MB3829

March 1998 Edition 1.0 DATA SHEET MB3829 DESCRIPTION System Power Supply IC for Mobile Telephone 48-PIN PLASTIC LQFP (FPT-48P-M05) This power supply IC incorporates a 4 - channel series regulator and a battery backup function. It is a multi - function power supply IC with an output control function and momentary power - loss detection circuit, which are both required for mobile telephones. It also incorporates a speaker amplifier and a buzzer driver. Since it has a built - in power system suitable for mobile telephones, it promises equipment downsizing. FEATURES Power consumption during standby 4 - channel low - saturation voltage type series regulator Battery backup function Momentary power - loss and power - restoration functions ON/OFF switch circuit with an operating error prevention function BTL amplifier for driving the speaker : Output power= 90 mW typ. Buzzer driver to permit changing the sound volume : 200 mA max. Power supply voltage drops are accurately detected. Hysteresis is provided for detection voltage. Watchdog timer stop function is provided (inhibit pin). Watchdog monitoring time and reset time are set independently. : 0.22 mW (typ.) : 6 W typ. for channels 1 - 3 20 W typ. for channel 4 This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields. However, it is advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circ...