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A Low-dropout Regulator with Unconditional Stability and Low Quiescent Current
Abstract An unconditionally stable low-dropout
regulator (LDO) with ultra low quiescent current is presented.
By using frequency compensation of dynamic miller on the
LDO's structure, the proposed LDO's stability is independent
of the load or off-chip capacitor. The LDO works at a low
quiescent current of approximately 4pA. Low quiescent
current is due to a precision CMOS current reference, which
operates in subthreshold region and generates 3OnA bias
current. The current reference has max-to-min fluctuation of
less than 2.5% over a temperature range of -40°C to 150°C.
The proposed LDO has been implemented in a 0.5-jm CMOS
technology. The experimental results revealed that the LDO
provides a full load transient response of less than 50Os setting
time and less than 75mV overshoots and undershoots.
Moreover, the dropout voltage is 170mV at 150mA loading,
and quiescent current is 4.17pA when output current is
150mA. |
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发表于 2009-12-4 10:09:11
