able to recover within 4 s even under the worst case scenario.Index Terms-High slew rate, low-dropout (LDO) regulator, low-quiescent current, tail current.
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