MB3829 Datasheet, PDF (1/24 Pages) Fujitsu Component Limited. – System Power Supply IC for Mobile Telephone

March 1998
Edition 1.0
DATA SHEET
MB3829
System Power Supply IC for Mobile Telephone
DESCRIPTION
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
: 0.22 mW (typ.)
4 - channel low - saturation voltage type : 6 W typ. for channels 1 - 3
series regulator
20 W typ. for channel 4
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.
48-PIN PLASTIC LQFP
(FPT-48P-M05)
ã ^{Copyright 1998 by FUJITSU LIMITED}
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 circuit.
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