March 1998 Edition 1.0 DATA SHEET
MB3829
DESCRIPTION
System Power Supply IC for Mobile Telephone
48-PIN PLASTIC LQFP (...
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...