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LOW DROPOUT VOLTAGE REGULATOR WITH HIGH STABILITY OUTPUT CURRENT LIMIT CIRCUIT

IP.com Disclosure Number: IPCOM000008821D
Original Publication Date: 2002-Jul-16
Included in the Prior Art Database: 2002-Jul-16

Publishing Venue

Motorola

Related People

Inventors:
Gary Pace Kai Zhong

Abstract

A cellular phone handset requires a low dropout voltage regulator with a current limit function to prevent the IC from being destroyed under heavy load conditions or when the output is suddenly shorted to ground. The current limit circuit must not significantly affect the load regulation or stability of the regulator during normal operation, especially when the load current approaches the current limit. This paper describes a low dropout voltage regulator with a current limit feedback control loop that reacts quickly to protect the regulator from damage during overload conditions. The current limit circuit has minimal effect on regulator load regulation and provides high regulator stability prior to and following the application of excessive load currents.