Patent ID: 6377667
Filing Date: 2002-04-23
Classification: H04L,H04M

Abstract:
In a terminal interface device, a power management circuit for alternatively combining primary power available from a communication network with standby power available from a terminal device to provide a regulated output voltage for alternatively operating a data transfer portion circuitry and standby circuitry, said terminal interface device for operatively coupling said terminal device with said communication network, said primary power being available to said power management circuit when said terminal device and said communication network interact, said power management circuit comprising:a. a charge pump electrically coupled to said standby power of said terminal device for receiving said standby power and converting said standby power to a regulated output voltage; b. a shunt regulator electrically coupled to said regulated output voltage to regulate said regulated output voltage by shunting to ground excess current from said charge pump; c. a voltage regulator at least indirectly electrically coupled to said communication network to convert, when said voltage regulator is enabled, said primary power available from said communication network directly into regulated primary power which indirectly becomes said regulated output voltage; and d. a hold current generator electrically coupled between said regulated primary power of said voltage regulator and said regulated output voltage as controlled by said shunt regulator.