HYBRID LDO REGULATOR WITH FINE LOOP PRESET

Abstract: a low dropout regulator with fine loop preset including a coarse resolution regulator and a fine resolution regulator. the coarse resolution regulator adjusts a digital control value in response to an output transient to control a coarse output driver to regulate an output voltage with coarse resolution. the coarse resolution regulator eventually enters a limit-cycle oscillation mode with a corresponding duty cycle. the fine resolution regulator is disabled when the digital control value initially changes, is preset based on the duty cycle of the digital control value when in the limit-cycle oscillation mode, and is re-enabled after being preset to drive at least one fine output driver to regulate the output voltage with fine resolution. the preset provides a closer estimate of the supplemental current needed to meet the output load level when turned on after an output load transient to achieve less output ripple voltage.

Inventor(s): Minwen Shi

CPC Classification: G05F1/563 (SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES (regulating the timing or recurrence frequency of pulses in radar or radio navigation systems ; regulation of current or voltage, specially adapted for use in electronic time-pieces ; closed-loop systems for regulating non-electric variables by electric means ; regulating power supply of digital computers ; for obtaining desired operating characteristics of electromagnets with armatures ; regulating electric power distribution networks ; regulating the charging of batteries ; regulation of the output of static converters, e.g. switching regulators ; regulation of the output of electric generators , ; controlling transformers, reactors or choke coils ; regulating frequency response, gain, maximum output, amplitude or bandwidth of amplifiers ; regulating tuning of resonant circuits ; regulating characteristics of transmission lines ; controlling electric light sources , , , , ; electric control of X-ray apparatus ))

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