MODEM power supply circuit

Published:2011/6/19 2:49:00 Author:John | Keyword: power supply | From:SeekIC

Despite of MODEM, the system is powered by 3.0V power supply. Such takes the power requirements on the hardware system with small ripple and stable voltage regulating functions into accounts. It also considers the low power consumption of hardware system. So the power part of the hardware system uses TI's TPS76330 chip, whose output current is 150mA. The system can meet current requirements. Besides, the chip has a small footprint, which can effectively save PCB board’s space. Power supply circuit is as shown in the figure. To make the output power ripple be small, a 2.2μF and 0.1μF capacitors are set in the output section. Moreover, the other input end of the chip is also placed with a 0.1μF filter capacitor, thus reducing the disruption for the input end.



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