SYSTEMS AND METHODS FOR LOW-BATTERY OPERATION CONTROL IN PORTABLE COMMUNICATION DEVICES

• Main Authors: LEE CHANG-HO, YANG KI SEOK, HAN JEONGHU, KIM WOONYUN, CHANG JAEJOON
• Format: Patent
• Language: English
• Published: 02.08.2012
• Subjects: CONTROLLING; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

Systems and methods may include a low-dropout (LDO) voltage regulator for portable communication devices. The systems and methods may include a comparator having first and second inputs and generating a control voltage, the first input receiving a battery voltage from a battery source, the second input receiving a fixed voltage independent from the battery voltage, and a power management circuit that receives the control voltage and provides a regulated voltage based upon the control voltage, wherein when the received battery voltage is above the fixed voltage, the control voltage is provided at a high constant voltage, thereby resulting in the regulated voltage being at a first voltage, and wherein when the battery voltage is below the fixed voltage, the control voltage is provided at a low constant voltage, thereby resulting in the regulated voltage being at a second voltage less than the first voltage.